CN106291727A - 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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- CN106291727A CN106291727A CN201610559816.7A CN201610559816A CN106291727A CN 106291727 A CN106291727 A CN 106291727A CN 201610559816 A CN201610559816 A CN 201610559816A CN 106291727 A CN106291727 A CN 106291727A
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Abstract
The present invention relates to technical field of geological exploration, particularly relate to the method and device of a kind of stratum magnesium elements qualitative evaluation.The method includes: obtain the inelastic scattering gamma spectra data of formation at target locations；Determine the inelastic scattering characteristic gamma ray energy of reflection magnesium elements according to described inelastic scattering gamma spectra data, and determine therefrom that the energy window of reflection magnesium elements；According to described inelastic scattering gamma spectra data, obtain the gamma spectra counting in the energy window of described reflection magnesium elements；According to described gamma spectra counting, the magnesium elements of described formation at target locations is carried out qualitative evaluation, obtain the relative amount delta data of magnesium elements in described formation at target locations.The method of the embodiment of the present application is simple, and operand is little, it is achieved that the fast qualitative evaluation to stratum magnesium elements, meets limestone and the dolomitic demand distinguished in carbonate formation.
Description
Technical field
The present invention relates to technical field of geological exploration, particularly relate to method and the dress of a kind of stratum magnesium elements qualitative evaluation
Put.
Background technology
During carbonate reservoir dolomitization, magnesium elements substitutes the calcium constituent in calcite, and reservoir occurs one
Determine degree to shrink and produce microcrack system, make reservoir space be greatly increased, therefore, in white clouds lithification seismic exploration, magnesium unit
Element is to distinguish limestone and dolomitic key element in carbonate reservoir.
Stratum element well logging is that the neutron launched to stratum by measuring neutron source produces with stratum element nuclear reaction
Gamma spectra, utilize Analysis of Gamma Energy Spectrum method can accurately obtain stratum element content.By stratum geochemical well logging is surveyed
The inelastic scattering Analysis of Gamma Energy Spectrum of amount can obtain the magnesium element content on stratum, such that it is able to distinguish limestone and white clouds
Rock.In the well logging qualitative evaluation of formation lithology, prior art power spectrum resolves to be needed to utilize logger in master scale tank
The standard gamma power spectrum measured carries out spectrum unscrambling to the gamma spectra of underground survey, and then is further processed resolving spectra
Just can obtain stratum magnesium element content, although this technology can obtain the absolute value of stratum magnesium element content, but data process
Process is extremely complex, needs the technical staff of very professional research stratum element well logging just can complete.Therefore, the most quickly
Evaluate stratum magnesium element content qualitatively and be still the problem needing solution in white clouds lithification seismic exploration badly.
Summary of the invention
The embodiment of the present application provides the method and device of a kind of stratum magnesium elements qualitative evaluation, with quick qualitative evaluation
Stratum magnesium elements.
For reaching above-mentioned purpose, on the one hand, the embodiment of the present application provides the method for a kind of stratum magnesium elements qualitative evaluation,
Described method includes:
Obtain the inelastic scattering gamma spectra data of formation at target locations；
The inelastic scattering characteristic gamma ray of reflection magnesium elements is determined according to described inelastic scattering gamma spectra data
Energy, and determine therefrom that the energy window of reflection magnesium elements；
According to described inelastic scattering gamma spectra data, obtain the gamma spectra in the energy window of described reflection magnesium elements
Counting；
According to described gamma spectra counting, the magnesium elements of described formation at target locations is carried out qualitative evaluation, obtain described target ground
The relative amount delta data of magnesium elements in Ceng.
Further, the inelastic scattering characteristic gamma ray energy of described reflection magnesium elements is 2.75Mev.
Further, the energy window of described reflection magnesium elements is 2.63～2.84MeV.
