CN107505661B - A kind of three detector elements well logging apparatus of controllable neutron and method - Google Patents
A kind of three detector elements well logging apparatus of controllable neutron and method Download PDFInfo
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- CN107505661B CN107505661B CN201710608789.2A CN201710608789A CN107505661B CN 107505661 B CN107505661 B CN 107505661B CN 201710608789 A CN201710608789 A CN 201710608789A CN 107505661 B CN107505661 B CN 107505661B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000470 constituent Substances 0.000 claims abstract description 40
- 238000001228 spectrum Methods 0.000 claims abstract description 38
- 229910014323 Lanthanum(III) bromide Inorganic materials 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000001730 gamma-ray spectroscopy Methods 0.000 claims abstract description 8
- 210000002445 nipple Anatomy 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- XKUYOJZZLGFZTC-UHFFFAOYSA-K lanthanum(iii) bromide Chemical compound Br[La](Br)Br XKUYOJZZLGFZTC-UHFFFAOYSA-K 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000005755 formation reaction Methods 0.000 description 13
- 230000005251 gamma ray Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000019 calcium carbonate Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001637516 Polygonia c-album Species 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910001748 carbonate mineral Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052592 oxide mineral Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/14—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using a combination of several sources, e.g. a neutron and a gamma source
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- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Radiation (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a kind of controllable three detector elements well logging apparatus of neutron and methods, and in particular to petroleum and natural gas Exploration Domain.The device uses D-T controllable neutron source, nearly He-3 neutron detector, a LaBr3Crystal gamma detector and a super remote He-3 thermal-neutron detector.Two He-3 neutron detector acquisition neutron time spectrums and neutron tale, LaBr3Gamma detector acquires non-ballistic and capture gamma time spectrum, metrical information pass through instrument telemetering pipe nipple, uploads ground installation.This method comprises: handle first non-ballistic gamma spectra, the non-ballistic gamma yield of calculating elements, in conjunction with element non-ballistic yield, closely with the information such as super remote neutron counting ratio, the elements dry weights such as Si, C are calculated；Then the capture yield of processing capture gamma spectra calculating elements, the constituent content determined in conjunction with non-ballistic gamma and capture yield, calculate the content that can be captured element such as Ca, S, Fe of gamma spectrometry.
Description
Technical field
The present invention relates to petroleum and natural gas Exploration Domains, and in particular to a kind of controllable three detector elements of neutron well logging dress
It sets and method.
Background technique
It is representative mainly to have at present there are many determination that logging method and device are able to carry out down-hole formation constituent content
The ECS (Elemental Capture Spectroscopy) of Schlumberger, Halliburton Company GEM (Geochemical
Logging), the FLeX (Formation Lithology eXplorer) of the Baker Hughes Inc and Litho of Schlumberger
Scanner geochemical well logging instrument.Wherein ECS and GEM uses Am-Be isotope neutron source and single BGO gamma detector.
FLeX and Litho Scanner have used D-T controllable neutron source, and wherein the former uses BGO gamma detector, and the latter uses
High-resolution LaBr3Gamma detector.The neutron source given-ioff neutron of instrument enters wellbore and stratum, when neutron energy is higher,
Inelastic scattering can occur with ambient substance, discharge non-ballistic characteristic gamma ray；With the continuous deceleration of neutron, gradually become
Thermal neutron releases capture characteristic gamma ray finally by the material absorbing of surrounding equipment.Instrument is measured using gamma detector
Gamma spectra, and then analyze stratum backbone element composition.Since the average energy of Am-Be neutron source release neutron is relatively low, neutron
Radiation capture effect mainly occurs with element atomic nucleus, therefore ECS and GEM carries out constituent content merely with capture gamma spectra
Measurement.The energy of D-T controllable neutron source given-ioff neutron is about 14MeV, and neutron and substance occur inelastically scattered probability and increase
Greatly, FLeX and Litho Scanner is by specific impulse ejection and information collection timing, by measurement inelastic scattering and
Gamma spectra is captured, and then analyzes the element composition of formation skeleton.
