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Anisotropy parameter inversion method based on orientation pre-stack seismic data

An azimuthal anisotropy and anisotropy technology, which can be used in seismology, seismic signal processing, geophysical measurement, etc., and can solve problems such as difficulty in inversion of anisotropic parameters.

Active Publication Date: 2017-06-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an anisotropic parameter inversion method based on pre-stack azimuth seismic data, mainly for unconventional reservoirs with fractures such as mud shale, and solve the problem that anisotropic parameter inversion is relatively difficult

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Embodiment Construction

[0044] The specific technical scheme of the invention is illustrated by an anisotropic parameter inversion method of a shale fractured reservoir work area in Shengli Oilfield.

[0045] An anisotropic parameter inversion method based on pre-stack azimuth seismic data, the method is as follows:

[0046] (1) Preprocessing of pre-stack azimuth seismic data for anisotropic features.

[0047] It is mainly to transform the pre-stack omni-directional seismic data into azimuth-specific angle data. First, according to the azimuth information of the omnidirectional data volume, the omnidirectional seismic data volume in the work area is divided according to the azimuth angle, and the azimuth angles are respectively 0-30°, 30°-60°, 60°-90°, 90°-120° , 120°-150°, 150°-180° seismic data of the same offset are superimposed, and the azimuth angles are 15°, 45°, 75°, 105°, 135°, 165° The prestack data volume of shift array. Then, according to the stacking velocity of each azimuth, the pre-s...

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Abstract

The invention discloses a reservoir anisotropy parameter inversion method based on orientation pre-stack seismic data. The method includes the steps: converting pre-stack all-dimensional seismic data into sub-dimensional partial angle stack data; pre-processing well logging data; estimating anisotropy parameters based on a rock physical model; calculating elastic reactance according to the orientation anisotropy parameters; extracting well-to-seismic calibration and orientation angle wavelets based on the orientation elastic reactance; inverting orientation anisotropy elastic reactance data bodies; extracting anisotropy parameters based on orientation anisotropy elastic reactance data to obtain longitudinal wave velocity, transverse wave velocity, densities and anisotropy parameters at any sampling site. According to the method, a pre-stack elastic reactance inverting method for orientation anisotropy characteristics is built according to orientation differences caused by mud-shale fractured reservoirs and AVO (amplitude variation with offset) effects, anisotropy parameters reflecting the characteristics of the mud-shale fractured reservoirs are acquired, and the problem of anisotropy parameter inversion of the mud-shale fractured reservoirs is solved.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration data processing of unconventional oil and gas resources, in particular to an anisotropic parameter inversion method based on pre-stack azimuth seismic data. [0002] technical background [0003] Due to the economic benefits brought by unconventional oil and gas resources and the changes in the world's energy pattern, the target of oil and gas exploration has gradually shifted to unconventional reservoirs such as tight sandstone and shale. In my country, unconventional oil and gas resources such as mud shale are abundant and have huge economic value. On the other hand, the long production cycle is also a remarkable feature of unconventional reservoirs such as shale gas, which means that their development and utilization value is great. Since unconventional reservoirs such as shale often develop nearly vertically arranged fractures, such reservoirs can be equivalent to HTI media acco...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/612G01V2210/6222G01V2210/6224G01V2210/6226
Inventor 王兴谋李红梅魏文曹丹平江洁王凡剑王树刚王红董娜宫红波
Owner CHINA PETROLEUM & CHEM CORP
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