Further, according to described inelastic scattering gamma spectra data, obtain in the energy window of described reflection magnesium elements
Gamma spectra counting, including:
Described inelastic scattering gamma spectra data are carried out pretreatment, it is thus achieved that pretreated inelastic scattering gamma energy
Modal data；
Described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that non-after normalized
Elastic scattering gamma spectra data；
According to the inelastic scattering gamma spectra data after described normalized, obtain the energy of described reflection magnesium elements
Gamma spectra counting in window.
Further, described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalization
Inelastic scattering gamma spectra data after process, including:
The all-round spectral coverage of described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalization
Inelastic scattering gamma spectra data after process.
Further, according to described gamma spectra counting, the magnesium elements of described formation at target locations is being carried out qualitative evaluation, obtaining
Before taking the relative amount delta data of magnesium elements in described formation at target locations, also include:
Adjust the data weighting of described gamma spectra counting, it is thus achieved that the gamma spectra counting after adjustment；
Corresponding, count the magnesium elements to described formation at target locations according to the gamma spectra after described adjustment and carry out qualitative commenting
Valency, obtains the relative amount delta data of magnesium elements in described formation at target locations.
On the other hand, the embodiment of the present application additionally provides the device of a kind of stratum magnesium elements qualitative evaluation, and described device is also
Including:
Acquiring unit, for obtaining the inelastic scattering gamma spectra data of formation at target locations；
Energy window determines unit, for determining the non-ballistic of reflection magnesium elements according to described inelastic scattering gamma spectra data
Property scattering signatures gamma energy, and determine therefrom that reflection magnesium elements energy window；
Gamma spectra counting acquiring unit, for according to described inelastic scattering gamma spectra data, obtains described reflection
Gamma spectra counting in the energy window of magnesium elements；
Qualitative evaluation unit, for carrying out qualitative commenting according to described gamma spectra counting to the magnesium elements of described formation at target locations
Valency, obtains the relative amount delta data of magnesium elements in described formation at target locations.
Further, the inelastic scattering characteristic gamma ray energy of described reflection magnesium elements is 2.75Mev.
Further, the energy window of described reflection magnesium elements is 2.63～2.84MeV.
Further, described gamma spectra counting acquiring unit includes:
Pretreatment subelement, for carrying out pretreatment to described inelastic scattering gamma spectra data, it is thus achieved that after pretreatment
Inelastic scattering gamma spectra data；
Normalized subelement, for being normalized place to described pretreated inelastic scattering gamma spectra
Reason, it is thus achieved that the inelastic scattering gamma spectra data after normalized；
Gamma spectra count sub-element, is used for according to the inelastic scattering gamma spectra data after described normalized,
Obtain the gamma spectra counting in the energy window of described reflection magnesium elements.
Further, described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalization
Inelastic scattering gamma spectra data after process, including:
The all-round spectral coverage of described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalization
Inelastic scattering gamma spectra data after process.
Further, described device also includes:
Data weighting adjustment unit, for adjusting the data weighting of described gamma spectra counting, it is thus achieved that the gamma after adjustment
Power spectrum counts；
Corresponding, described qualitative evaluation unit is for counting described formation at target locations according to the gamma spectra after described adjustment
Magnesium elements carry out qualitative evaluation, obtain the relative amount delta data of magnesium elements in described formation at target locations.
In the embodiment of the present application, by obtaining the inelastic scattering gamma spectra data of formation at target locations, determine that reflection magnesium is first
The energy window of element, then obtains the gamma spectra counting in the energy window of reflection magnesium elements, then by reflecting the energy of magnesium elements
Gamma spectra in window calculates and achieves stratum magnesium elements fast qualitative evaluation, obtains stratum magnesium elements relative amount change number
According to.The energy spectrum analysis of hinge structure, the method for the embodiment of the present application make use of inelastic scattering gamma spectra data
Process, the Gama Count direct qualitative evaluation stratum magnesium element content in then utilization can reflect magnesium elements energy window, the application
The method of embodiment is simple, and operand is little, it is achieved that the fast qualitative evaluation to stratum magnesium elements, meets carbonate formation
Middle differentiation limestone and dolomitic demand.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments described in application, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying 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 the application one embodiment；
Fig. 3 is the schematic diagram of the Monte Carlo simulation technique model of the application one embodiment；
Fig. 4 is the inelastic scattering gamma spectra schematic diagram of the application one embodiment；
Fig. 5 is the schematic diagram of the rock physics volume-based model 2 of the application one embodiment；
Fig. 6 be the reflection magnesium elements of the application one embodiment energy window in gamma ray count rate and stratum magnesium elements matter
Amount percentage relation curve chart；
Fig. 7 is that the result of the fast qualitative evaluation stratum magnesium elements of the real logging data process of the application one embodiment 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.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in the application, real below in conjunction with the application
Execute the accompanying drawing in example, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described enforcement
Example is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, this area is common
The every other embodiment that technical staff is obtained under not making creative work premise, all should belong to the application protection
Scope.
