CN116796581A - Method, device and medium for dividing fracturing layer sections of compact and huge-thickness sandstone reservoir - Google Patents

Abstract

The application discloses a method, a device and a medium for dividing a fracturing layer section of a compact and huge-thickness sandstone reservoir. According to the scheme disclosed by the application, a three-dimensional geological model and a rock mechanical parameter model of a target block can be established firstly, then a fracturing model is established based on the three-dimensional geological model and the rock mechanical parameter model, then a main control factor is screened out based on the influence of rock mechanical parameters on the high expansion of fracturing cracks, the fracturing intervals are initially divided based on the main control factor, and the fracturing intervals are further finely divided according to the simulation result of the fracturing model on the basis of the fracturing intervals obtained by the initial division, so that the fine and efficient division of the in-situ fracturing intervals of the sea-phase tight sandstone huge-thickness reservoir can be realized, the full transformation of the huge-thickness tight sandstone reservoir can be realized, the drilling and fracturing construction cost can be obviously reduced, and the recovery ratio and economic benefit of an oil-gas field are improved.

Description

Method, device and medium for dividing fracturing layer sections of compact and huge-thickness sandstone reservoir

Technical Field

The application belongs to the field of oil and gas field development, and particularly relates to a method, medium and device for dividing a tight and huge-thickness sandstone reservoir pressure interval.

Background

The interval division is an important factor influencing the fracturing reconstruction and development effects of the tight reservoir, and for the sea-phase huge-thickness sandstone with the thickness of more than 50m, the longitudinal geological engineering heterogeneity characteristics in the huge-thickness sandstone layer need to be fully known for realizing the reasonable division of the interval. By researching the sea-phase compact huge-thickness sandstone reservoir fracturing crack extension rule, the fact that under different engineering geological conditions, the fracturing crack morphology and the in-situ crack height extension have large difference is found, in-situ heterogeneity can have a remarkable influence on the crack height extension, and rock mechanics main control factors which influence the crack height extension such as in-situ stress difference and high stress section thickness are fully considered for interval division of compact huge-thickness heterogeneous sandstone. Thus, fine-dividing of the fracturing interval for sea-phase tight, ultra-thick sandstone reservoirs is important for reservoir development.

The application patent of the method for optimizing the layer system division and perforation scheme of the offshore thin interbed sandstone oil field (CN202011029613. X) quantitatively evaluates the longitudinal heterogeneous severity of the thin interbed sandstone oil field, establishes a quantitative prediction chart of the interlaminar interference coefficient of the thin interbed sandstone oil field, and optimizes the layer system division scheme by utilizing a corrected directional well energy formula, but does not consider the influence of the heterogeneity of longitudinal rock mechanical parameters on the high expansion of fracture in the layer system division, and the established method is not suitable for the division of fracture intervals in the thick-layer compact sandstone layer. The literature "layer system evaluation method based on sand body superposition and interlayer parameter difference" researches "selects interlayer variation coefficients of indexes such as boundary oil-containing area coverage, boundary oil-containing sand body superposition rate, oil-containing rate, saturation, seepage resistance and the like as layer system evaluation parameters, and evaluates and knows the layer system from the angles of quantization and grading, but does not consider the influence of engineering parameters on the layer fracturing construction and development effect of the tight sandstone, and does not give a layer interval division quantization evaluation criterion based on engineering factors. The literature 'south Sichuan block flat bridge back inclined shale gas development layer system division and reasonable well spacing optimization research' is based on reservoir fine description, focuses on describing rock microphase and stress characteristics in the longitudinal direction, defines influences on fracture height and fracture length, utilizes technical methods such as microseism monitoring and gas well production data history fitting to clearly develop layer system division, but does not give an in-layer fracture height expansion criterion and a layer section division method aiming at a huge thick reservoir. The literature CO2 flooding layer system combination optimization of the multi-thin-layer ultra-low permeability beach dam sand oil reservoir utilizes an oil reservoir numerical simulation method to analyze the influence of factors such as the oil reservoir permeability, the oil saturation, the oil layer thickness and the like on the layer system combination, and establishes the comprehensive effective fluidity taking the geological main control factors, the starting pressure gradient and the fracturing influence into consideration as the characterization index of the layer system combination, but does not develop research on the influence rule of the rock mechanical main control factors on the high expansion of the fracturing seam, and the proposed layering criterion is not suitable for the layer section division in the sea-phase huge-thickness tight sandstone layer. The literature 'study on the formation layer system division method for the imitation horizontal well development' defines formation layer system division standards during the imitation horizontal well development of the low-permeability oil reservoir by a numerical simulation method, optimizes and researches parameters such as permeability level difference, viscosity, formation flow coefficient level difference, small layer number, jet-open well section length and the like, but does not develop study on the influence of high expansion of fracture and post-pressure productivity on engineering factors, and is not suitable for the division of the sea-phase compact and huge-thickness sandstone layer sections.

