CN112114382A - Correction method for neutron capture gamma standard spectrum of formation element logging - Google Patents
Correction method for neutron capture gamma standard spectrum of formation element logging Download PDFInfo
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- 238000001228 spectrum Methods 0.000 title claims abstract description 168
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 26
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005755 formation reaction Methods 0.000 description 32
- 239000011777 magnesium Substances 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052749 magnesium Inorganic materials 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 239000010438 granite Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000003556 assay Methods 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 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
- 230000009286 beneficial effect Effects 0.000 description 1
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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- General Life Sciences & Earth Sciences (AREA)
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- Geophysics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention belongs to the technical field of petroleum logging, and particularly discloses a correction method of a neutron capture gamma standard spectrum in formation element logging, which comprises the following steps: acquiring a neutron capture gamma spectrum of a known element as a standard spectrum of the known element; establishing an oxide simulated formation model containing the element to be corrected to obtain a simulated standard spectrum of the element to be corrected; obtaining the yield of each element through the calculation of a formation survey spectrum; obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element; calculating the variance between the measured spectrum and the inversion spectrum weight; and finishing the correction until the weight variance value is less than or equal to a preset value, and obtaining a corrected element standard spectrum to be corrected. The method for correcting the difference between the measured spectrum and the inversion spectrum of the stratum with known element content is used for obtaining the element neutron capture gamma standard spectrum which is difficult to obtain under the condition of some physical models. The method can effectively improve the solving precision of the element content of the complex stratum, and obviously improve the condition of negative value of the element content in the prior solving process.
Description
Technical Field
The invention belongs to the technical field of petroleum logging, and particularly relates to a correction method of a neutron capture gamma standard spectrum in formation element logging.
Background
The formation element logging method is one of effective logging methods for evaluating hydrocarbon reservoirs of complex formations, and is developed rapidly in recent years. The accurate acquisition of the content of the elements is an important basis for determining the effect of the logging method. Elemental logging is the irradiation of the formation with neutrons and the measurement of the resulting neutron non-elastic and neutron capture gamma spectra to determine the elemental content, the basic method being based on the linear superposition of the single gamma spectra of each element in the formation. The currently available general solution method is the weighted least squares method. The relative yield of each element is obtained through spectrum decomposition, and the relative yield is converted into the element content in a closed model mode. The exact elemental standard spectrum is the key to this approach.
Obtaining a standard spectrum of elements through a real physical model is the most efficient method. However, due to conditional constraints, it is difficult to obtain standard spectra of some elements by means of physical models. The method for acquiring the standard spectrum by numerical simulation is also an effective method, and the Monte Carlo MCNP program is a popular program which is currently used for numerical simulation, but is influenced by factors such as the accuracy of an element reaction data section used by the program; the calculation precision of the response of the detector to the gamma ray; and establishing the difference between the calculation geometric model and the real model, so that the standard spectrum obtained by simulation calculation has some difference with the standard spectrum obtained by actual measurement. Therefore, when the standard spectrum is used for solving the element content, when the stratum is complex, the types of the elements in the stratum are more, and the result of the solved element content generates larger errors. In the literature at home and abroad, a standard spectrum obtaining mode is mentioned and is obtained through simulation or actual measurement, but the method for calibrating the standard spectrum is not related.
Disclosure of Invention
The invention aims to provide a correction method of a neutron capture gamma standard spectrum (hereinafter referred to as standard spectrum) of a formation element logging, which is used for acquiring the neutron capture gamma standard spectrum of an element to be corrected in a correction mode of a simulated spectrum under the condition that the acquisition of the neutron capture gamma standard spectrum of the element by a physical model is difficult.
The invention is realized by the following technical scheme:
a correction method for neutron capture gamma standard spectrum of formation element logging comprises the following steps:
(1) measuring in a formation physical model composed of oxides or oxycarbides of known elements to obtain a neutron capture gamma spectrum, wherein the neutron capture gamma spectrum is used as a standard spectrum of the known elements;
(2) establishing an oxide simulated formation model containing an element to be corrected, and calculating a neutron capture gamma spectrum as a simulated standard spectrum of the element to be corrected;
(3) measuring a stratum containing an element to be corrected and a known element to obtain a stratum measurement spectrum of the stratum;
(4) obtaining the yield of each element through the calculation of a formation survey spectrum;
(5) obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element;
(6) solving a weight variance value of the inversion neutron capture gamma spectrum obtained in the step (5) and the neutron capture gamma spectrum in the step (3);
(7) comparing the weight variance value with a preset value, and when the weight variance value is larger than the preset value, normalizing the standard spectrum of the element to be corrected again;
(8) and (5) repeating the steps (4) to (7) until the weight variance value is less than or equal to a preset value, and finishing correction to obtain a corrected element standard spectrum to be corrected.