Below in conjunction with the accompanying drawings, the detailed description of the invention of the embodiment of the present application is described in further detail.
With reference to Fig. 1, the embodiment of the present application provides the method for a kind of stratum magnesium elements qualitative evaluation, and described method includes:
S1, the inelastic scattering gamma spectra data of acquisition formation at target locations.
In the embodiment of the present application, the inelastic scattering gamma spectra of formation at target locations can be by utilizing the stratum of pulsed neutron source
The well-log information of geochemical well logging instrument record obtains.
S2, according to described inelastic scattering gamma spectra data determine reflection magnesium elements inelastic scattering characteristic gamma penetrate
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, the energy of reflection magnesium elements
Amount window is 2.63～2.84MeV.
S3, according to described inelastic scattering gamma spectra data, obtain the gamma in the energy window of described reflection magnesium elements
Power spectrum counts.
In the embodiment of the present application, obtain the counting of the gamma spectra in the energy window of described reflection magnesium elements and include:
Described inelastic scattering gamma spectra data are carried out pretreatment, it is thus achieved that pretreated inelastic scattering gamma energy
Modal data；
Described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that non-after normalized
Elastic scattering gamma spectra data；
According to the inelastic scattering gamma spectra data after described normalized, obtain the energy of described reflection magnesium elements
Gamma spectra counting in window.
In the embodiment of the present application, described pretreatment includes shown inelastic gamma gamma-spectrometric data is deducted capture radiation
Reaction affects, filters and compose the process such as drift correction.The all-round spectral coverage of described pretreated inelastic scattering gamma spectra is entered
Row normalized, it is thus achieved that the inelastic scattering gamma spectra data after normalized.In the embodiment of the present application, at normalization
Reason is to count the power spectrum of whole energy section to add up, then calculates per pass divided by power spectrum calculating cumulative, so that after normalization
Data are between 0～1, and the gamma-spectrometric data sum of whole energy section is 1.Normalized is the qualitative meter of the magnesium elements after making process
Calculation value can reflect the change of whole well section.In the embodiment of the present application, by the inelastic scattering gamma spectra after normalized
Data may determine that the Gama Count of the energy window of reflection magnesium elements.
S4, all-round spectral coverage to described pretreated inelastic scattering gamma spectra are normalized, it is thus achieved that return
Inelastic scattering gamma spectra data after one change process.
