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High-resolution thin and interbedded reservoir gas containing performance detection method

A detection method and gas-bearing technology, applied in the field of oil and natural gas exploration and development, can solve the problem of inability to accurately describe thin interlayers, achieve high time-frequency spectral resolution and precision, and improve resolution.

Inactive Publication Date: 2018-03-02
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that existing detection techniques cannot accurately describe thin interbeds (thin interbedded reservoirs), and provide a method for detecting gas-bearing properties of thin interbedded reservoirs using dispersion attenuation attributes

Method used

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  • High-resolution thin and interbedded reservoir gas containing performance detection method
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  • High-resolution thin and interbedded reservoir gas containing performance detection method

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Embodiment 1

[0026] Embodiment 1: This embodiment provides a high-resolution method for detecting gas-bearing properties of thin interbedded reservoirs, which includes the following steps:

[0027] S100: Obtain the seismic signal in the target detection area, and use the generalized S transform to obtain the time spectrum of the seismic signal; the generalized S transform formula is:

[0028]

[0029] Among them, τ represents the time in the time-frequency plane, f represents the frequency, λ, p are the adjustment parameters of the Gaussian window, GST(τ, f) represents the time-frequency data of the seismic signal, and x(t) represents the seismic signal.

[0030] S200: Carry out linearization processing to the time spectrum obtained in S100 to obtain the attenuation gradient; the steps of linearization processing include:

[0031] The maximum amplitude in the spectrum when searching, and record its corresponding frequency as the starting frequency f s ;

[0032] The minimum amplitude ...

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Abstract

The invention relates to the field of petroleum and natural gas exploration and development, and especially relates to a high-resolution thin and interbedded reservoir gas containing performance detection method. The thin and interbedded reservoir gas containing performance detection method provided by the invention acquires a time-frequency spectrum of collected seismic signals through adopting generalized S transform. Compared with time-frequency conversion performed according to the traditional method, the method provided by the invention has higher time-frequency spectrum resolution and accuracy. Meanwhile, the thin and interbedded reservoir gas containing performance detection method combines a method of performing linear processing on the amplitude between a starting frequency fs andan ending frequency fe, thereby avoiding an operation of performing direct fitting by using data of a segment with the frequency f being greater than the starting frequency fs and less than the ending frequency fe to solve the slope, and greatly improving the resolution, which is reflected by the seismic signals, in the longitudinal direction of a target detection area.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a high-resolution detection method for gas-bearing properties of thin interbedded reservoirs. Background technique [0002] In the field of oil and natural gas exploration, with the increase of exploration depth and exploration area, the problems faced by exploration are becoming more and more complex, and the detection of gas-bearing properties of thin inter-reservoirs is one of the difficult problems; currently, post-stack Gas-bearing detection is mostly based on frequency analysis, and the most common methods are spectral decomposition, amplitude energy analysis, and amplitude attenuation gradient analysis of the detection wave. However, it is inaccurate to calculate the reflection wave attenuation for thin mutual reservoirs by using the above method. The main reason is that the longitudinal resolution of the frequency spectrum in the time-f...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V1/307G01V2210/624
Inventor 许多姜镭钱玉贵赵迪吴清杰蒋能春董霞吕其彪
Owner CHINA PETROLEUM & CHEM CORP
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