Further, in the step (4), the yield of each element obtained by neutron capture gamma spectrum calculation is calculated by the following formula:
wherein, CiThe ith count value represents a formation survey spectrum;
aija standard spectral response count of the ith trace representing the previous jth element;
Yjrepresents the yield of the jth element;
i represents the number of channels of the neutron capture gamma spectrum acquired by measurement; 1, 2, 3 … … n;
m represents the number of elements participating in solving;
irepresenting the error between the measured value and the true value of the ith track.
Further, in the step (5), an inversion neutron capture gamma spectrum is obtained according to the yield inversion of each element, and the following formula is specifically adopted for calculation:
CFithe trace counts representing the measured spectra are the difference from the inverted trace counts after yield determination.
Further, in step (6), the solution weight variance value CF is calculated by the following formula:
wherein, WiRepresentative of the yield YjThe weighting value of (2).
Further, in the step (7), the standard spectrum of the element to be corrected is calculated by using the following formula:
a′ij＝aij*(1+Wi(ci-aijYj)/k) (4)
corrected a'ijIs normalized and then is substituted into the formula (1), at the moment'ijAs a in formula (1)ij；
Wherein, a'ijA corrected ith trace standard spectral response count representing the jth element;
k represents a scaling factor.
Further, in the step (1), an element logging instrument is used for obtaining a calcium element standard spectrum from calcium carbonate formation physical model measurement, or obtaining a silicon element standard spectrum from silica formation physical model measurement, or obtaining a hydrogen element standard spectrum from water measurement as a basic known element standard spectrum.
Further, in the step (7), 0< the preset value is less than or equal to 0.002.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a correction method of a neutron capture gamma standard spectrum for formation element logging, which comprises the steps of obtaining a neutron capture gamma spectrum of a known element as a known element standard spectrum; establishing an oxide simulated formation model containing the element to be corrected to obtain a simulated standard spectrum of the element to be corrected; obtaining the yield of each element through the calculation of a formation survey spectrum; obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element; calculating the variance between the measured spectrum and the inversion spectrum weight; and finishing the correction until the weight variance value is less than or equal to a preset value, and obtaining a corrected element standard spectrum to be corrected. The method for correcting the difference between the measured spectrum and the inversion spectrum of the stratum with known element content is used for obtaining the element neutron capture gamma standard spectrum which is difficult to obtain under the condition of some physical models. The method can effectively improve the solving precision of the element content of the complex stratum, and obviously improve the condition of negative value of the element content in the prior solving process. Under the condition that the physical model is difficult to obtain the element neutron capture gamma standard spectrum, the more accurate element neutron capture gamma standard spectrum can be obtained through inversion correction of the simulated spectrum. The standard spectrum is obtained through a correction mode, so that the problem of difficulty in obtaining the physical model is solved, and the material and financial resources are saved.
Drawings
FIG. 1 is a flowchart of the standard spectrum calibration of the present invention;
FIG. 2 is a standard spectrum of H and Ca elements obtained from water well and calcium carbonate formation model measurements;
FIG. 3 is a simulated standard spectrum before correction and a standard spectrum after correction of Mg element;
FIG. 4 is a measurement spectrum obtained by dolomite formation measurement, an inversion spectrum obtained by primarily using a simulated Mg element standard spectrum, and a corrected inversion spectrogram obtained finally after correcting Mg elements;
fig. 5 shows a simulated standard spectrum before correction and a standard spectrum after correction of aluminum element.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a correction method of a neutron capture gamma standard spectrum in formation element logging, which comprises the following steps:
(1) measuring in a formation physical model composed of oxides or oxycarbides of known elements to obtain a neutron capture gamma spectrum, wherein the neutron capture gamma spectrum is used as a standard spectrum of the known elements;
(2) establishing an oxide simulated formation model containing an element to be corrected, and calculating a neutron capture gamma spectrum as a simulated standard spectrum of the element to be corrected;
(3) measuring a stratum containing an element to be corrected and a known element to obtain a stratum measurement spectrum of the stratum;
(4) obtaining the yield of each element through the calculation of a formation survey spectrum;
(5) obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element;
(6) solving a weight variance value of the inversion neutron capture gamma spectrum obtained in the step (5) and the neutron capture gamma spectrum in the step (3);
(7) comparing the weight variance value with a preset value, and when the weight variance value is larger than the preset value, normalizing the standard spectrum of the element to be corrected again;
(8) and (5) repeating the steps (4) to (7) until the weight variance value is less than or equal to a preset value, and finishing correction to obtain a corrected element standard spectrum to be corrected.