In summary, although research on development and fracturing interval division is paid more and more attention, research on interval division in sea-phase ultra-thick tight sandstone layers is still blank, and research and development are needed. Therefore, aiming at the requirements of on-site development and reservoir transformation, a fine division scheme of the sea-phase compact and huge-thickness sandstone reservoir fracturing layer section is urgently needed to be designed, so that the fracturing transformation effect is improved to the greatest extent, and the recovery ratio and economic benefit of the sea-phase compact and huge-thickness sandstone reservoir are improved.

Disclosure of Invention

In view of the above, the embodiment of the application provides a method, a device, electronic equipment and a medium capable of finely dividing a compact and huge-thickness sandstone reservoir fracturing layer segment.

One aspect of the application provides a method for dividing a compact and huge-thickness sandstone reservoir fracturing layer segment, which comprises the following steps:

step S1, a fracturing three-dimensional geological model of a target block is established based on an overall geological model of a compact huge-thickness sandstone reservoir area, a typical horizontal well track of the block, the spreading characteristics of surrounding sand bodies and the fracturing construction requirements, wherein the target block is positioned in the compact huge-thickness sandstone reservoir area;

step S2, a rock mechanical parameter model of the target block is established according to the logging data, the geological data and the fracturing three-dimensional geological model of the target block;

step S3, a fracturing model is established based on the fracturing three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions;

step S4, based on the fracturing model, one or more parameters are selected from a plurality of rock mechanical parameters to be used as main control factors for influencing the high expansion of the fracturing fracture;

step S5, establishing a target block intra-layer fracture height expansion criterion, wherein the criterion is used for indicating the corresponding relation between the main control factor value range and the fracturing layer section;

step S6, based on the high expansion criterion of the fracturing cracks in the target block layer, primarily dividing fracturing intervals of the target block;

and S7, substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on a simulation result to obtain the fracturing intervals finally divided.

In some possible embodiments, the fractured three-dimensional geologic model includes in-situ porosity, permeability, water saturation, and natural fracture development.

In some possible embodiments, the step S1 further includes:

and analyzing the longitudinal heterogeneity of the compact giant thick sandstone reservoir region according to geological engineering data of the compact giant thick sandstone reservoir region to obtain the integral geological model.

In some possible embodiments, the rock mechanics parameter model includes a young's modulus model, a poisson's ratio model, a permeability model, a layer thickness model, a principal stress model including a minimum level principal stress model and a maximum level principal stress model.

In some possible embodiments, in step S2, establishing a principal stress model of the rock mechanics parameter model specifically includes:

obtaining or calculating Young modulus and Poisson's ratio from logging data and geological data of a target block;

interpolating the obtained Young modulus and Poisson's ratio by combining the geographic position, lithology and small layer contrast, and establishing a Young modulus model and a Poisson's ratio model of the target block;

selecting a main stress calculation model according to the rock type and the rock composition, substituting the Young modulus model and the Poisson ratio model into the main stress calculation model, and calculating the main stress distribution of the target block;

and adjusting the main stress distribution by combining the instantaneous pump stopping pressure and the closed stress test data, and establishing a main stress model of the target block.

