CN108333637A - A method of it improving geochemical well logging technology and determines constituent content accuracy - Google Patents
A method of it improving geochemical well logging technology and determines constituent content accuracy Download PDFInfo
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- CN108333637A CN108333637A CN201711338259.7A CN201711338259A CN108333637A CN 108333637 A CN108333637 A CN 108333637A CN 201711338259 A CN201711338259 A CN 201711338259A CN 108333637 A CN108333637 A CN 108333637A
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- well logging
- geochemical well
- constituent content
- geochemical
- scale tank
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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 nuclear radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/101—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
Abstract
The invention discloses a kind of methods that raising geochemical well logging technology determines constituent content accuracy, and in particular to petroleum and natural gas logging technique field.When determining constituent content which solve existing geochemical well logging technology, fixed a set of elemental standards spectrum, the affected deficiency of constituent content accuracy is utilized.This method specifically includes：Build geochemical well logging instrument scale tank；Mathematical calculation model is set up using method for numerical simulation；Numerical Simulation Program is improved, the reaction type for being able to record neutron and having an effect with stratum element, position, time and the program of numerical calculation for discharging gamma energy are obtained；It is measured in scale tank using geochemical well logging instrument, benchmark verification is carried out using gamma-spectrometric data logarithm calculation procedure is measured；More set elemental standards spectrum library under different well logging conditions is established for field data processing；Using the method for loop iteration, the error of fitting of various criterion spectrum is calculated, selects a set of standard spectrum of error of fitting minimum, calculates backbone element.
Description
Technical field
The present invention relates to petroleum and natural gas logging technique fields, and in particular to a kind of raising geochemical well logging technology determination member
The method of cellulose content accuracy.
Background technology
Geochemical well logging technology is that by neutron source neutron occurs for one kind, utilizes neutron and formation material that inelastic scattering occurs
And radiation capture effect, the gamma spectra data that acquisition effect generates, and then determine the logging method of stratum backbone element content.
Current main geochemical well logging instrument mainly has the ECS of Schlumberger, the GEM of Halliburton, the FleX of Bake Hughes and this human relations
The FEM of Lith Scanner, petrochina Logging Company that shellfish is thanked, the PNST etc. of Daqing oil field testing service company.Geochemical well logging
Instrument is measured in underground, by acquiring non-ballistic and capture gamma spectra, is handled and is surveyed using the standard gamma power spectrum library of element
Power spectrum is measured, and then formation skeleton element yield and content is calculated.Generally by scale tank or the method for numerical simulation, establish
The standard gamma power spectrum library of a set of stratum element.Schlumberger, Bake Hughes, petrochina Logging Company are formed by building
SiO2、CaCO3, the substances such as S scale bucket, obtain the standard power spectrum library of the elements such as Si, Ca.It can also be by numerical simulation side
Method establishes the stratigraphic model that stratum group corresponds to oxide as element, establishes a set of elemental standards gal for field data processing
Ma Nengpuku.
But in well logging, it can change such as formation porosity, density, well under the well logging condition of different depth points
Eye size, drilling fluid types etc..When above-mentioned well logging condition changes, the spatial flux distribution that neutron occurs for neutron source can be sent out
Changing.Therefore the generation position of inelastic scattering and capture gamma ray can change, and influence gamma ray and reach detection
The path of device.The shape of the standard gamma power spectrum of single element can be affected.If utilizing fixed a set of elemental standards gamma
Power spectrum library has handled actual measurement gamma spectra, can fix exactness really to constituent content and have an impact.
Patent No. US7366615 (04/2008), US5471057 (11/1995), US20110218735 (09/2011)
United States Patent (USP), Patent No. CN103696765 (11/2013), CN102084271 (06/2009), CN102518431 (06/
2012), the Chinese patent of CN104329075 (09/2014), CN105182422 (09/2015), CN105629319A.
The .PNST-E pulsed neutron formation element logging technology researchs such as Zheng Hua《Logging technique》.2015, volume 39 the (the 4th
Phase)
Geochemical well logging development course and technique prospects of the superfine of Yuan based on gamma spectra《Advances in Geophysics》
.2014, volume 29 (the 4th phase)
The shale gas-bearing formation pulsed neutron geochemical well logging Monte Carlo studies such as Liu Juntao《Logging technique》.2015, volume 39
(volume 5).
The such as Liu Juntao pulsed neutron geochemical well logging instrument MC benchmarks and standard of instruments spectrum analog [C] // China's nuclear science
Technical progress report .2013.
Above-mentioned patent or document describe the method that existing some elemental standards spectrum obtains and constituent content determines, wherein
He Biao, Liu Juntao et al. introduce a kind of method for establishing fixed a set of stratum element standard spectrum；In terms of constituent content determination, all
It is that fixed a set of elemental standards spectrum is utilized, but when well logging condition changes, such as borehole size, drilling mud type are not
Meanwhile the shape of elemental standards spectrum can change.Gamma-spectrometric data is measured using a set of elemental standards spectrum processing of fixation, element contains
Amount accuracy in computation can be affected.
