CN106291727B - A kind of method and device of stratum magnesium elements qualitative evaluation - Google Patents
A kind of method and device of stratum magnesium elements qualitative evaluation Download PDFInfo
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- CN106291727B CN106291727B CN201610559816.7A CN201610559816A CN106291727B CN 106291727 B CN106291727 B CN 106291727B CN 201610559816 A CN201610559816 A CN 201610559816A CN 106291727 B CN106291727 B CN 106291727B
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 158
- 239000011777 magnesium Substances 0.000 title claims abstract description 158
- 238000011156 evaluation Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001228 spectrum Methods 0.000 claims abstract description 92
- 238000001730 gamma-ray spectroscopy Methods 0.000 claims abstract description 73
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 44
- 230000005251 gamma ray Effects 0.000 claims abstract description 12
- 230000003595 spectral effect Effects 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 abstract description 8
- 239000006028 limestone Substances 0.000 abstract description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 7
- 239000011435 rock Substances 0.000 description 9
- 238000012545 processing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000342 Monte Carlo simulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000010183 spectrum analysis Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
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- 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
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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)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Radiation (AREA)
Abstract
The present invention relates to technical field of geological exploration more particularly to a kind of method and devices of stratum magnesium elements qualitative evaluation.This method includes：Obtain the inelastic scattering Gamma-ray spectroscopy data of formation at target locations；The inelastic scattering characteristic gamma ray energy of reflection magnesium elements is determined according to the inelastic scattering Gamma-ray spectroscopy data, and determines therefrom that the energy window of reflection magnesium elements；According to the inelastic scattering Gamma-ray spectroscopy data, the gamma spectra obtained in the energy window of the reflection magnesium elements counts；It is counted according to the gamma spectra and qualitative evaluation is carried out to the magnesium elements of the formation at target locations, obtain the relative amount delta data of magnesium elements in the formation at target locations.The method of the embodiment of the present application is simple, and operand is small, realizes the fast qualitative evaluation to stratum magnesium elements, meets and distinguish limestone and dolomitic demand in carbonate formation.
Description
Technical field
The present invention relates to technical field of geological exploration more particularly to a kind of methods and dress of stratum magnesium elements qualitative evaluation
It sets.
Background technology
During carbonate reservoir dolomitization, magnesium elements substitute the calcium constituent in calcite, and reservoir occurs one
Determine degree to shrink and generate microcrack system, reservoir space is made to greatly increase, therefore, in white clouds lithification seismic exploration, magnesium member
Element is that limestone and dolomitic key element are distinguished in carbonate reservoir.
Stratum element well logging is generated with stratum element nuclear reaction by measuring the neutron that neutron source emits to stratum
Gamma spectra, can accurately obtain stratum element content using Analysis of Gamma Energy Spectrum method.By being surveyed to stratum geochemical well logging
The inelastic scattering Gamma-ray spectroscopy parsing of amount can obtain the magnesium element content on stratum, so as to distinguish limestone and white clouds
Rock.In the well logging qualitative evaluation of formation lithology, the parsing of prior art power spectrum is needed using logger in master scale tank
The standard gamma power spectrum of measurement carries out spectrum unscrambling to the gamma spectra of underground survey, and then resolving spectra is further processed
Stratum magnesium element content can be just obtained, although the technology can obtain the absolute value of stratum magnesium element content, data processing
Process is extremely complex, needs the technical staff that very professional research stratum element is logged well that could complete.Therefore, how quickly
The problem of qualitatively evaluation stratum magnesium element content is still urgent need to resolve in white clouds lithification seismic exploration.
Invention content
The embodiment of the present application provides a kind of method and device of stratum magnesium elements qualitative evaluation, with quick qualitative evaluation
Stratum magnesium elements.
In order to achieve the above objectives, on the one hand, the embodiment of the present application provides a kind of method of stratum magnesium elements qualitative evaluation,
The method includes：
Obtain the inelastic scattering Gamma-ray spectroscopy data of formation at target locations；
The inelastic scattering characteristic gamma ray of reflection magnesium elements is determined according to the inelastic scattering Gamma-ray spectroscopy data
Energy, and determine therefrom that the energy window of reflection magnesium elements；
According to the inelastic scattering Gamma-ray spectroscopy data, the gamma spectra in the energy window of the reflection magnesium elements is obtained
It counts；
It is counted according to the gamma spectra and qualitative evaluation is carried out to the magnesium elements of the formation at target locations, with obtaining the target
The relative amount delta data of magnesium elements in layer.