In some possible embodiments, in step S4, the selected master factors include the spacer thickness and the minimum level principal stress.

In some possible embodiments, the step S7 specifically includes:

substituting the fracturing conditions into the fracturing model, and re-dividing the adjacent multiple fracturing intervals into one fracturing interval if the simulation result shows that the crack height is expanded to pass through the adjacent multiple fracturing intervals obtained by preliminary division;

if the simulation result shows that one fracturing layer segment obtained through preliminary division is not penetrated by the crack, the fracturing layer segment is divided into two fracturing layer segments again, wherein one fracturing layer segment is a part where the crack is expanded, and the other fracturing layer segment is a part where the crack is not expanded.

Another aspect of the present application provides an electronic device including:

a memory storing executable instructions;

a processor executing the executable instructions in the memory to implement the tight and ultra-thick sandstone reservoir fracturing interval partitioning method as described above.

Another aspect of the application provides a computer readable storage medium storing a computer program which when executed by a processor implements a method of dense giant-thickness sandstone reservoir fracturing interval partitioning as described above.

Another aspect of the application provides a tight ultra-thick sandstone reservoir fracturing layer segment partitioning device, comprising:

the three-dimensional geological model building module is used for building a fracturing three-dimensional geological model of a target block based on an overall geological model of a compact huge-thickness sandstone reservoir area, a block typical horizontal well track, surrounding sand spreading characteristics and fracturing construction requirements, wherein the target block is positioned in the compact huge-thickness sandstone reservoir area;

the rock mechanical parameter model building module is used for building a rock mechanical parameter model of the target block according to the logging data, the geological data and the three-dimensional geological model of the target block;

the fracturing model building module is used for building a fracturing model based on the three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions;

the main control factor screening module is used for screening one or more parameters from a plurality of rock mechanical parameters based on the fracturing model to be used as main control factors for influencing the high expansion of the fracturing fracture;

the intra-layer fracture high expansion criterion module is used for establishing an intra-layer fracture high expansion criterion of the target block, and the criterion is used for indicating the corresponding relation between the value range of the main control factors and the fracturing layer segments;

the fracturing layer section preliminary dividing module is used for preliminarily dividing the fracturing layer section of the target block based on the high expansion criterion of the fracturing crack in the target block layer;

the fracturing interval fine dividing module is used for substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on the simulation result to obtain the finally divided fracturing intervals

According to the scheme disclosed by the application, a three-dimensional geological model and a rock mechanical parameter model of a target block can be established firstly, then a fracturing model is established based on the three-dimensional geological model and the rock mechanical parameter model, then a main control factor is screened out based on the influence of rock mechanical parameters on the high expansion of fracturing cracks, the fracturing intervals are initially divided based on the main control factor, and the fracturing intervals are further finely divided according to the simulation result of the fracturing model on the basis of the fracturing intervals obtained by the initial division, so that the fine and efficient division of the in-situ fracturing intervals of the sea-phase tight sandstone huge-thickness reservoir can be realized, the full transformation of the huge-thickness tight sandstone reservoir can be realized, the drilling and fracturing construction cost can be obviously reduced, and the recovery ratio and economic benefit of an oil-gas field are improved.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

FIG. 1 shows a flow chart of a method of sea-phase tight giant thick sandstone reservoir interval partitioning, according to one embodiment of the present application.

FIG. 2 shows a schematic representation of a three-dimensional geologic model built according to an embodiment of the application.

FIG. 3 illustrates a schematic diagram of a minimum horizontal principal stress model established in accordance with an embodiment of the present application.

FIG. 4 illustrates a schematic diagram of a target ultra-thick tight sandstone layer seam height expansion criteria, according to one embodiment of the present application.

Detailed Description

Preferred embodiments of the present application will be described in more detail below. While the preferred embodiments of the present application are described below, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein.

Example 1

FIG. 1 shows a flow chart of a method of sea-phase tight giant thick sandstone reservoir interval partitioning, according to one embodiment of the present application. As shown, the method includes steps S1-S7.

