A method for comprehensive interpretation of remaining oil saturation by pulsed neutron full-spectrum logging
A technology of pulsed neutrons and remaining oil, which is applied in the direction of measurement, measuring devices, earthwork drilling and production, etc., can solve the problems of single interpretation of remaining oil saturation, low coincidence rate of interpretation results and measures, and improve interpretation accuracy, The effect of improving the matching rate
Active Publication Date: 2022-06-17
DAQING OILFIELD CO LTD +1
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[0007] The present invention provides a method for comprehensively interpreting remaining oil saturation in pulsed neutron full-spectrum logging to overcome the problem of only providing a single interpretation of remaining oil saturation in the prior art, resulting in interpretation results and measure effects under complex logging conditions Defects with a low compliance rate
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[0041] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
[0042] like figure 1 As shown, the present invention provides a method for comprehensively interpreting remaining oil saturation by pulsed neutron full spectrum logging, including:
[0043] Step S1, go down the pulsed neutron logging tool, perform N (N is a positive integer) pass logging upward, and measure inelastic energy spectrum, capture energy spectrum, PNC time spectrum and PNN time spectrum for each logging; The pulsed neutron logging tool includes at least one gamma detector and one neutron detector.
[0044] Step S2: Perform lateral filtering on the inelastic energy spectrum and the captured energy spectrum obtained by N-pass logging, and perform vertical accumulation on the filtered energy spectrum; perform vertical accumulation on the PNC time spectrum and PNN time spectrum obtained by N-pass logging, Its accumulated points are consistent w...
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The invention relates to the technical field of oil well detection, in particular to a method for comprehensively interpreting remaining oil saturation in pulsed neutron full-spectrum well logging. The method includes: running the pulse neutron logging tool into the well, and measuring the inelastic energy spectrum, the capture energy spectrum, the PNC time spectrum and the PNN time spectrum for each logging; the PNC time spectrum and the PNN time spectrum obtained by N passes Carry out vertical accumulation, and the accumulated points are consistent with the energy spectrum; C / O, Cl / H, PNC, C / H, PNN, and TOC obtained from N loggings are used to interpret the remaining oil saturation N times respectively, and the same depth Calculate the overall variance of the interpretation results obtained by the six interpretation methods of the point; calculate the sensitivity of the six interpretation methods; calculate the weight of the remaining oil saturation interpretation results accounted for by the six interpretation methods; calculate the comprehensive interpretation of the remaining oil saturation. Using this comprehensive interpretation method, the accuracy of remaining oil saturation interpretation under complex logging conditions can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of oil well detection, in particular to a method for comprehensive interpretation of residual oil saturation by pulsed neutron full spectrum logging. Background technique [0002] The pulsed neutron logging technology can simultaneously complete the formation elements, dual-source carbon-to-oxygen ratio (C / O), chlorine spectrum, neutron lifetime (PNC+PNN), energy spectrum water flow and other projects in one well logging in cased wells. Interpret formation lithology and mineral composition, shale content, porosity, saturation and other information, identify gas layers, indicate high-pressure water-producing layers, and are mainly used for remaining oil and gas monitoring. [0003] Interpretation of remaining oil by pulse neutron logging technology includes six interpretation methods, (1) C / O interpretation method, which uses the relative content of carbon and oxygen in the formation to explain remaining oil;...
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IPC IPC(8): E21B47/00E21B49/00G01V5/10
CPCE21B47/00E21B49/00G01V5/10
Inventor 郑华孙亮何巍巍刘辉王丹邓茜珊刘开天王敏张馨元卿笃庆
Owner DAQING OILFIELD CO LTD