Instrument (US5471057, CN103696765, US20110218735, CN102084271) determines constituent content at present
When, the capture gamma spectra of measurement is parsed first, determines the capture yield of different elements；Then pass through oxides closure
Element capture yield is converted to element dry weight by model.Element is captured conversion of the yield to element dry weight and can be indicated are as follows:
In formula: F is the normalization factor with change in depth, YiYield, S are captured for elementiFor element measurement sensitivity because
Son, XiFor oxidation index, constituent content is converted to the content of corresponding oxide or carbonate mineral, and (such as Ca element may
It can be with CaO or CaCO3Form exist.When for CaCO3When, corresponding oxide index are 2.5, right in the presence of in the form of CaO
1.4) answering oxide index is.As can be seen that element may be present in stratum in the form of many oxide, therefore oxide
Type selection inaccuracy, can be such that calculating elements content error increases.
When non-ballistic gamma spectra determines constituent content (US 73666152B2), gamma can be captured simultaneously by needing to utilize
The element (such as Si element) of power spectrum and non-ballistic gamma spectrometry is transmitted.And then determine that other can be by non-ballistic gamma spectra
The constituent content of measurement.Determine that constituent content is required dependent on oxides closure mould using capture gamma or non-ballistic gamma spectra
Type, therefore the accuracy in computation of constituent content is influenced by element oxide specific diversity.
Patent No. US7366615 (04/2008), US5471057 (11/1995), US20110218735 (09/2011)
United States Patent (USP), Patent No. CN103696765 (11/2013), CN102084271 (06/2009), CN102518431 (06/
2012) Chinese patent.
Zheng Hua etc.PNST-E pulsed neutron formation element logging technology research " logging technique " .2015, volume 39 the (the 4th
Phase)
Geochemical well logging development course and technique prospects " Advances in Geophysics " of the superfine of Yuan based on gamma spectra
.2014, volume 29 (the 4th phase)
Liu Juntao etc. shale gas-bearing formation pulsed neutron geochemical well logging Monte Carlo study " logging technique " .2015, volume 39
(volume 5).
Above-mentioned patent or document describe existing some utilization capture gammas or non-ballistic gamma spectra determines constituent content
Method, but need by means of oxides closure model, therefore the accuracy in computation of constituent content is by element oxide species
Multifarious influence.
Invention describes a kind of constituent contents of metrical information based on three detectors to determine method and device.Pass through benefit
With the combination of three detector measurement information, directly determining for constituent content is realized, overcome constituent content meter to a certain extent
Calculate the dependence to oxides closure model.
Summary of the invention
The purpose of the present invention is determine that constituent content requires using capture gamma or non-ballistic gamma spectra for existing
By means of oxides closure model, the deficiency that the accuracy in computation of constituent content is influenced by element oxide specific diversity,
A kind of combination using three detector measurement information is proposed, directly determining for constituent content is realized, overcomes to a certain extent
Constituent content calculates the three detector elements well logging apparatus of controllable neutron and method of the dependence to oxides closure model.
The present invention specifically adopts the following technical scheme that
A kind of three detector elements well logging apparatus of controllable neutron, which is characterized in that including tubular shell, the tubular shell
It is inside provided with D-T controllable neutron source, nearly He-3 thermal-neutron detector, LaBr from top to bottom3Gamma detector, photomultiplier tube,
Super remote He-3 thermal-neutron detector and telemetering pipe nipple, nearly He-3 thermal-neutron detector and LaBr3Tungsten is equipped between gamma detector
Shielding material, LaBr3The outside of gamma detector is equipped with high capture boron material, and telemetering pipe nipple carries out signal demodulation to metrical information
And after processing, it is uploaded to ground control and information acquisition system.