In the step (1), an element logging instrument is used for measuring and obtaining a calcium element standard spectrum from a calcium carbonate formation physical model, or measuring and obtaining a silicon element standard spectrum from a silicon dioxide formation physical model, or measuring and obtaining a hydrogen element standard spectrum from water to serve as a basic known element standard spectrum.
Example 1
As shown in fig. 1, this example illustrates a standard spectral method of how to obtain Mg element by correction.
(1) Measuring a calcium carbonate stratum model by using a logging instrument to obtain a standard spectrum of a calcium element, and measuring a water well to obtain a standard spectrum of a hydrogen element, wherein the standard spectrum is shown in figure 2; the standard spectrum of calcium element and hydrogen element is used as the known standard spectrum.
(2) Establishing a magnesium oxide simulated formation model by using a Monte Carlo MCNP program, and calculating to obtain a neutron capture gamma spectrum of the magnesium element as a simulated standard spectrum of the magnesium element, wherein the simulated standard spectrum is shown in figure 3;
(3) irradiating the stratum by using a logging instrument, measuring a dolomite stratum containing magnesium and calcium, and obtaining a dolomite stratum measurement spectrum by measuring the action of neutrons and stratum elements, wherein the diagram is shown in figure 4;
(4) obtaining the yield of each element through the calculation of a formation measurement spectrum, and solving a neutron capture gamma spectrum response equation (formula 1) by using a weighted least square method to obtain the yield of each element;
wherein, CiThe ith count value represents a formation survey spectrum;
aija standard spectral response count of the ith trace representing the previous jth element;
Yjrepresents the yield of the jth element;
i represents the number of channels of the neutron capture gamma spectrum acquired by measurement; 1, 2, 3 … … n;
m represents the number of elements participating in solving;
irepresenting the error between the measured value and the true value of the ith track.
(5) Obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element, and specifically adopting the following formula to calculate:
CFia variable, by definition, represents the difference between the trace count of the measured spectrum and the trace count inverted after yield calculation.
(6) Solving a weight variance value of the inversion neutron capture gamma spectrum obtained in the step (5) and the neutron capture gamma spectrum in the step (3);
wherein, WiRepresentative of the yield YjWeighted value of (1), usually Wi＝1/Yj；CiIs the count value of the ith track corresponding to the measured spectrum.
Substituting the simulation standard spectrum before Mg element correction and the standard spectrum of calcium element and hydrogen element into a formula 1, solving the CF value of 0.05 by formulas 1-3, comparing the weight variance value with a preset value, setting the preset value to be 0.002, and analyzing according to errors when the weight variance value is larger than the preset value, wherein the accuracy requirement cannot be met.
(7) The standard spectrum of the magnesium element is corrected according to the following formula:
a′ij＝aij*(1+Wi(ci-aijYj)/k)…(4)
c, correcting the alpha'ijIs normalized and then is substituted into the formula (1), at the moment'ijAs a in formula (1)ij；
Wherein, a'ijA corrected ith trace standard spectral response count representing the jth element;
k represents a scaling factor.
(8) And (5) repeating the steps (4) to (7) until the weight variance value is less than or equal to 0.002, wherein the Mg element spectrum corrected by the method is the magnesium element standard spectrum meeting the requirements.
Because the neutron capture gamma spectrum of the elements related to the well bore, the formation pore water, the calcium carbonate formation and the calcium magnesium carbonate formation is 3 elements, namely calcium, hydrogen and magnesium, the value of J in the embodiment is 1-3.
Example 2
The standard spectrum of the aluminum element is obtained by correction, and the method comprises the following steps:
the method comprises the steps of selecting a granite stratum as a measuring stratum, wherein main elements in the stratum comprise silicon, calcium, aluminum, sodium and the like, standard spectrums of the silicon, calcium, sodium, titanium, gadolinium and other elements are obtained through actual measurement, and the standard spectrum of the aluminum element can be obtained through direct measurement without an actual stratum model and is obtained in a correction mode as required. The same procedure as in example 1 was followed:
(1) measuring a calcium carbonate stratum model by using a logging instrument to obtain a standard spectrum of a calcium element, and measuring a water well to obtain a standard spectrum of a hydrogen element, wherein the standard spectrum is shown in figure 2; the standard spectrum of calcium element and hydrogen element is used as the known standard spectrum.