In the embodiment of the present application, by reflection magnesium elements energy window in gamma spectra count, such that it is able to realize right
The qualitative evaluation of magnesium elements, can obtain the relative amount delta data of magnesium elements, in prior art by qualitative evaluation, although
Resolved the absolute value that can obtain stratum magnesium element content by power spectrum, but first pretreated gamma spectra is carried out spectrum unscrambling
Process is more complicated, needs to carry out the data handling procedure of complexity；Secondly power spectrum resolving needs to utilize standard power spectrum number
According to, and standard gamma-spectrometric data needs professional to utilize logger to measure acquisition in master scale tank, acquisition process is loaded down with trivial details；
After power spectrum resolves and obtains element relative yield simultaneously, in addition it is also necessary to just can obtain unit after relative yield is carried out volume of data conversion
Cellulose content, therefore, prior art data handling procedure is extremely complex, is also required to professional and technical personnel simultaneously and resolves.The application is real
Execute example to be counted by the gamma spectra in the energy window of reflection magnesium elements, the magnesium elements of formation at target locations is carried out qualitative evaluation, from
And the relative amount delta data of magnesium elements can reflect limestone and dolomitic change in the formation at target locations obtained, the most existing
There is technology, after the embodiment of the present application is by carrying out pretreatment to gamma spectra, obtain the gamma spectra in reflection magnesium elements energy window
Counting just can evaluate stratum magnesium element content qualitatively, it is not necessary to complicated spectrum unscrambling process, it is not necessary to the standard during spectrum unscrambling
Gamma spectra, it is not required that the complex process that element relative yield is changed to constituent content.The method computing of the embodiment of the present application
Measure little, the most efficiently, it is possible to achieve the qualitative evaluation to stratum magnesium elements, accurately determine such that it is able to meet in carbonate formation
Property distinguish limestone and dolomitic demand.
In the embodiment of the present application, before step S5, also include:
Adjust the data weighting of described gamma spectra counting, it is thus achieved that the gamma spectra counting after adjustment；
Corresponding, count the magnesium elements to described formation at target locations according to the gamma spectra after described adjustment and carry out qualitative commenting
Valency, obtains the relative amount delta data of magnesium elements in described formation at target locations.
In the embodiment of the present application, the gamma spectra count value in the energy window of reflection magnesium elements is the least, therefore
Data fluctuations is the least, and by adjusting data variation weight, such that it is able to increase data fluctuations, follow-up determines
Property evaluate.In the application one embodiment, the data weighting adjusting described gamma spectra counting can be by reflection magnesium elements energy
Gamma spectra counting unification in window amplifies certain multiple after deducting certain radix again, thus increases the energy of described reflection magnesium elements
The undulatory property of gamma spectra counting in amount window.
In the embodiment of the present application, by the inelastic scattering gamma spectra data of the formation at target locations obtained are carried out pretreatment
And normalized, obtain the gamma spectra counting in the energy window of reflection magnesium elements, then by reflecting the energy of magnesium elements
Gamma spectra counting in window achieves the fast qualitative evaluation of stratum magnesium elements, obtains stratum magnesium elements relative amount change
Data.The energy spectrum analysis of hinge structure, the method for the embodiment of the present application make use of inelastic scattering gamma spectra data
Process, then utilize the Gama Count direct qualitative evaluation stratum magnesium element content that can reflect in magnesium elements energy window, this Shen
Please the method for embodiment simple, operand is little, it is achieved that the fast qualitative evaluation of stratum magnesium elements, meets carbonate formation
Middle differentiation limestone and dolomitic demand.
In order to the beneficial effect of the embodiment of the present application is clearly described, it is exemplified below:
Fig. 2 is to study fast qualitative in the embodiment of the present application to evaluate the rock physics volume-based model that stratum magnesium elements sets
1.As it can be seen, rock physics volume-based model 1 includes 5 parts: calcite 201, dolomite 202, quartz 203, kaolinite 204 and
Kerogen 205.
Fig. 3 is to study fast qualitative in the embodiment of the present application to evaluate the Monte Carlo simulation calculating that stratum magnesium elements sets
Model schematic, simulation design conditions are: the pulsed neutron source 311 in pulsed neutron stratum element logger 31 uses D-T
Pulsed neutron generator, pulsed neutron generator pulse width is 40 μ s, and shield 312 material is tungsten, and gamma detector 313 is adopted
With bromination billows crystal, the distance between pulsed neutron source 311 and gamma detector 313 is 35cm；Wellbore fluid 32 is fresh water, well
The a diameter of 20cm of eye；It is cylindrical for measuring stratum 33, and radial thickness and height are respectively 90cm and 150cm.