A kind of three detector elements logging method of controllable neutron is surveyed using controllable three detector elements of neutron as described above
Well device, comprising the following steps:
(1) nearly He-3 thermal-neutron detector, super remote He-3 thermal-neutron detector acquire thermal neutron time spectrum and total respectively
Number, LaBr3Gamma detector measures non-ballistic and capture gamma spectra；
(2) first processing LaBr3The non-ballistic gamma spectra of gamma detector measurement, the non-ballistic gamma that element is calculated produce
Volume；
(3) the non-ballistic gamma yield based on element, when formation bulk density, calculating can be non-for closely super remote neutron counting
Play the content of element such as Si, C of gamma spectrometry；
(4) LaBr is handled3The capture gamma spectra of gamma detector measurement, is calculated the capture gamma yield of element；
(5) constituent content and capture gamma yield, calculating determined using non-ballistic gamma can be captured gamma spectra survey
The content of the element of amount such as Ca, S, Fe；
In above-mentioned steps (3), the specific calculating process of constituent content are as follows:
wI,Si=(exp (a1+a2·ρ)·(a3·RN+a4)+a5)·YI, Si (1)
Wherein, wI,SiFor Si constituent content, YI,SiFor Si element non-ballistic gamma yield；ρ is formation bulk density, Ke Yitong
Logging Curves are crossed to obtain；a1、a2、a3、a4And a5For fitting coefficient；RNRemote sub-count ratio is hankered to be closely super；
In above-mentioned steps (5), the specific process is as follows:
Wherein, wc,jFor the constituent content determined using capture gamma spectra, Yc,jIt is produced for the capture gamma of element to be calculated
Volume, Yc,SiFor the capture gamma yield of Si element, Sc,jFor the capture measurement sensitivity factor of element, Sc,SiFor the capture of Si element
The measurement sensitivity factor
Have the advantages that: invention is emitted using controllable D-T controllable neutron source, a LaBr3Gamma detector and two
A He-3 thermal-neutron detector, while measuring non-ballistic gamma, capture gamma and hankering sub-information, it proposes first with non-ballistic gal
The method that horse yield is combined with middle sub-information is determined to by the constituent content of non-ballistic gamma spectrometry；Then in conjunction with non-ballistic
Gamma determines constituent content and element capture yield, calculates the content that can be captured the element of gamma spectrometry.It overcomes
To the dependence of oxides closure model in constituent content calculating process, the application range of geochemical well logging technology, while energy have been widened
Enough realize once is gone into the well, while determining a variety of property parameters of reservoir.
Detailed description of the invention
Fig. 1 is controllable three detector elements well logging apparatus principle schematic diagram of neutron；
Fig. 2 determines flow diagram for the constituent content based on three detector measurement information；
Fig. 3 be utilize present invention determine that Different Strata under the conditions of Si element dry weight and actual comparison.
Wherein, 1 is D-T controllable neutron source, and 2 be nearly He-3 thermal-neutron detector, and 3 be tungsten shielding material, and 4 be LaBr3Gal
Horse detector, 5 be high capture boron material, and 6 be photomultiplier tube, and 7 be super remote He-3 thermal-neutron detector, and 8 be telemetering pipe nipple, 9
It is wellbore for stratum, 10,11 be cable.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
As shown in Figure 1, a kind of three detector elements well logging apparatus of controllable neutron, the device are generally connected in wellbore 10
Continuous depth measurement is typically filled with mud in wellbore, is stratum 9, including tubular shell around wellbore, in the tubular shell from
Under to being above provided with D-T controllable neutron source 1, nearly He-3 thermal-neutron detector 2, LaBr3Gamma detector 4, photomultiplier tube 6,
Super remote He-3 thermal-neutron detector 7 and telemetering pipe nipple 8, nearly He-3 thermal-neutron detector 2 and LaBr3It is set between gamma detector 4
There is tungsten shielding material 3, LaBr3The outside of gamma detector 4 is equipped with high capture boron material 5, and telemetering pipe nipple 8 carries out metrical information
After signal demodulation and processing, ground control and information acquisition system are uploaded to eventually by cable 11.
Wherein, the average energy of D-T controllable neutron source given-ioff neutron is about 14MeV.
LaBr3The energy resolution of gamma detector is 3%, (the 0.662MeV gamma ray of opposite Cs-137).
Fill He-3 gas inside nearly He-3 thermal-neutron detector and super remote He-3 thermal-neutron detector, by neutron with
The effect of He-3 gas generates secondary charged particle, realizes the measurement of thermal neutron.