Deficiency existing for constituent content is determined for above-mentioned existing geochemical well logging, is passed through invention describes one kind and being established more sets
It is true to improve geochemical well logging technology for elemental standards gamma spectra library under the conditions of Different Strata, the method calculated using loop iteration
Determine a kind of method of constituent content accuracy.
Invention content
The purpose of the present invention is against the above deficiency, it is proposed that a kind of element by establishing under the conditions of more covering Different Stratas
Standard gamma power spectrum library, the method calculated using loop iteration improve the side that geochemical well logging technology determines constituent content accuracy
Method.
The present invention specifically adopts the following technical scheme that：
A method of it improving geochemical well logging technology and determines constituent content accuracy, specifically include：
A. the scale tank of geochemical well logging instrument is built, is annulus type wherein among scale tank, Known Elements is added in scale tank
The packing material of element composition；
B. geochemical well logging instrument, packing material and scale tank is used to set up mathematical calculation model, wherein packing material is filled into
In scale tank, geochemical well logging instrument is inserted into packing material；
C. Numerical Simulation Program is improved, the reaction type for recording neutron and having an effect with stratum element, position, time are obtained
And generate the program of numerical calculation of the energy of inelastic scattering and radiation capture gamma ray；
D. it is measured in scale tank using geochemical well logging instrument, journey is calculated using obtained gamma-spectrometric data logarithm is measured
Sequence carries out benchmark verification；
E. establish Different porosities, borehole size, drilling mud type or oil-gas possibility stratigraphic model, skeleton is respectively
The correspondence oxide of different elements is used to survey after obtaining more set leading element gamma spectra library storages under different well logging conditions
Data processing；
F. the method for using loop iteration is utilized respectively and covers different leading element gamma spectra library processing element well loggings more
Instrument measured spectrum data calculates the error of fitting iterated to calculate every time, selects a set of leading element gamma of error of fitting minimum
Power spectrum library is calculated each element yield of stratum, backbone element content is finally calculated.
Preferably, the geochemical well logging instrument includes shell and ground control system, in being sequentially connected with from bottom to top in shell
Component, Neutron shielding body, gamma crystal counter, photomultiplier, underground control and Acquisition Circuit and ground control system.
Preferably, leading element gamma spectra library includes Si, Ca, S, Fe, S, Ti, Gd, Cl, H, K and Al.
Preferably, the scale tank is horizontal, and outer shroud radius is more than 80cm, and inner ring radius is 10cm.
Preferably, the spectrum of the elemental standards under different well logging conditions can be calculated in the program of numerical calculation.
The present invention has the advantages that：
By this method, overcomes elemental standards spectral shape under different well logging conditions and change the shadow calculated constituent content
It rings, improves the accuracy that geochemical well logging technology determines constituent content.
Description of the drawings
Fig. 1 is the method flow schematic diagram for improving geochemical well logging technology and determining constituent content accuracy；
Fig. 2 is typical stratum geochemical well logging apparatus structure schematic diagram；
Fig. 3 is geochemical well logging instrument test graduation apparatus structural schematic diagram；
Fig. 4 is the Si elemental standards spectrum comparison under different well logging conditions.
Wherein, 1 is neutron source, and 2 be Neutron shielding body, and 3 be gamma crystal counter, and 4 be photomultiplier, and 5 be underground
Control and Acquisition Circuit, 6 be ground control system, and 7 be scale tank.
Specific implementation mode
The specific implementation mode of the present invention is described further in the following with reference to the drawings and specific embodiments：
As shown in Figure 1-Figure 3, a method of improving geochemical well logging technology and determine constituent content accuracy, specifically include：
Wherein, skeleton and packing material are the composed structure of simulated formation, and the stratum of skeleton simulation is more rich, fills material
Expect that the stratum of simulation is relatively easy.
A. the scale tank of geochemical well logging instrument is built, is annulus type wherein among scale tank, Known Elements is added in scale tank
The packing material of element composition, packing material can be quartz sand, and quartz sand group becomes quartz 99%, feldspar 1%.
B. the parameter of geochemical well logging instrument, packing material and scale tank 7 is used to set up mathematical calculation model, wherein packing material
It is filled into scale tank, packing material can be above-mentioned quartz sand, and geochemical well logging instrument is inserted into packing material；
Wherein, geochemical well logging instrument includes shell and ground control system, be sequentially connected with from bottom to top in shell neutron source 1,
Neutron shielding body 2, gamma crystal counter 3, photomultiplier 4, underground control and Acquisition Circuit 5 and ground control system 6.