Utilize the Monte Carlo simulation computation model shown in Fig. 3, set according to the rock volume physical model shown in Fig. 2 and survey
Amount stratum 33, wherein: calcite 201, dolomite 202, quartz 203, kaolinite 204 and the volume basis score of kerogen 205
It is not 30%, 30%, 10%, 20% and 10%, sets the time window of record gamma spectra as 0～40 μ s, utilize neutron to block
Method analog record inelastic scattering gamma spectra, as shown in Figure 4.
Fast neutron reacts with magnesium elements atomic nucleus generation inelastic scattering mainly 4 characteristic gamma energy peaks, and its energy is:
1.36MeV, 1.8MeV, 2.75MeV and 4.23MeV.From fig. 4, it can be seen that energy is on inelastic scattering gamma spectra
Two characteristic gamma energy peaks of the magnesium elements of 1.36MeV and 4.23MeV are inconspicuous, and therefore the two characteristic gamma energy peak is not suitable for
For reflecting stratum magnesium element content；Owing to fast neutron can produce energy with element silicon atomic nucleus generation inelastic scattering reaction it is
The characteristic gamma ray of 1.8MeV, and many, so energy be bigger than magnesium in cross section of element silicon generation inelastic scattering reaction
The characteristic gamma energy peak of the magnesium elements of 1.78MeV is affected the biggest 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 of the calcium constituent that energy is 3.74MeV
The impact of second escape peak at peak；Comparatively speaking, energy is that the characteristic gamma energy peak of magnesium elements of 2.75MeV is at the 4 of magnesium elements
Individual characteristic gamma energy peak is affected minimum by other gamma energy peaks.Therefore can draw, utilize the magnesium elements that energy is 2.75MeV
Characteristic gamma energy peak reflection magnesium element content be better than the characteristic gamma energy peak of other energy.Therefore, in the embodiment of the present application
Determine with reflection stratum, the inelastic scattering characteristic gamma energy peak magnesium element content of the magnesium elements that energy is 2.75MeV.
The scope at the inelastic scattering characteristic gamma energy peak according to the magnesium elements that energy in Fig. 4 is 2.75MeV, selectes this
For reflecting that the energy window of stratum magnesium elements is 2.63-2.84MeV in bright.
Utilize the feasibility of gamma spectra counting reflection stratum magnesium elements in 2.63-2.84MeV energy window for checking, set
Rock physics volume-based model 2 as shown in Figure 5.As it can be seen, rock physics volume-based model 2 includes two parts: dolomite 501 He
Hole 502.
Utilize the Monte Carlo simulation computation model shown in Fig. 3, set according to the rock volume physical model shown in Fig. 5 and survey
Amount stratum 33, is full of oil in hole 502, set the percent by volume of hole 502 be respectively 0,5%, 10%, 15%, 20%,
25%, 9 kinds of Different Strata models of 30%, 35% and 40%, set the time window of record gamma spectra as 0～40 μ s, utilization
Inelastic scattering gamma spectra gamma spectra under the conditions of 9 kinds of Different Strata of neutron method for cutting analog record, obtains reflecting magnesium
In the 2.63-2.84MeV energy window of element, the relation of gamma spectra counting and magnesium element content is as shown in Figure 6.
From fig. 6, it can be seen that gamma spectra counts along with magnesium in the 2.63-2.84MeV energy window of reflection stratum magnesium elements
The increase of constituent content constantly increases, and presents good linear relationship with magnesium element content.Therefore, utilization is demonstrated further
The feasibility of gamma spectra counting reflection stratum magnesium elements in 2.63-2.84MeV energy window.
Fig. 7 is at the stratum element well-log information measuring the 3840-3880 rice well section of Sichuan X well of the embodiment of the present application
The fast qualitative that reason obtains evaluates the result map of stratum magnesium elements.Plant from Fig. 7 it can be seen that the present invention processes the stratum magnesium obtained
Element fast qualitative evaluation result variation tendency utilizes complicated power spectrum resolving to obtain stratum magnesium unit in logging well with stratum element
Cellulose content variation tendency is basically identical, and both reach 0.95 by dependency.