(2) Simulating a spectrum to be corrected of the aluminum element: establishing an alumina simulated formation model by using a Monte Carlo MCNP program, and calculating to obtain a neutron capture gamma spectrum of the aluminum element as a simulated standard spectrum of the aluminum element, wherein the simulated standard spectrum is shown in figure 5;
(3) irradiating the granite stratum by using a logging instrument, measuring the granite stratum containing aluminum elements and calcium elements, and obtaining a granite stratum measurement spectrum by measuring the action of neutrons and stratum elements;
the steps (4) to (8) are the same as the calculation process of the example 1, and the standard spectrum of the aluminum element is finally obtained by correction, as shown in fig. 5.
Table 1 shows the comparison of the element contents obtained by correcting Mg and Al elements using the above example, solving the yield according to equation 1, and then converting the corrected values with the simulated Mg and Al standard spectra, with the element contents solved in two actual measurement modules for formation marble and granite, under the condition that the standard spectra for other elements are not changed. The result shows that the content solving precision is obviously improved. The assay values in the table are the results of the assay analysis of the authoritative sample. As can be seen from table 1, the measurement results after the standard spectrum was corrected are significantly better than before the correction, compared to the analysis values. In table 1, the assay analysis value is not 0, but the measured value content is 0, namely, the solution process obtains a negative value and is defined as 0, and the corresponding measured value is obtained after correction.
TABLE 1 comparison table of element content measurement results before and after standard spectrum correction
Claims (7)
1. A correction method for neutron capture gamma standard spectrum in formation element logging is characterized by comprising the following steps:
(1) measuring in a formation physical model composed of oxides or oxycarbides of known elements to obtain a neutron capture gamma spectrum, wherein the neutron capture gamma spectrum is used as a standard spectrum of the known elements;
(2) establishing an oxide simulated formation model containing an element to be corrected, and calculating a neutron capture gamma spectrum as a simulated standard spectrum of the element to be corrected;
(3) measuring a stratum containing an element to be corrected and a known element to obtain a stratum measurement spectrum of the stratum;
(4) obtaining the yield of each element through the calculation of a formation survey spectrum;
(5) obtaining an inversion neutron capture gamma spectrum according to the yield inversion of each element;
(6) solving a weight variance value of the inversion neutron capture gamma spectrum obtained in the step (5) and the neutron capture gamma spectrum in the step (3);
(7) comparing the weight variance value with a preset value, and when the weight variance value is larger than the preset value, normalizing the standard spectrum of the element to be corrected again;
(8) and (5) repeating the steps (4) to (7) until the weight variance value is less than or equal to a preset value, and finishing correction to obtain a corrected element standard spectrum to be corrected.
2. The method for correcting the neutron capture gamma standard spectrum in the logging of the formation elements according to claim 1, wherein in the step (4), the yield of each element obtained by the calculation of the neutron capture gamma spectrum is calculated by the following formula:
wherein, CiThe ith count value represents a formation survey spectrum;
aija standard spectral response count of the ith trace representing the previous jth element;
Yjrepresents the yield of the jth element;
i represents the number of channels of the neutron capture gamma spectrum acquired by measurement; 1, 2, 3 … … n;
m represents the number of elements participating in solving;
irepresenting the error between the measured value and the true value of the ith track.
3. The method for correcting the neutron capture gamma standard spectrum in the logging of the formation elements according to claim 2, wherein in the step (5), the inversion neutron capture gamma spectrum is obtained according to the inversion of the yield of each element, and the method is specifically calculated by adopting the following formula:
CFithe trace counts representing the measured spectra are the difference from the inverted trace counts after yield determination.
4. The method for correcting the neutron capture gamma standard spectrum in the logging of the formation elements according to claim 3, wherein in the step (6), the solving of the weight variance value CF is calculated by the following formula:
wherein, WiRepresentative of the yield YjThe weighting value of (2).
5. The method for correcting the neutron capture gamma standard spectrum in the logging of the formation elements according to claim 4, wherein in the step (7), the standard spectrum of the element to be corrected is calculated by adopting the following formula:
a′ij＝aij*(1+Wi(ci-aijYj)/k) (4)
corrected a'ijIs normalized and then is substituted into the formula (1), at the moment'ijAs a in formula (1)ij；
Wherein, a'ijA corrected ith trace standard spectral response count representing the jth element;
k represents a scaling factor.
