Method and device for detecting gas content of reservoir

A detection method and detection device technology, applied in the direction of measuring devices, geophysical measurement, instruments, etc., can solve the problems of low detection accuracy, improve accuracy, meet the requirements of high-precision reservoir gas-bearing detection, and accurately indicate the reservoir The effect of layer gas

Inactive Publication Date: 2019-04-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the gas content of reservoirs, so as to solve the problem of low detection accuracy caused by the current detection of gas content by spectrum decomposition; the invention also provides a detection device for gas content of reservoirs

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  • Method and device for detecting gas content of reservoir
  • Method and device for detecting gas content of reservoir
  • Method and device for detecting gas content of reservoir

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Embodiment Construction

[0041] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] Embodiment of the method for detecting the gas content of the reservoir of the present invention

[0043] The reservoir gas-bearing property detection method of the present invention first performs empirical mode decomposition on the given seismic data to obtain its corresponding intrinsic mode section (IMF), and selects a suitable IMF section according to different seismic data qualities. Each record in the IMF profile is transformed by generalized S, and then superimposed to obtain the time-frequency profile, and then the time-frequency profile is frequency-divided to obtain high-frequency and low-frequency profiles, and the formation absorption profile is calculated, and the gas-bearing properties of the reservoir are identified according to the formation absorption profile . The implementation process of this method is as follows...

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Abstract

The invention relates to a method and device for detecting gas content of a reservoir, and belongs to the technical field of seismic exploration oil and gas detection. The method comprises the following steps: obtaining corresponding intrinsic function profiles (IMF) by empirical mode decomposition of the stacked seismic data, selecting the profile with the greatest correlation with the original seismic profile as an ideal intrinsic function profile, generalized S-transforming each record in the selected IMF profile, then superimposing the records to obtain a time-frequency profile, then dividing the time-frequency profile to obtain high-frequency and low-frequency profiles, calculating to obtain a formation absorption profile, and determining features of gas content of the reservoir by the formation absorption profile. The invention uses the empirical mode to decompose the seismic data to better reflect the underground geological information, and improve the detection accuracy of gascontent of the reservoir, and uses the spectral energy difference extracted by the high-precision generalized S transform to more accurately indicate the gas content of the reservoir, and meet the detection requirements of gas content of the high-precision reservoir.

Description

technical field [0001] The invention relates to a method and a device for detecting gas-bearing properties of reservoirs, and belongs to the technical field of seismic exploration oil and gas detection. Background technique [0002] With the comprehensive breakthrough and overall investment in development of shallow and middle oil and gas exploration in major basins in China, oil and gas reserves in major basins have gradually changed from shallow to deep, from large to small, and the exploration of deep targets has higher and higher requirements for reservoir prediction accuracy , which includes the accuracy of gas detection. Spectrum decomposition technology is one of the oil and gas detection methods adopted for medium and shallow exploration targets, among which short-time Fourier transform, wavelet transform and S transform are commonly used methods of spectrum decomposition technology, short-time Fourier transform, The spectral decomposition techniques of wavelet tran...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/24G01V1/36
CPCG01V1/24G01V1/362
Inventor 苏云蔡其新唐娟万晓兵黄蕾张成富杨爽刘欣欣
Owner CHINA PETROLEUM & CHEM CORP
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