As shown in 21 parts in Fig. 2, a kind of controllable three detector elements logging method of neutron, using as described above controllable
Three detector elements well logging apparatus of neutron, comprising the following steps:
(1) nearly He-3 thermal-neutron detector, super remote He-3 thermal-neutron detector acquire thermal neutron time spectrum and total respectively
Number, LaBr3Gamma detector measures non-ballistic and capture gamma spectra；
(2) first processing LaBr3The non-ballistic gamma spectra of gamma detector measurement, the non-ballistic gamma that element is calculated produce
Volume；
(3) the non-ballistic gamma yield based on element, when formation bulk density, calculating can be non-for closely super remote neutron counting
Play the content of element such as Si, C of gamma spectrometry；
(4) LaBr is handled3The capture gamma spectra of gamma detector measurement, is calculated the capture gamma yield of element；
(5) constituent content and capture gamma yield, calculating determined using non-ballistic gamma can be captured gamma spectra survey
The content of the element of amount such as Ca, S, Fe；
In above-mentioned steps (3), the specific calculating process of constituent content are as follows:
wI,Si=(exp (a1+a2·ρ)·(a3·RN+a4)+a5)·YI, Si(1)
Wherein, wI,SiFor Si constituent content, YI,SiFor Si element non-ballistic gamma yield；ρ is formation bulk density, Ke Yitong
Logging Curves are crossed to obtain；a1、a2、a3、a4And a5For fitting coefficient；RNRemote sub-count ratio is hankered to be closely super.
In step (5), the specific process is as follows:
Wherein, wc,jFor the constituent content determined using capture gamma spectra, Yc,jIt is produced for the capture gamma of element to be calculated
Volume, Yc,SiFor the capture gamma yield of Si element, Sc,jThe measurement sensitivity factor, S are obtained for elementc,SiFor the capture measurement of Si element
Sensitivity factor.
First to LaBr3The non-ballistic gal of stratum element is calculated in the non-ballistic gamma place of progress that gamma detector collects
Horse yield YI.Since the inelastic scattering cross section of different elements is different, only with the element pair of larger inelastic scattering cross section
Measurement non-ballistic gamma spectra contributes, such as C, O, Si, Ca element.Then hankered using close, super remote thermal-neutron detector measurement
Sub-count calculates and close super remote hankers sub-count ratio RN.Finally, using Si element non-ballistic gamma yield, hankering as shown in 22 in figure
Sub-count when density of earth formations, determines Si element dry weight wI,Si。
wI,Si=(exp (a1+a2·ρ)·(a3·RN+a4)+a5)·YI, Si (1)
In formula, YI,SiFor Si element non-ballistic gamma yield；ρ is formation bulk density, can be obtained by Logging Curves
It arrives；a1、a2、a3、a4And a5For fitting coefficient.
After determining Si element dry weight using non-ballistic gamma spectra, it is same to can use formula (3) (US 7366615) calculating
Other constituent contents that can be determined using non-ballistic gamma ray of depth point.
In formula: wI,jTo can use the elements such as non-ballistic gamma ray determining other elements such as C, Mg, SI,jFor element
Non-ballistic sensitivity factor, YjFor the non-ballistic gamma yield of element.
Si element generates capture gamma ray and also contributes the Si constituent content phase determined for the two to capture gamma spectra
Deng:
Therefore the normalization factor F of capture gamma spectra can be calculatedc:
Can further calculate can be by the dry of the element (such as Ca, S, Fe, Ti element) of capture gamma spectrometry
Weight wc,j:
In formula: Yc,jFor the capture gamma yield of element, Sc,jFor capture measurement sensitivity factor.
As shown in figure 3, using the present invention, processing formation skeleton is quartzy, illite and chlorite Different porosities respectively
The non-ballistic and capture gamma spectra on stratum, calculate Si constituent content and actual comparison.Si constituent content calculated result is fallen substantially
On the diagram on 45 degree of lines, illustrate that calculating Si constituent content and actual value has identical property well.
It is utilized respectively the present invention and current geochemical well logging processing method (based on oxide model, carries out constituent content and turns
Change), processing formation skeleton group becomes SiO2、Al2O3, MgO and FeO non-ballistic and capture gamma spectra, calculating elements content results
Comparison is as shown in table 1.
Table 1
As can be seen from Table 1, when oxide type selects inaccuracy, calculating elements content bigger error；Utilize this hair
Bright calculating elements content results and the identical property of actual value are more preferable.