Further, the inelastic scattering characteristic gamma ray energy of the reflection magnesium elements is 2.75Mev.
Further, the energy window of the reflection magnesium elements is 2.63~2.84MeV.
Further, according to the inelastic scattering Gamma-ray spectroscopy data, in the energy window for obtaining the reflection magnesium elements
Gamma spectra count, including：
The inelastic scattering Gamma-ray spectroscopy data are pre-processed, pretreated inelastic scattering gamma energy is obtained
Modal data；
The pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is obtained non-after normalized
Elastic scattering gamma spectra data；
According to the inelastic scattering Gamma-ray spectroscopy data after the normalized, the energy of the reflection magnesium elements is obtained
Gamma spectra in window counts.
Further, the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is normalized
Inelastic scattering Gamma-ray spectroscopy data that treated, including：
The all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is normalized
Inelastic scattering Gamma-ray spectroscopy data that treated.
Further, the magnesium elements progress qualitative evaluation to the formation at target locations is being counted according to the gamma spectra, obtaining
Before taking the relative amount delta data of magnesium elements in the formation at target locations, further include：
The data weighting that the gamma spectra counts is adjusted, the gamma spectra after being adjusted counts；
It is corresponding, it is counted according to the gamma spectra after the adjustment and qualitative comment is carried out to the magnesium elements of the formation at target locations
Valence obtains the relative amount delta data of magnesium elements in the formation at target locations.
On the other hand, the embodiment of the present application also provides a kind of device of stratum magnesium elements qualitative evaluation, described device is also
Including：
Acquiring unit, the inelastic scattering Gamma-ray spectroscopy data for obtaining formation at target locations；
Energy window determination unit, the non-ballistic for determining reflection magnesium elements according to the inelastic scattering Gamma-ray spectroscopy data
Property scattering signatures gamma energy, and determine therefrom that reflection magnesium elements energy window；
Gamma spectra counts acquiring unit, for according to the inelastic scattering Gamma-ray spectroscopy data, obtaining the reflection
Gamma spectra in the energy window of magnesium elements counts；
Qualitative evaluation unit carries out qualitative comment for being counted according to the gamma spectra to the magnesium elements of the formation at target locations
Valence obtains the relative amount delta data of magnesium elements in the formation at target locations.
Further, the inelastic scattering characteristic gamma ray energy of the reflection magnesium elements is 2.75Mev.
Further, the energy window of the reflection magnesium elements is 2.63~2.84MeV.
Further, the gamma spectra counting acquiring unit includes：
Subelement is pre-processed, for being pre-processed to the inelastic scattering Gamma-ray spectroscopy data, after being pre-processed
Inelastic scattering Gamma-ray spectroscopy data；
Normalized subelement, for place to be normalized to the pretreated inelastic scattering Gamma-ray spectroscopy
Reason obtains the inelastic scattering Gamma-ray spectroscopy data after normalized；
Gamma spectra count sub-element is used for according to the inelastic scattering Gamma-ray spectroscopy data after the normalized,
The gamma spectra obtained in the energy window of the reflection magnesium elements counts.
Further, the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is normalized
Inelastic scattering Gamma-ray spectroscopy data that treated, including：
The all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is normalized
Inelastic scattering Gamma-ray spectroscopy data that treated.
Further, described device further includes：
Data weighting adjustment unit, the data weighting counted for adjusting the gamma spectra, the gamma after being adjusted
Power spectrum counts；
Corresponding, the qualitative evaluation unit is used to be counted to the formation at target locations according to the gamma spectra after the adjustment
Magnesium elements carry out qualitative evaluation, obtain the relative amount delta data of magnesium elements in the formation at target locations.