Step S1, a fracturing three-dimensional geological model of a target block is established based on an overall geological model of a compact huge-thickness sandstone reservoir area, a typical horizontal well track of the block, the spreading characteristics of surrounding sand bodies and the fracturing construction requirements, and the target block is located in the compact huge-thickness sandstone reservoir area.

A geologic model is a three-dimensional body of grids that are based on surfaces, faults, and horizons. It determines the formation and geometry of the reservoir. Each node in the grid has a range of properties such as porosity, permeability, water saturation, and the like. The integral geologic model and the fracturing three-dimensional geologic model are three-dimensional geologic models.

The fracturing construction requirements generally comprise indicators such as horizontal segment length, fracturing fracture length and the like.

In one possible implementation, the overall geologic model may be derived from the geologic engineering data of the entire reservoir region, as analyzed for longitudinal heterogeneity. In one example, petrel software may be employed to generate the overall geologic model described above.

Heterogeneity generally refers to spatial inhomogeneities in parameters that characterize a reservoir, which are common characteristics of the reservoir. In developing reservoir evaluations, reservoir heterogeneity refers to a reservoir having dual heterogeneities, namely, heterogeneity of rock in which fluids are present and heterogeneity of fluid properties and formations present in the rock space, a variety of which are contemplated in the present application, including both heterogeneity of lithologic parameters and heterogeneity of geologic parameters.

According to the geological features reflected by the overall geological model, a representative block is selected from the compact huge-thickness sandstone reservoir area to serve as a target block, a local model corresponding to the target block is intercepted from the overall geological model, and a fracturing three-dimensional geological model of the target block is established by combining the typical horizontal well track of the block, the spreading features of surrounding sand bodies and the fracturing construction requirements. In one example, the fracturing three-dimensional geologic model described above may be generated using Petrel software.

The fracturing three-dimensional geological model established according to the application can comprise information such as in-situ porosity, permeability, water saturation, natural crack development and the like, and is very suitable for analyzing compact and huge-thickness sandstone.

And S2, establishing a rock mechanical parameter model of the target block according to the logging data, the geological data and the fracturing three-dimensional geological model of the target block.

In one example, fragman software may be used to build the rock mechanics parameter model.

In some possible embodiments, the rock mechanics parameter model includes a young's modulus model, a poisson's ratio model, a permeability model, a layer thickness model, a principal stress model, and the like. The principal stress model comprises a minimum horizontal principal stress model, a maximum horizontal principal stress model and the like.

The main stress model is established specifically by the following steps:

obtaining or calculating Young modulus and Poisson's ratio from logging data and geological data of a target block;

interpolating the obtained Young modulus and Poisson's ratio by combining the geographic position, lithology and small layer contrast, and establishing a Young modulus model and a Poisson's ratio model of the target block;

selecting a main stress calculation model according to rock types, rock components and the like, substituting the Young modulus model and the Poisson ratio model into the main stress calculation model, and calculating main stress distribution of the target block;

and adjusting the main stress distribution by combining the instantaneous pump stopping pressure and the closed stress test data, and establishing a main stress model of the target block.

And step S3, a fracturing model is established based on the fracturing three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions.

In one example, fragman software may be employed to build the fracturing model. The fracturing model can be seen as a complex of a pumping program, a fracturing three-dimensional geologic model and a rock mechanics parameter model. The input of the pumping program can be fracturing conditions, such as what type of fracturing fluid and propping agent are pumped in each time period, the dosage of the fracturing fluid and propping agent, the fracturing construction displacement and other parameters, and the output of the pumping program can be the fracture morphology. The pumping program needs to call a fracturing three-dimensional geological model and a rock mechanical parameter model when simulation is carried out.

And step S4, screening one or more parameters from a plurality of rock mechanical parameters based on the fracturing model to serve as main control factors for influencing the high expansion of the fracturing fracture.

In one example, for each parameter, the other parameters may be set to fixed values, and only the parameter is adjusted to observe the morphology of the generated crack, thereby evaluating the effect of the parameter on crack height expansion.