Wherein, the above-mentioned non-a brief period of time being related to is non-resilient.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (1)
1. the three detector elements well logging apparatus of controllable neutron of a kind of three detector elements logging method of controllable neutron, use includes
Tubular shell is provided with D-T controllable neutron source, nearly He-3 thermal-neutron detector, LaBr in the tubular shell from top to bottom3Gal
Horse detector, photomultiplier tube, super remote He-3 thermal-neutron detector and telemetering pipe nipple, nearly He-3 thermal-neutron detector and LaBr3
Tungsten shielding material, LaBr are equipped between gamma detector3The outside of gamma detector is equipped with high capture boron material, telemetering pipe nipple pair
After metrical information carries out signal demodulation and processing, it is uploaded to ground control and information acquisition system, which is characterized in that including following
Step:
(1) nearly He-3 thermal-neutron detector, super remote He-3 thermal-neutron detector acquire thermal neutron time spectrum and tale respectively,
LaBr3Gamma detector measures non-ballistic and capture gamma spectra；
(2) first processing LaBr3The non-ballistic gamma spectra of gamma detector measurement, is calculated the non-ballistic gamma yield of element；
(3) when formation bulk density, calculating can be by non-ballistic gals for the non-ballistic gamma yield based on element, closely super remote neutron counting
Elements Si, the content of C of horse spectral measurement；
(4) LaBr is handled3The capture gamma spectra of gamma detector measurement, is calculated the capture gamma yield of element；
(5) constituent content and capture gamma yield, calculating determined using non-ballistic gamma can be captured gamma spectrometry
The content of Elements C a, S, Fe；
In above-mentioned steps (3), the specific calculating process of constituent content are as follows:
wI,Si=(exp (a1+a2·ρ)·(a3·RN+a4)+a5)·YI, Si (1)
Wherein, wI,SiFor Si constituent content, YI,SiFor Si element non-ballistic gamma yield；ρ is formation bulk density, can be by normal
Rule log obtains；a1、a2、a3、a4And a5For fitting coefficient；RNRemote sub-count ratio is hankered to be closely super；
In above-mentioned steps (5), the specific process is as follows:
Wherein, wc,jFor the constituent content determined using capture gamma spectra, Yc,jFor the capture gamma yield of element to be calculated,
Yc,SiFor the capture gamma yield of Si element, Sc,jFor the capture measurement sensitivity factor of element, Sc,SiIt is surveyed for the capture of Si element
Measure sensitivity factor.
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| CN108825220B (en) * | 2018-05-25 | 2021-04-16 | 东华理工大学 | Uranium ore logging instrument fusing natural gamma energy spectrum and neutron time spectrum and uranium quantitative equation |
| CN108825219B (en) * | 2018-05-25 | 2021-08-10 | 东华理工大学 | Uranium mine logging scale parameter solving method fusing natural gamma energy spectrum and neutron time spectrum |
| CN109239106A (en) * | 2018-11-09 | 2019-01-18 | 中国石油大学(华东) | Formation water salinity measuring device and method in a kind of well |
| CN110469324B (en) * | 2019-07-31 | 2022-11-01 | 中国石油天然气集团有限公司 | Method for calculating stratum density based on pulse neutron logging |
| CN110454147B (en) * | 2019-07-31 | 2023-01-10 | 中国石油天然气集团有限公司 | Controllable source integrated nuclear logging instrument and logging method |
| CN110486002B (en) * | 2019-08-26 | 2021-05-25 | 中国石油大学(北京) | Method and equipment for determining volume density of stratum in neutron gamma density logging |
| CN111335886B (en) * | 2020-02-06 | 2023-04-28 | 长江大学 | Neutron gamma density logging measurement device and method |
| CN112904436B (en) * | 2021-04-14 | 2022-07-05 | 中国石油大学(华东) | Porosity measurement method combining element yield and thermal neutron count ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009082552A2 (en) * | 2007-11-07 | 2009-07-02 | Baker Hughes Incorporated | Azimuthal elemental imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7073378B2 (en) * | 2003-08-07 | 2006-07-11 | Schlumberger Technology Corporation | Integrated logging tool for borehole |
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