In the embodiment of the present application, by obtaining the inelastic scattering Gamma-ray spectroscopy data of formation at target locations, reflection magnesium member is determined
The energy window of element, the gamma spectra then obtained in the energy window of reflection magnesium elements counts, then the energy by reflecting magnesium elements
Gamma spectra calculating in window realizes stratum magnesium elements fast qualitative evaluation, obtains stratum magnesium elements relative amount variation number
According to.The method of energy spectrum analysis compared with the prior art, the embodiment of the present application is utilized to inelastic scattering Gamma-ray spectroscopy data
Then processing utilizes the direct qualitative evaluation stratum magnesium element content of Gama Count that can reflect in magnesium elements energy window, the application
The method of embodiment is simple, and operand is small, realizes the fast qualitative evaluation to stratum magnesium elements, meets carbonate formation
Middle differentiation limestone and dolomitic demand.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is the method flow diagram of the stratum magnesium elements qualitative evaluation of the embodiment of the present application；
Fig. 2 is the schematic diagram of the rock physics volume-based model 1 of one embodiment of the application；
Fig. 3 is the schematic diagram of the Monte Carlo simulation technique model of one embodiment of the application；
Fig. 4 is the inelastic scattering Gamma-ray spectroscopy schematic diagram of one embodiment of the application；
Fig. 5 is the schematic diagram of the rock physics volume-based model 2 of one embodiment of the application；
Fig. 6 is gamma ray count rate and stratum magnesium elements matter in the energy window of the reflection magnesium elements of one embodiment of the application
Measure percentage relation curve graph；
Fig. 7 is that the result of the fast qualitative evaluation stratum magnesium elements of the real logging data processing of one embodiment of the application is shown
It is intended to；
Fig. 8 is the structure drawing of device of the stratum magnesium elements qualitative evaluation of the embodiment of the present application.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The every other embodiment that technical staff is obtained without making creative work should all belong to the application protection
Range.
Below in conjunction with the accompanying drawings, the specific implementation mode of the embodiment of the present application is described in further detail.
With reference to figure 1, the embodiment of the present application provides a kind of method of stratum magnesium elements qualitative evaluation, the method includes：
S1, the inelastic scattering Gamma-ray spectroscopy data for obtaining formation at target locations.
In the embodiment of the present application, the inelastic scattering Gamma-ray spectroscopy of formation at target locations can be by using the stratum of pulsed neutron source
The well-log information of geochemical well logging instrument record obtains.
S2, determine that the inelastic scattering characteristic gamma of reflection magnesium elements is penetrated according to the inelastic scattering Gamma-ray spectroscopy data
Heat input, and determine therefrom that the energy window of reflection magnesium elements；
In the embodiment of the present application, the non-resilient characteristic gamma ray energy of magnesium elements is 2.75MeV, reflects the energy of magnesium elements
Amount window is 2.63~2.84MeV.
S3, according to the inelastic scattering Gamma-ray spectroscopy data, obtain the gamma in the energy window of the reflection magnesium elements
Power spectrum counts.
In the embodiment of the present application, the gamma spectra counting obtained in the energy window of the reflection magnesium elements includes：
The inelastic scattering Gamma-ray spectroscopy data are pre-processed, pretreated inelastic scattering gamma energy is obtained
Modal data；
The pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is obtained non-after normalized
Elastic scattering gamma spectra data；
According to the inelastic scattering Gamma-ray spectroscopy data after the normalized, the energy of the reflection magnesium elements is obtained
Gamma spectra in window counts.
In the embodiment of the present application, the pretreatment includes being deducted capture radiation to shown inelastic gamma gamma-spectrometric data
Reaction influences, the processing such as correction are floated in filtering and spectrum.To the all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy into
Row normalized obtains the inelastic scattering Gamma-ray spectroscopy data after normalized.In the embodiment of the present application, at normalization
Reason is to count the power spectrum of entire energy section to add up, then per pass calculating divided by power spectrum are calculated and added up, after making normalization
For data between 0~1, the sum of gamma-spectrometric data of entire energy section is 1.Normalized is the qualitative meter of magnesium elements that makes that treated
Calculation value can reflect the variation of entire well section.In the embodiment of the present application, pass through the inelastic scattering Gamma-ray spectroscopy after normalized
The Gama Count of the energy window of reflection magnesium elements can be determined in data.
S4, the all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is returned
One changes treated inelastic scattering Gamma-ray spectroscopy data.