In one embodiment according to the application, the selected host factors include barrier thickness and minimum horizontal principal stress.

And S5, establishing a target block intra-layer fracture height expansion criterion, wherein the criterion is used for indicating the corresponding relation between the main control factor value range and the fracturing layer section.

For example, when the value range of the main control factor a is in the first range and the value of the main control factor B is in the second range, the main control factor a corresponds to the same fracturing interval; when the value range of the main control factor A is in the third range and the value of the main control factor B is in the fourth range, the main control factor A corresponds to another fracturing layer section.

And S6, primarily dividing the fracturing intervals of the target block based on the high propagation criterion of the fracturing cracks in the target block layer.

And the reservoir of the target block can be initially divided according to the target ultra-thick compact sandstone layer seam height expansion criterion to obtain a plurality of fracturing intervals.

And S7, substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on a simulation result to obtain the fracturing intervals finally divided.

In one example, the step S7 specifically includes:

substituting the fracturing conditions into the fracturing model, and re-dividing the adjacent multiple fracturing intervals into one fracturing interval if the simulation result shows that the crack height expansion penetrates through the adjacent multiple fracturing intervals obtained by preliminary division;

if the simulation result shows that one fracturing interval obtained through preliminary division is not penetrated by the crack, the fracturing interval is divided into two layers again, wherein one layer is a part where the crack is expanded, and the other layer is a part where the crack is not expanded.

Thereby realizing the fine division of fracturing intervals of compact and ultra-thick sandstone reservoirs, in particular to sea-phase compact and ultra-thick sandstone reservoirs.

In the embodiment, the fracturing three-dimensional geological model and the rock mechanical parameter model of the target block are established, the fracturing model is established based on the fracturing three-dimensional geological model and the rock mechanical parameter model, then the main control factors are screened out based on the influence of the rock mechanical parameters on the high expansion of the fracturing fracture, the fracturing intervals are primarily divided based on the main control factors, and the fracturing intervals are further finely divided according to the simulation result of the fracturing model on the basis of the primarily divided fracturing intervals, so that the fine and efficient division of the in-layer fracturing intervals of the tight sandstone huge thick reservoir can be realized, the full reconstruction of the huge thick tight sandstone reservoir can be realized, the drilling and fracturing construction cost can be remarkably reduced, and the recovery ratio and the economic benefit of an oil-gas field are improved.

Example 2

In-situ fine fracturing interval partitioning may be performed for a sea-phase tight sandstone megathick reservoir region of canada in accordance with embodiments of the present application, as follows.

Firstly, geological engineering data can be collected, the thickness of the reservoir of the block is up to 162 m, the depth range is 2680m-2842m, the content of the argillaceous matter from top to bottom is increased, the porosity is less than 5%, the permeability is 0.003-0.005md, the reservoir is compact, and the reservoir seam is arranged and developed within the depth range of 2804m-2842 m. Based on geological engineering parameters, an integral geological model is established, the fracturing scale is considered, and a three-dimensional geological model of the target block is established according to typical horizontal well tracks of each layer and the spreading condition of surrounding rock masses. FIG. 2 shows a schematic representation of a fractured three-dimensional geologic model constructed according to one embodiment of the application.

And then, carrying out calculation and explanation on rock mechanical parameters (such as longitudinal Young modulus, poisson ratio and the like of each well) by adopting horizontal well logging data, carrying out region interpolation by combining rock facies and small layer comparison and division, optimizing a main stress calculation model, simulating the stress field distribution characteristics of a target block, and correcting the ground stress by combining instantaneous pump stopping pressure and closed stress test data. Fig. 3 shows a schematic diagram of a minimum horizontal principal stress model in the present embodiment.

And researching the influence rule of each rock mechanical parameter on the high expansion of the fracture. And screening to determine a main control factor influencing the high expansion of the fracture as the minimum level main stress, comprehensively considering the thickness of the high-stress reservoir, and establishing a high expansion criterion aiming at the fracture in the target land block. Fig. 4 shows a schematic diagram of a target block intra-layer fracture high propagation criterion according to an embodiment of the present application.