As shown in Figure 8, the embodiment of the present application additionally provides the device of a kind of stratum magnesium elements qualitative evaluation, and described device is also
Including:
Number acquiring unit 21, for obtaining the inelastic scattering gamma spectra data of formation at target locations；
Energy window determines unit 22, for determining the non-of reflection magnesium elements according to described inelastic scattering gamma spectra data
Elastic scattering characteristic gamma ray energy, and determine therefrom that the energy window of reflection magnesium elements；
Gamma spectra counting acquiring unit 23, for according to described inelastic scattering gamma spectra data, obtain described instead
Reflect the gamma spectra counting in the energy window of magnesium elements；
Qualitative evaluation unit 24, for carrying out qualitative according to described gamma spectra counting to the magnesium elements of described formation at target locations
Evaluate, obtain the relative amount delta data of magnesium elements in described formation at target locations.
Each ingredient of the device of the present embodiment is respectively used to realize each step of the method for previous embodiment, due to
In embodiment of the method, each step is described in detail, has not repeated them here.
In the embodiment of the present application, by the inelastic scattering gamma spectra data of the formation at target locations obtained are carried out pretreatment
And normalized, obtain the gamma spectra counting in the energy window of reflection magnesium elements, then by reflecting the energy of magnesium elements
Gamma spectra counting in window achieves the fast qualitative evaluation of stratum magnesium elements, obtains stratum magnesium elements relative amount change
Data.The energy spectrum analysis of hinge structure, the method for the embodiment of the present application make use of inelastic scattering gamma spectra data
Process, then utilize the Gama Count direct qualitative evaluation stratum magnesium element content that can reflect in magnesium elements energy window, this Shen
Please the method for embodiment simple, operand is little, it is achieved that the fast qualitative evaluation of stratum magnesium elements, meets carbonate formation
Middle differentiation limestone and dolomitic demand.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present application can be at hardware, soft
The combination in any of part, firmware or this three realizes.If realized in software, these functions can store and computer-readable
On medium, or it is transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes electricity
Brain stores medium and is easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium is permissible
It is that any general or special computer can be with the useable medium of access.Such as, such computer readable media can include but
It is not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other
What may be used for carrying or storage can be by general or special computer or general or special handling with other with instruction or data structure
Device reads the medium of the program code of form.
Particular embodiments described above, has been carried out the most in detail purpose, technical scheme and the beneficial effect of the application
Describe in detail bright, be it should be understood that the specific embodiment that the foregoing is only the embodiment of the present application, be not used to limit this Shen
Protection domain please, all within spirit herein and principle, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in the protection domain of the application.
Claims (12)
1. the method for a stratum magnesium elements qualitative evaluation, it is characterised in that described method includes:
Obtain the inelastic scattering gamma spectra data of formation at target locations；
The inelastic scattering characteristic gamma ray energy of reflection magnesium elements is determined according to described inelastic scattering gamma spectra data,
And determine therefrom that the energy window of reflection magnesium elements；
According to described inelastic scattering gamma spectra data, obtain the gamma spectra meter in the energy window of described reflection magnesium elements
Number；
According to described gamma spectra counting, the magnesium elements of described formation at target locations is carried out qualitative evaluation, obtain in described formation at target locations
The relative amount delta data of magnesium elements.
2. the method for stratum as claimed in claim 1 magnesium elements qualitative evaluation, it is characterised in that described reflection magnesium elements non-
Elastic scattering characteristic gamma ray energy is 2.75Mev.
3. the method for stratum as claimed in claim 2 magnesium elements qualitative evaluation, it is characterised in that the energy of described reflection magnesium elements
Amount window is 2.63～2.84MeV.
4. the method for stratum as claimed in claim 1 magnesium elements qualitative evaluation, it is characterised in that according to described inelastic scattering
Gamma spectra data, obtain the gamma spectra counting in the energy window of described reflection magnesium elements, including:
Described inelastic scattering gamma spectra data are carried out pretreatment, it is thus achieved that pretreated inelastic scattering gamma spectra number
According to；
Described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that non-resilient after normalized
Scattering gamma spectra data；
According to the inelastic scattering gamma spectra data after described normalized, obtain in the energy window of described reflection magnesium elements
Gamma spectra counting.