6. The method for correcting the neutron capture gamma standard spectrum in the formation element logging according to claim 1, wherein in the step (1), an element logging instrument is used for obtaining the calcium element standard spectrum from the calcium carbonate formation physical model measurement, or obtaining the silicon element standard spectrum from the silicon dioxide formation physical model measurement, or obtaining the known element standard spectrum on which the hydrogen element standard spectrum is based from the water measurement.
7. The method for correcting formation element logging neutron capture gamma standard spectrum according to claim 1, wherein in step (7), 0< the preset value is less than or equal to 0.002.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104239710A (en) * | 2014-09-05 | 2014-12-24 | 西安奥华电子仪器有限责任公司 | Method for confirming yield through spectrum unfolding analysis of stratum element logging instrument |
| CN105093343A (en) * | 2015-08-06 | 2015-11-25 | 中国石油天然气股份有限公司 | Formation element capture gamma-ray spectra measurement method and device |
| CN105182422A (en) * | 2015-09-02 | 2015-12-23 | 中国石油天然气集团公司 | Stratum element logging element standard spectrum making and application method |
| CN105629319A (en) * | 2015-12-25 | 2016-06-01 | 中国石油天然气集团公司 | Device for determining stratum element logging standard spectrum and relative sensitivity and method thereof |
| US20160195636A1 (en) * | 2008-06-25 | 2016-07-07 | Schlumberger Technology Corporation | Absolute elemental concentrations from nuclear spectroscopy |
| CN107229080A (en) * | 2017-05-23 | 2017-10-03 | 兰州大学 | A kind of acquisition methods of geochemical well logging neutron absorption gamma spectra |
| US20180335546A1 (en) * | 2017-05-18 | 2018-11-22 | Baker Hughes Incorporated | Gamma calibration |
| CN111032997A (en) * | 2017-12-26 | 2020-04-17 | 中国石油天然气股份有限公司 | Gamma-ray energy spectrum unscrambling method and device for element capture energy spectrum logging |
-
2020
- 2020-08-19 CN CN202010838528.1A patent/CN112114382A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160195636A1 (en) * | 2008-06-25 | 2016-07-07 | Schlumberger Technology Corporation | Absolute elemental concentrations from nuclear spectroscopy |
| CN104239710A (en) * | 2014-09-05 | 2014-12-24 | 西安奥华电子仪器有限责任公司 | Method for confirming yield through spectrum unfolding analysis of stratum element logging instrument |
| CN105093343A (en) * | 2015-08-06 | 2015-11-25 | 中国石油天然气股份有限公司 | Formation element capture gamma-ray spectra measurement method and device |
| CN105182422A (en) * | 2015-09-02 | 2015-12-23 | 中国石油天然气集团公司 | Stratum element logging element standard spectrum making and application method |
| CN105629319A (en) * | 2015-12-25 | 2016-06-01 | 中国石油天然气集团公司 | Device for determining stratum element logging standard spectrum and relative sensitivity and method thereof |
| US20180335546A1 (en) * | 2017-05-18 | 2018-11-22 | Baker Hughes Incorporated | Gamma calibration |
| CN107229080A (en) * | 2017-05-23 | 2017-10-03 | 兰州大学 | A kind of acquisition methods of geochemical well logging neutron absorption gamma spectra |
| CN111032997A (en) * | 2017-12-26 | 2020-04-17 | 中国石油天然气股份有限公司 | Gamma-ray energy spectrum unscrambling method and device for element capture energy spectrum logging |
Non-Patent Citations (3)
| Title |
|---|
| 刘军涛;张锋;元哲珑;王新光;韩飞;陈铁光;: "页岩气层脉冲中子元素测井蒙特卡罗研究", 测井技术, vol. 39, no. 05, 31 October 2015 (2015-10-31), pages 617 - 621 * |
| 刘绪纲, 孙建孟, 郭云峰: "元素俘获谱测井在储层综合评价中的应用", 测井技术, vol. 29, no. 03, 30 June 2005 (2005-06-30), pages 236 - 239 * |
| 岳爱忠;朱涵斌;何绪新;王树声;樊云峰;: "FEM地层元素测井仪", 石油科技论坛, no. 1, 31 December 2016 (2016-12-31), pages 30 - 34 * |
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