Based on a target zone fracture high expansion criterion, combining a fracture expansion form simulation result, finely dividing a target sea-phase tight sandstone huge thick reservoir into 3 fracturing layers, wherein the first layer depth range is 2680-2760m, the second layer depth range is 2760-2804m, and the third layer depth range is 2804-2842m.

Example 3

An electronic device according to an embodiment of the application includes a memory and a processor.

The memory is for storing non-transitory computer readable instructions. In particular, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like.

The processor may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities, and may control other components in the electronic device to perform the desired functions. In one embodiment of the application, the processor is configured to execute executable instructions stored in the memory to implement the tight and ultra-thick sandstone reservoir interval partitioning method described above.

It should be understood by those skilled in the art that, in order to solve the technical problem of how to obtain a good user experience effect, the present embodiment may also include well-known structures such as a communication bus, an interface, and the like, and these well-known structures are also included in the protection scope of the present application.

The detailed description of the present embodiment may refer to the corresponding description in the foregoing embodiments, and will not be repeated herein.

Example 4

A computer-readable storage medium according to an embodiment of the present application has a computer program stored thereon. The computer program when executed by a processor implements the method of compact giant thick sandstone reservoir interval partitioning.

The computer-readable storage medium described above includes, but is not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

Example 5

The device for dividing the fracturing intervals of the compact and huge-thickness sandstone reservoir comprises a three-dimensional geological model building module, a rock mechanical parameter model building module, a fracturing model building module, a main control factor screening module, an internal seam height expansion criterion module, a fracturing interval preliminary dividing module and a fracturing interval fine dividing module.

The three-dimensional geological model building module is used for building a fracturing three-dimensional geological model of a target block based on an overall geological model of a compact huge-thickness sandstone reservoir area, a typical horizontal well track of the block, the spreading characteristics of surrounding sand bodies and fracturing construction requirements, wherein the target block is located in the compact huge-thickness sandstone reservoir area.

And the rock mechanical parameter model building module is used for building the rock mechanical parameter model of the target block according to the logging data, the geological data and the three-dimensional geological model of the target block.

The fracturing model building module is used for building a fracturing model based on the three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions.

And the main control factor screening module is used for screening one or more parameters from a plurality of rock mechanical parameters based on the fracturing model to serve as main control factors for influencing the high expansion of the fracturing fracture.

And the in-layer fracture high expansion criterion module is used for establishing an in-layer fracture high expansion criterion of the target block, and the criterion is used for indicating the corresponding relation between the value range of the main control factors and the fracturing layer segments.

And the fracturing layer section preliminary dividing module is used for preliminarily dividing the fracturing layer section of the target block based on the high expansion criterion of the fracturing crack in the target block layer.

And the fracturing interval fine dividing module is used for substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on the simulation result to obtain the finally divided fracturing intervals.

The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims (10)

1. A method for dividing a fracture interval of a tight and ultra-thick sandstone reservoir, comprising:

step S1, a fracturing three-dimensional geological model of a target block is established based on an overall geological model of a compact huge-thickness sandstone reservoir area, a typical horizontal well track of the block, the spreading characteristics of surrounding sand bodies and the fracturing construction requirements, wherein the target block is positioned in the compact huge-thickness sandstone reservoir area;

step S2, a rock mechanical parameter model of the target block is established according to the logging data, the geological data and the fracturing three-dimensional geological model of the target block;

step S3, a fracturing model is established based on the fracturing three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions;

step S4, based on the fracturing model, one or more parameters are selected from a plurality of rock mechanical parameters to be used as main control factors for influencing the high expansion of the fracturing fracture;

step S5, establishing a target block intra-layer fracture height expansion criterion, wherein the criterion is used for indicating the corresponding relation between the main control factor value range and the fracturing layer section;

step S6, based on the high expansion criterion of the fracturing cracks in the target block layer, primarily dividing fracturing intervals of the target block;

and S7, substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on a simulation result to obtain the fracturing intervals finally divided.

