A Gamma Spectrum Decoding Method and Device for Element Capture Spectroscopy Logging

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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