5. the method for stratum as claimed in claim 4 magnesium elements qualitative evaluation, it is characterised in that to described pretreated non-
Elastic scattering gamma spectra is normalized, it is thus achieved that the inelastic scattering gamma spectra data after normalized, including:
The all-round spectral coverage of described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalized
After inelastic scattering gamma spectra data.
6. the method for stratum as claimed in claim 1 magnesium elements qualitative evaluation, it is characterised in that according to described gamma spectra
Count the magnesium elements to described formation at target locations and carry out qualitative evaluation, obtain the relative amount change of magnesium elements in described formation at target locations
Before data, also include:
Adjust the data weighting of described gamma spectra counting, it is thus achieved that the gamma spectra counting after adjustment；
Corresponding, count the magnesium elements to described formation at target locations according to the gamma spectra after described adjustment and carry out qualitative evaluation, obtain
Take the relative amount delta data of magnesium elements in described formation at target locations.
7. the device of a stratum magnesium elements qualitative evaluation, it is characterised in that described device includes:
Acquiring unit, for obtaining the inelastic scattering gamma spectra data of formation at target locations；
Energy window determines unit, for determining that the non-resilient of reflection magnesium elements dissipates according to described inelastic scattering gamma spectra data
Penetrate characteristic gamma ray energy, and determine therefrom that the energy window of reflection magnesium elements；
Gamma spectra counting acquiring unit, for according to described inelastic scattering gamma spectra data, obtains described reflection magnesium unit
Gamma spectra counting in the energy window of element；
Qualitative evaluation unit, for the magnesium elements of described formation at target locations being carried out qualitative evaluation according to described gamma spectra counting,
Obtain the relative amount delta data of magnesium elements in described formation at target locations.
8. the device of stratum as claimed in claim 7 magnesium elements qualitative evaluation, it is characterised in that described reflection magnesium elements non-
Elastic scattering characteristic gamma ray energy is 2.75Mev.
9. the device of stratum as claimed in claim 8 magnesium elements qualitative evaluation, it is characterised in that the energy of described reflection magnesium elements
Amount window is 2.63～2.84MeV.
10. the device of stratum as claimed in claim 7 magnesium elements qualitative evaluation, it is characterised in that described gamma spectra counts
Acquiring unit includes:
Pretreatment subelement, for carrying out pretreatment to described inelastic scattering gamma spectra data, it is thus achieved that pretreated non-
Elastic scattering gamma spectra data；
Normalized subelement, for being normalized described pretreated inelastic scattering gamma spectra, obtains
Obtain the inelastic scattering gamma spectra data after normalized；
Gamma spectra count sub-element, for according to the inelastic scattering gamma spectra data after described normalized, obtains
Gamma spectra counting in the energy window of described reflection magnesium elements.
The device of 11. stratum as claimed in claim 10 magnesium elements qualitative evaluations, it is characterised in that to described pretreated
Inelastic scattering gamma spectra is normalized, it is thus achieved that the inelastic scattering gamma spectra data after normalized, bag
Include:
The all-round spectral coverage of described pretreated inelastic scattering gamma spectra is normalized, it is thus achieved that normalized
After inelastic scattering gamma spectra data.
The device of 12. stratum as claimed in claim 7 magnesium elements qualitative evaluations, it is characterised in that described device also includes:
Data weighting adjustment unit, for adjusting the data weighting of described gamma spectra counting, it is thus achieved that the gamma spectra after adjustment
Counting；
Corresponding, described qualitative evaluation unit for counting the magnesium to described formation at target locations according to the gamma spectra after described adjustment
Element carries out qualitative evaluation, obtains the relative amount delta data of magnesium elements in described formation at target locations.
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| CN103760182A (en) * | 2014-01-02 | 2014-04-30 | 中国石油天然气股份有限公司 | Method and device for evaluating abundance of organic matter of hydrocarbon source rock |
| 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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