2. The method of claim 1, wherein the fractured three-dimensional geologic model comprises in-situ porosity, permeability, water saturation, and natural fracture development.

3. The method according to claim 1, wherein the step S1 further comprises:

and analyzing the longitudinal heterogeneity of the compact giant thick sandstone reservoir region according to geological engineering data of the compact giant thick sandstone reservoir region to obtain the integral geological model.

4. The method of claim 1, wherein the rock mechanical parameter model comprises a young's modulus model, a poisson's ratio model, a permeability model, a layer thickness model, a principal stress model comprising a minimum level principal stress model, a maximum level principal stress model.

5. The method according to claim 4, wherein in step S2, the establishing of the principal stress model in the rock mechanics parameter model specifically comprises:

obtaining or calculating Young modulus and Poisson's ratio from logging data and geological data of a target block;

interpolating the obtained Young modulus and Poisson's ratio by combining the geographic position, lithology and small layer contrast, and establishing a Young modulus model and a Poisson's ratio model of the target block;

selecting a main stress calculation model according to the rock type and the rock composition, substituting the Young modulus model and the Poisson ratio model into the main stress calculation model, and calculating the main stress distribution of the target block;

and adjusting the main stress distribution by combining the instantaneous pump stopping pressure and the closed stress test data, and establishing a main stress model of the target block.

6. The method of claim 4, wherein in step S4, the selected master factors include barrier thickness and minimum level principal stress.

7. The method according to claim 1, wherein the step S7 specifically includes:

substituting the fracturing conditions into the fracturing model, and re-dividing the adjacent multiple fracturing intervals into one fracturing interval if the simulation result shows that the crack height is expanded to pass through the adjacent multiple fracturing intervals obtained by preliminary division;

if the simulation result shows that one fracturing layer segment obtained through preliminary division is not penetrated by the crack, the fracturing layer segment is divided into two fracturing layer segments again, wherein one fracturing layer segment is a part where the crack is expanded, and the other fracturing layer segment is a part where the crack is not expanded.

8. An electronic device, the electronic device comprising:

a memory storing executable instructions;

a processor executing the executable instructions in the memory to implement the tight megathickness sandstone reservoir interval partitioning method of any of claims 1 to 7.

9. A computer readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the compact giant thick sandstone reservoir fracturing layer segment partitioning method of any one of claims 1 to 7.

10. A tight ultra-thick sandstone reservoir fracturing interval partitioning device, comprising:

the three-dimensional geological model building module is used for building a fracturing three-dimensional geological model of a target block based on an overall geological model of a compact huge-thickness sandstone reservoir area, a block typical horizontal well track, surrounding sand spreading characteristics and fracturing construction requirements, wherein the target block is positioned in the compact huge-thickness sandstone reservoir area;

the rock mechanical parameter model building module is used for building a rock mechanical parameter model of the target block according to the logging data, the geological data and the three-dimensional geological model of the target block;

the fracturing model building module is used for building a fracturing model based on the three-dimensional geological model and the rock mechanical parameter model, and the fracturing model is used for simulating the crack morphology formed by the expansion of the target block under different fracturing conditions;

the main control factor screening module is used for screening one or more parameters from a plurality of rock mechanical parameters based on the fracturing model to be used as main control factors for influencing the high expansion of the fracturing fracture;

the intra-layer fracture high expansion criterion module is used for establishing an intra-layer fracture high expansion criterion of the target block, and the criterion is used for indicating the corresponding relation between the value range of the main control factors and the fracturing layer segments;

the fracturing layer section preliminary dividing module is used for preliminarily dividing the fracturing layer section of the target block based on the high expansion criterion of the fracturing crack in the target block layer;

and the fracturing interval fine dividing module is used for substituting the fracturing conditions into the fracturing model to simulate, and adjusting the fracturing intervals obtained by preliminary division based on the simulation result to obtain the finally divided fracturing intervals.