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Gamma ray spectra spectrum unfolding method and device for element capture spectrometry logging

A technology of gamma energy spectroscopy and element capture, which is applied in the field of gamma energy spectrum analysis and devices of element capture spectroscopy logging, can solve the problem of restricting the accuracy of neutron capture gamma energy spectrum analysis and the lack of actual downhole data Effective technical methods and other issues to achieve the effect of eliminating statistical fluctuations, eliminating burrs, and improving spectral resolution accuracy

Active Publication Date: 2018-08-28
PETROCHINA CO LTD
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Problems solved by technology

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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  • Gamma ray spectra spectrum unfolding method and device for element capture spectrometry logging
  • Gamma ray spectra spectrum unfolding method and device for element capture spectrometry logging
  • Gamma ray spectra spectrum unfolding method and device for element capture spectrometry logging

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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 ray spectra spectrum unfolding method and device for element capture spectrometry logging. The spectrum unfolding method comprises the steps that first, data obtained byan element capture spectrometry logger are preprocessed; then through the theoretical analysis and numerical calculation of spectral shapes, characteristic peak tracks, and backgrounds of different elements, and a main element group and an auxiliary element group are constructed according to the degree of interaction between the elements; then the least square method is used for unfolding the spectrum based on the construction of the main element group and the auxiliary element group; and finally, the yield of each element obtained by the least square method is reconstructed by theory, and the measured gamma ray spectrum and the reconstructed gamma ray spectrum are compared for error control to improve the accuracy of spectral unfolding. The spectrum unfolding method has the advantages ofhigh accuracy and high operability, has good universality for different types of reservoirs, and at the same time, an important reference significance for processing of neutron gamma ray spectrum data of other types of instruments is provided.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00G01V5/101Y02A90/30
Inventor 武宏亮李宁冯周兰长林吕韬王克文冯庆付
Owner PETROCHINA CO LTD
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