In the embodiment of the present application, the gamma spectra in energy window by reflecting magnesium elements counts, so as to realize pair
The qualitative evaluation of magnesium elements can obtain the relative amount delta data of magnesium elements by qualitative evaluation, in the prior art, although
The absolute value of stratum magnesium element content can be obtained by power spectrum parsing, but spectrum unscrambling is carried out to pretreated gamma spectra first
Process is more complicated, needs to carry out complicated data handling procedure；Secondly it needs to utilize standard power spectrum number in power spectrum resolving
According to, and standard gamma-spectrometric data needs professional to measure acquisition in master scale tank using logger, acquisition process is cumbersome；
After power spectrum parsing simultaneously obtains element relative yield, it is also necessary to can just obtain member after relative yield is carried out volume of data conversion
Cellulose content, therefore, prior art data handling procedure are extremely complex, while being also required to professional technician's parsing.The application is real
The gamma spectra applied in energy window of the example by reflecting magnesium elements counts, and qualitative evaluation is carried out to the magnesium elements of formation at target locations, from
And the relative amount delta data of magnesium elements can reflect limestone and dolomitic variation in the formation at target locations obtained, it is relatively existing
There is technology, after the embodiment of the present application is by pre-processing gamma spectra, obtains the gamma spectra in reflection magnesium elements energy window
Counting can qualitatively evaluate stratum magnesium element content, do not need complicated spectrum unscrambling process, do not need the standard during spectrum unscrambling
Gamma spectra does not need the complex process that element relative yield is converted to constituent content yet.The method operation of the embodiment of the present application
It measures small, is simple and efficient, the qualitative evaluation to stratum magnesium elements may be implemented, it is accurately fixed in carbonate formation so as to meet
Property distinguish limestone and dolomitic demand.
In the embodiment of the present application, before step S5, further include：
The data weighting that the gamma spectra counts is adjusted, the gamma spectra after being adjusted counts；
It is corresponding, it is counted according to the gamma spectra after the adjustment and qualitative comment is carried out to the magnesium elements of the formation at target locations
Valence obtains the relative amount delta data of magnesium elements in the formation at target locations.
In the embodiment of the present application, the gamma spectra count value that reflects in the energy window of magnesium elements be it is very small, therefore
Data fluctuations are also especially small, and by adjusting data variation weight, so as to increase data fluctuations, it is subsequent fixed to be conducive to
Property evaluation.In one embodiment of the application, magnesium elements energy can will be reflected by adjusting the data weighting that the gamma spectra counts
Gamma spectra counting in window amplifies certain multiple again after uniformly subtracting certain radix, to increase the energy of the reflection magnesium elements
Measure the fluctuation that gamma spectra counts in window.
In the embodiment of the present application, pre-processed by the inelastic scattering Gamma-ray spectroscopy data of the formation at target locations to acquisition
And normalized, the gamma spectra obtained in the energy window of reflection magnesium elements count, and then pass through the energy of reflection magnesium elements
Gamma spectra in window counts the fast qualitative evaluation for realizing stratum magnesium elements, obtains stratum magnesium elements relative amount variation
Data.The method of energy spectrum analysis compared with the prior art, the embodiment of the present application is utilized to inelastic scattering Gamma-ray spectroscopy data
Processing, then using can reflect the direct qualitative evaluation stratum magnesium element content of Gama Count in magnesium elements energy window, this Shen
Please embodiment method it is simple, operand is small, realize stratum magnesium elements fast qualitative evaluation, meet carbonate formation
Middle differentiation limestone and dolomitic demand.
In order to clearly illustrate the advantageous effect of the embodiment of the present application, it is exemplified below：
Fig. 2 evaluates the rock physics volume-based model that stratum magnesium elements are set to study fast qualitative in the embodiment of the present application
1.As shown, rock physics volume-based model 1 includes 5 parts：Calcite 201, dolomite 202, quartz 203,204 and of kaolinite
Kerogen 205.
Fig. 3 evaluates the Monte Carlo simulation calculating that stratum magnesium elements are set to study fast qualitative in the embodiment of the present application
Model schematic, simulation design conditions are：Pulsed neutron source 311 in pulsed neutron stratum element logger 31 uses D-T
Pulsed neutron generator, pulsed neutron generator pulse width are 40 μ s, and 312 material of shield is tungsten, and gamma detector 313 is adopted
With bromination billows crystal, the distance between pulsed neutron source 311 and gamma detector 313 are 35cm；Wellbore fluid 32 is fresh water, well
The a diameter of 20cm of eye；Measurement stratum 33 is cylinder, and radial thickness and height are respectively 90cm and 150cm.
