A Method of Improving the Accuracy of Determining Element Content by Element Logging Technology
A technology of element logging and element content, which is applied in the direction of measuring devices, geophysical measurement, nuclear radiation exploration, etc., can solve the problem that the calculation accuracy of element content will be affected, and achieve the effect of overcoming the influence and improving the accuracy
Active Publication Date: 2020-02-04
LANZHOU UNIVERSITY
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Problems solved by technology
Using a fixed set of element standard spectrum to process measurement energy spectrum data, the accuracy of element content calculation will be affected
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[0031] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0032] Such as Figure 1-Figure 3 As shown, a method for improving the accuracy of element content determination by element logging technology includes:
[0033] Among them, both the skeleton and the filling material are composed of the simulated stratum, the stratum simulated by the skeleton is richer, and the stratum simulated by the filling material is relatively simple.
[0034] a. Build the calibration tank of the element logging tool, wherein the middle of the calibration tank is annular, and add filling materials with known element composition in the calibration tank. The filling material can be quartz sand, and the composition of quartz sand is 99% quartz, feldspar 1%.
[0035] b. Establish a numerical calculation model using the parameters of the element logging tool, filling material and calibration tank 7, wher...
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The invention discloses a method for improving the accuracy of determining element content by the elemental logging technology, and relates in particular to the field of oil and gas logging technology. The invention solves the problem that when the existing elemental logging technology is used to determine the element content, a fixed set of elemental standard spectra is utilized and the accuracyof the element content is affected. The method specifically includes: constructing an elemental logging instrument scale tank; constructing a numerical calculation model by using a numerical simulation method; improving a numerical simulation program to obtain a numerical calculation program capable of recording the reaction type, position, time, and released gamma ray energy of the effect betweenneutrons and formation elements; using the elemental logging instrument for measurement in the scale tank, and using the measured energy spectrum data for benchmark verification of the numerical calculation program; establishing multiple sets of element standard spectrum libraries under different logging conditions for the actual measurement data processing; and using the method of loop iterationto calculate fitting errors of different standard spectra, selecting a set of standard spectra with the smallest fitting error, and calculating skeleton elements.
Description
technical field [0001] The invention relates to the technical field of oil and natural gas logging, in particular to a method for improving the accuracy of element content determination by element logging technology. Background technique [0002] Element logging technology is a logging method that generates neutrons through a neutron source, uses inelastic scattering and radiation capture of neutrons and formation materials, collects gamma energy spectrum data generated by the action, and then determines the content of formation skeleton elements . At present, the main element logging tools mainly include ECS from Schlumberger, GEM from Halliburton, FleX from Baker Hughes and Lith Scanner from Schlumberger, FEM from PetroChina Logging Company, PNST from Daqing Oilfield Testing Service Company Wait. The element logging tool measures downhole, collects non-elastic and captured gamma energy spectra, uses the standard gamma energy spectrum library of elements to process the me...
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IPC IPC(8): G01V5/10
CPCG01V5/101
Inventor 刘军涛刘树才张锋李福生苗彬杨传乐张泉滢
Owner LANZHOU UNIVERSITY