A Gamma Spectrum Decoding Method and Device for Element Capture Spectroscopy Logging
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A technique for gamma spectroscopy and element capture
Active Publication Date: 2020-04-10
PETROCHINA CO LTD
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At the same time, the interaction between elements in different formations also restricts the resolution accuracy of the neutron capture gamma spectrum
[0003]In the past, although scholars have carried out research on the solution method of element capture spectroscopy logging, they mainly focused on numerical simulation and theoretical elaboration, and did not provide information on actual downhole data. Effective technical method, so it has not been applied in actual production
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Embodiment 1
[0080] This embodiment provides a gamma spectrum analysis method for elemental capture spectroscopy logging, which may include the following steps:
[0081] 1. Acquisition of total element gamma energy spectrum measurement spectrum and determination of distribution types of main elements in the study area
[0082] The element capture gamma spectrum logging tool was used to log the 3230-3270m reservoir section of Well DAS3 in Daqing Oilfield to obtain the total gamma spectrum of formation elements at each depth point, that is, the element capture gamma spectrum logging data. Each depth point corresponds to a spectrum. Obtained and analyzed the whole-rock oxide analysis experiment results and mud logging data of DAS3 Well in Daqing Oilfield, and found that the reservoir section 3230m-3270m mainly includes Si, Ca, Al, Fe, S, K, Na, Mg, Ti, Gd, H and Ba elements, the oxides of these elements account for 98.9% of the rock weight percentage.
[0083] 2. Preprocessing the elemental...
Embodiment 2
[0117] This embodiment provides a gamma spectrum resolution device for elemental capture spectroscopy logging, which includes:
[0118] The data acquisition and main element type determination module is used to obtain and analyze the data of the research area, the data at least includes element capture gamma spectrum logging data and whole rock oxide analysis data, and determines the main element type of the block;
[0119] The element capture gamma spectrum logging data preprocessing module is used for preprocessing the element capture gamma spectrum logging data. Elastic scattering information is subtracted to obtain the preprocessed elemental capture gamma spectrum;
[0120] The main element group and auxiliary element group building block are used to construct the main element group and auxiliary element group composed of different elements, so as to clarify the sequence of spectral analysis of different elements;
[0121] The element group-based least square method despe...
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Abstract
The invention provides a gamma energy spectrum resolution method and device for element capture energy spectrum logging. The spectral analysis method first preprocesses the data obtained by the element capture spectroscopy logging tool; then, through theoretical analysis and numerical calculation of different element spectrum shapes, characteristic peaks and backgrounds, it is constructed according to the degree of interaction between elements. The main element group and auxiliary element group; and then use the least square method to solve the spectrum on the basis of the construction of the main and auxiliary element groups; finally, according to the least square method, the yield of each element obtained by solving the spectrum is reconstructed theoretically, and the measured The gamma energy spectrum is compared with the reconstructed gamma energy spectrum to control the error and improve the accuracy of spectrum resolution. The spectral solution method has the advantages of high precision and strong operability, and has good universality for different types of reservoirs. At the same time, it provides an important reference and reference for the processing of neutron gamma spectrum data of other types of instruments. Reference meaning.
Description
technical field [0001] The invention relates to a gamma energy spectrum resolution method and device for element capture energy spectrum logging, and belongs to the field of well logging technology in the field of oil and gas exploration. Background technique [0002] Elemental Capture Spectroscopy (ECS for short) logging tool is a new type of formation element logging tool introduced by Schlumberger to the Chinese market. Energy spectrum, the gamma energy spectrum contains the information of the main rock-forming elements Si, Ca, Fe, Al, S, Ti, H, Gd and other elements in the formation, providing a new way for the fine evaluation of complex reservoir lithology . The core of element capture spectroscopy logging interpretation is to use the standard spectrum of each element to calibrate the original measurement spectrum of the formation, and obtain the yield of various elements through spectrum resolution. The measurement spectrum obtained by the elemental capture energy sp...
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