Using Monte Carlo simulation computation model shown in Fig. 3, rock volume physical model setting according to Fig.2, is surveyed
Stratum 33 is measured, wherein：The volume basis score of calcite 201, dolomite 202, quartz 203, kaolinite 204 and kerogen 205
Not Wei 30%, 30%, 10%, 20% and 10%, set record gamma spectra time window as 0~40 μ s, blocked using neutron
Method analog record inelastic scattering Gamma-ray spectroscopy, as shown in Figure 4.
Inelastic scattering occur for fast neutron and magnesium elements atomic nucleus react mainly have the 4 characteristic gamma energy peaks, energy to be：
1.36MeV, 1.8MeV, 2.75MeV and 4.23MeV.From fig. 4, it can be seen that energy is in inelastic scattering Gamma-ray spectroscopy
Two characteristic gamma energy peak unobvious of the magnesium elements of 1.36MeV and 4.23MeV, therefore the two characteristic gamma energy peaks are not suitable for
For reflecting stratum magnesium element content；Due to fast neutron and element silicon atomic nucleus inelastic scattering occur react to will produce energy be
The characteristic gamma ray of 1.8MeV, and section bigger than magnesium of inelastic scattering reaction occur more for element silicon, so energy is
The characteristic gamma energy peak of the magnesium elements of 1.78MeV is influenced very big by the element silicon characteristic gamma energy peak that energy is 1.80MeV；
Energy is near the characteristic gamma energy peak of the magnesium elements of 2.75MeV, only by the characteristic gamma energy for the calcium constituent that energy is 3.74MeV
The influence of second escape peak at peak；Comparatively, energy is the characteristic gamma energy peak of the magnesium elements of 2.75MeV the 4 of magnesium elements
In a characteristic gamma energy peak minimum is influenced by other gamma energy peaks.Therefore it can obtain, utilize the magnesium elements that energy is 2.75MeV
Characteristic gamma energy peak reflection magnesium element content be better than the characteristic gamma energy peaks of other energy.Therefore, in the embodiment of the present application
The inelastic scattering characteristic gamma energy peak for determining the use of the magnesium elements that energy is 2.75MeV reflects stratum magnesium element content.
According to the range at the inelastic scattering characteristic gamma energy peak for the magnesium elements that energy in Fig. 4 is 2.75MeV, this hair is selected
For reflecting that the energy window of stratum magnesium elements is 2.63-2.84MeV in bright.
To verify the feasibility for counting reflection stratum magnesium elements using gamma spectra in 2.63-2.84MeV energy windows, setting
Rock physics volume-based model 2 as shown in Figure 5.As shown, rock physics volume-based model 2 includes two parts：501 He of dolomite
Hole 502.
Using Monte Carlo simulation computation model shown in Fig. 3, rock volume physical model setting according to figure 5 is surveyed
Measure stratum 33, be full of oil in hole 502, the percent by volume of setting hole 502 is respectively 0,5%, 10%, 15%, 20%,
25%, 30%, 35% and 40% 9 kinds of Different Strata models set the time window of record gamma spectra as 0~40 μ s, utilize
Inelastic scattering Gamma-ray spectroscopy gamma spectra under the conditions of 9 kinds of Different Stratas of neutron method for cutting analog record obtains reflection magnesium
Gamma spectra counts as shown in Figure 6 with the relationship of magnesium element content in the 2.63-2.84MeV energy windows of element.
From fig. 6, it can be seen that gamma spectra is counted with magnesium in the 2.63-2.84MeV energy windows of reflection stratum magnesium elements
The increase of constituent content constantly increases, and good linear relationship is presented with magnesium element content.Therefore, utilization is further demonstrated
Gamma spectra counts the feasibility of reflection stratum magnesium elements in 2.63-2.84MeV energy windows.
Fig. 7 is at the stratum element well-log information that the 3840-3880 rice well sections to Sichuan X wells of the embodiment of the present application measure
Manage the result map of obtained fast qualitative evaluation stratum magnesium elements.From Fig. 7 kinds as can be seen that the stratum magnesium that present invention processing obtains
Element fast qualitative evaluation result variation tendency obtains stratum magnesium member with stratum element well logging using complicated power spectrum resolving
Cellulose content variation tendency is almost the same, and the two correlation is up to 0.95.