C. it improves Numerical Simulation Program, obtains and be able to record reaction type when neutron is had an effect with stratum element, position
Set, the time and generate inelastic scattering and radiation capture gamma ray energy program of numerical calculation；
D. it is measured in scale tank using geochemical well logging instrument, journey is calculated using obtained gamma-spectrometric data logarithm is measured
Sequence carries out benchmark verification；
E. establish Different porosities, borehole size, drilling mud type or oil-gas possibility stratigraphic model (stratigraphic model
Porosity can take 0% respectively, 5%, 10%, 15%, 20%, 30%, 40%), skeleton is respectively the correspondence oxygen of different elements
Compound establishes the stratigraphic model that wellbore radius is respectively 6cm, 8cm, 10cm, 12cm, 16cm；Establish drilling fluid be respectively fresh water,
The stratigraphic model of barite mud (water, barite, bentonite)；Finally obtain more set leading element gals under different well logging conditions
For real after Ma Nengpuku (leading element gamma spectra library includes Si, Ca, S, Fe, S, Ti, Gd, Cl, H, K and Al) storage
The processing of survey data；It is respectively the Si elemental standards spectrum obtained under the conditions of fresh water and barite mud to be illustrated in figure 4 wellbore fluid,
It can be seen that well logging condition difference produces influence to elemental standards spectral shape.
F. the method for using loop iteration is utilized respectively and covers different leading element gamma spectra library processing element well loggings more
Instrument measured spectrum data calculates the error of fitting iterated to calculate every time, selects a set of leading element gamma of error of fitting minimum
Power spectrum library is calculated each element yield of stratum, backbone element content is finally calculated.
It is utilized respectively the present invention and current geochemical well logging processing method (is based on a set of fixed element standard spectrum and oxide
Model carries out constituent content conversion), processing formation skeleton group becomes SiO2、Al2O3, MgO and FeO, drilling mud it is respectively light
When water and barite mud, the capture gamma spectra data that the apparatus measures on stratum obtain, and calculate formation skeleton constituent content.
During calculating elements content, existing constituent content is respectively adopted and determines that method and the method for the present invention, the element of the two contain
It measures result of calculation and actual comparison is as shown in table 1.
Table 1
As can be seen from Table 1, the geochemical well logging apparatus measures power spectrum number under different well logging conditions is handled using existing method
According to the accuracy in computation of constituent content is impacted.Formation skeleton constituent content accuracy is calculated using the method for the present invention to be carried
It is high.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention should also belong to the present invention's
Protection domain.
Claims (5)
1. a kind of method for improving geochemical well logging technology and determining constituent content accuracy, which is characterized in that specifically include：
A. the scale tank of geochemical well logging instrument is built, is annulus type wherein among scale tank, known element group is added in scale tank
At packing material；
B. geochemical well logging instrument, packing material and scale tank parameter is used to set up mathematical calculation model, wherein packing material is filled into
In scale tank, geochemical well logging instrument is inserted into packing material；
C. improve Numerical Simulation Program, obtain be able to record reaction type when neutron is had an effect with stratum element, position, when
Between and generate inelastic scattering and radiation capture gamma ray energy program of numerical calculation；
D. measured in scale tank using geochemical well logging instrument, using measure obtained gamma-spectrometric data logarithm calculation procedure into
Row benchmark is verified；
E. establish Different porosities, borehole size, drilling mud type or oil-gas possibility stratigraphic model, skeleton be respectively difference
The correspondence oxide of element is used for field data after obtaining more set leading element gamma spectra library storages under different well logging conditions
Processing；
F. the method for using loop iteration is utilized respectively and covers different leading element gamma spectra library processing element logging instrument realities more
Power spectrum data is surveyed, the error of fitting iterated to calculate every time is calculated, selects a set of leading element gamma spectra of error of fitting minimum
Library is calculated each element yield of stratum, backbone element content is finally calculated.
2. a kind of method for improving geochemical well logging technology and determining constituent content accuracy as described in claim 1, feature exist
In the geochemical well logging instrument includes shell and ground control system, and neutron source, neutron shield are sequentially connected with from bottom to top in shell
Body, gamma crystal counter, photomultiplier, underground control and Acquisition Circuit and ground control system.
3. a kind of method for improving geochemical well logging technology and determining constituent content accuracy as claimed in claim 1 or 2, feature
It is, leading element gamma spectra library includes Si, Ca, S, Fe, S, Ti, Gd, Cl, H, K and Al.
4. a kind of method for improving geochemical well logging technology and determining constituent content accuracy as described in claim 1, feature exist
In the scale tank is horizontal, and outer shroud radius is more than 80cm, and inner ring radius is 10cm.
5. a kind of method for improving geochemical well logging technology and determining constituent content accuracy as described in claim 1, feature exist
In the spectrum of the elemental standards under different well logging conditions can be calculated in the program of numerical calculation.
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Cited By (4)
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| CN109241644A (en) * | 2018-09-19 | 2019-01-18 | 中国矿业大学 | A kind of element yield calculation method for stratum element well logging |
| CN109740279A (en) * | 2019-01-14 | 2019-05-10 | 东华理工大学 | A kind of electrically controllable neutron Analysis of Gamma Energy Spectrum method in characteristic frequency spectrum library |
| CN109814147A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | Use the method for gamma activity Nuclear analysis around detector plus decaying bulk measurement aperture |
| CN115267928A (en) * | 2022-09-28 | 2022-11-01 | 中石化经纬有限公司 | Intelligent energy spectrum processing method for logging while drilling element |
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| CN115267928A (en) * | 2022-09-28 | 2022-11-01 | 中石化经纬有限公司 | Intelligent energy spectrum processing method for logging while drilling element |
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