As shown in figure 8, the embodiment of the present application also provides a kind of device of stratum magnesium elements qualitative evaluation, described device is also
Including：
Number acquiring unit 21, the inelastic scattering Gamma-ray spectroscopy data for obtaining formation at target locations；
Energy window determination unit 22, for determining the non-of reflection magnesium elements according to the inelastic scattering Gamma-ray spectroscopy data
Elastic scattering characteristic gamma ray energy, and determine therefrom that the energy window of reflection magnesium elements；
Gamma spectra counts acquiring unit 23, for according to the inelastic scattering Gamma-ray spectroscopy data, obtaining described anti-
The gamma spectra reflected in the energy window of magnesium elements counts；
Qualitative evaluation unit 24, it is qualitative for being carried out to the magnesium elements of the formation at target locations according to gamma spectra counting
Evaluation, obtains the relative amount delta data of magnesium elements in the formation at target locations.
Each component part of the device of the present embodiment be respectively used to realize previous embodiment method each step, due to
In embodiment of the method, each step is described in detail, details are not described herein.
In the embodiment of the present application, pre-processed by the inelastic scattering Gamma-ray spectroscopy data of the formation at target locations to acquisition
And normalized, the gamma spectra obtained in the energy window of reflection magnesium elements count, and then pass through the energy of reflection magnesium elements
Gamma spectra in window counts the fast qualitative evaluation for realizing stratum magnesium elements, obtains stratum magnesium elements relative amount variation
Data.The method of energy spectrum analysis compared with the prior art, the embodiment of the present application is utilized to inelastic scattering Gamma-ray spectroscopy data
Processing, then using can reflect the direct qualitative evaluation stratum magnesium element content of Gama Count in magnesium elements energy window, this Shen
Please embodiment method it is simple, operand is small, realize stratum magnesium elements fast qualitative evaluation, meet carbonate formation
Middle differentiation limestone and dolomitic demand.
In one or more illustrative designs, above-mentioned function described in the embodiment of the present application can be in hardware, soft
Part, firmware or the arbitrary of this three combine to realize.If realized in software, these functions can store and computer-readable
On medium, or with one or more instruction or code form be transmitted on the medium of computer-readable.Computer readable medium includes electricity
Brain storaging medium and convenient for allow computer program to be transferred to from a place telecommunication media in other places.Storaging medium can be with
It is that any general or special computer can be with the useable medium of access.For example, such computer readable media may include but
It is not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices or other
What can be used for carry or store with instruct or data structure and it is other can be by general or special computer or general or specially treated
The medium of the program code of device reading form.
Particular embodiments described above has carried out further in detail the purpose, technical solution and advantageous effect of the application
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the embodiment of the present application, is not used to limit this Shen
Protection domain please, within the spirit and principles of this application, any modification, equivalent substitution, improvement and etc. done should all wrap
It is contained within the protection domain of the application.
Claims (8)
1. a kind of method of stratum magnesium elements qualitative evaluation, which is characterized in that the method includes：
Obtain the inelastic scattering Gamma-ray spectroscopy data of formation at target locations；
The inelastic scattering characteristic gamma ray energy of reflection magnesium elements is determined according to the inelastic scattering Gamma-ray spectroscopy data,
And determine therefrom that the energy window of reflection magnesium elements；
According to the inelastic scattering Gamma-ray spectroscopy data, the gamma spectra meter in the energy window of the reflection magnesium elements is obtained
Number；
It is counted according to the gamma spectra and qualitative evaluation is carried out to the magnesium elements of the formation at target locations, obtained in the formation at target locations
The relative amount delta data of magnesium elements；Wherein,
It is described according to the inelastic scattering Gamma-ray spectroscopy data, obtain the gamma spectra in the energy window of the reflection magnesium elements
It counts, including：
The inelastic scattering Gamma-ray spectroscopy data are pre-processed, pretreated inelastic scattering Gamma-ray spectroscopy number is obtained
According to；
The pretreated inelastic scattering Gamma-ray spectroscopy is normalized, is obtained non-resilient after normalized
Scatter gamma spectra data；
According to the inelastic scattering Gamma-ray spectroscopy data after the normalized, in the energy window for obtaining the reflection magnesium elements
Gamma spectra count；
Qualitative evaluation is carried out to the magnesium elements of the formation at target locations being counted according to the gamma spectra, obtains the formation at target locations
Before the relative amount delta data of middle magnesium elements, further include：
The data weighting that the gamma spectra counts is adjusted, the gamma spectra after being adjusted counts；
It is corresponding, it is counted according to the gamma spectra after the adjustment and qualitative evaluation is carried out to the magnesium elements of the formation at target locations, obtained
Take the relative amount delta data of magnesium elements in the formation at target locations.
2. the method for magnesium elements qualitative evaluation in stratum as described in claim 1, which is characterized in that described to reflect the non-of magnesium elements
Elastic scattering characteristic gamma ray energy is 2.75Mev.
3. the method for magnesium elements qualitative evaluation in stratum as claimed in claim 2, which is characterized in that the energy of the reflection magnesium elements
Amount window is 2.63~2.84MeV.
4. the method for magnesium elements qualitative evaluation in stratum as described in claim 1, which is characterized in that described pretreated non-
Elastic scattering gamma spectra is normalized, and obtains the inelastic scattering Gamma-ray spectroscopy data after normalized, including：
The all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, normalized is obtained
Inelastic scattering Gamma-ray spectroscopy data afterwards.
5. a kind of device of stratum magnesium elements qualitative evaluation, which is characterized in that described device includes：
Acquiring unit, the inelastic scattering Gamma-ray spectroscopy data for obtaining formation at target locations；
Energy window determination unit, for determining that the non-resilient of reflection magnesium elements dissipates according to the inelastic scattering Gamma-ray spectroscopy data
Characteristic gamma ray energy is penetrated, and determines therefrom that the energy window of reflection magnesium elements；
Gamma spectra counts acquiring unit, for according to the inelastic scattering Gamma-ray spectroscopy data, obtaining the reflection magnesium member
Gamma spectra in the energy window of element counts；
Qualitative evaluation unit carries out qualitative evaluation for being counted according to the gamma spectra to the magnesium elements of the formation at target locations,
Obtain the relative amount delta data of magnesium elements in the formation at target locations；Wherein,
The gamma spectra counts acquiring unit：
Subelement is pre-processed, for being pre-processed to the inelastic scattering Gamma-ray spectroscopy data, is obtained pretreated non-
Elastic scattering gamma spectra data；
Normalized subelement is obtained for the pretreated inelastic scattering Gamma-ray spectroscopy to be normalized
Obtain the inelastic scattering Gamma-ray spectroscopy data after normalized；
Gamma spectra count sub-element, for according to the inelastic scattering Gamma-ray spectroscopy data after the normalized, obtaining
Gamma spectra in the energy window of the reflection magnesium elements counts；
Described device further includes：
Data weighting adjustment unit, the data weighting counted for adjusting the gamma spectra, the gamma spectra after being adjusted
It counts；
Corresponding, the qualitative evaluation unit is used to count the magnesium to the formation at target locations according to the gamma spectra after the adjustment
Element carries out qualitative evaluation, obtains the relative amount delta data of magnesium elements in the formation at target locations.
6. the device of magnesium elements qualitative evaluation in stratum as claimed in claim 5, which is characterized in that described to reflect the non-of magnesium elements
Elastic scattering characteristic gamma ray energy is 2.75Mev.
7. the device of magnesium elements qualitative evaluation in stratum as claimed in claim 6, which is characterized in that the energy of the reflection magnesium elements
Amount window is 2.63~2.84MeV.
8. the device of magnesium elements qualitative evaluation in stratum as claimed in claim 5, which is characterized in that described pretreated non-
Elastic scattering gamma spectra is normalized, and obtains the inelastic scattering Gamma-ray spectroscopy data after normalized, including：
The all-round spectral coverage of the pretreated inelastic scattering Gamma-ray spectroscopy is normalized, normalized is obtained
Inelastic scattering Gamma-ray spectroscopy data afterwards.
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| CN104297810A (en) * | 2014-10-24 | 2015-01-21 | 中国石油天然气股份有限公司 | Method for obtaining pure inelastic scattering gamma-ray energy spectra in stratum element well logging |
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| CN104297810A (en) * | 2014-10-24 | 2015-01-21 | 中国石油天然气股份有限公司 | Method for obtaining pure inelastic scattering gamma-ray energy spectra in stratum element well logging |
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