Anisotropic Parameter Inversion Method Based on Azimuthal Prestack Seismic Data

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

Active Publication Date: 2021-04-16
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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  • Anisotropic Parameter Inversion Method Based on Azimuthal Prestack Seismic Data
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  • Anisotropic Parameter Inversion Method Based on Azimuthal Prestack Seismic Data

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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 reservoir anisotropy parameter inversion method based on azimuth pre-stack seismic data of the present invention includes converting pre-stack omni-directional seismic data into azimuth partial angle stacking data; logging data preprocessing; anisotropy based on rock physics model Anisotropic parameter estimation; Elastic impedance calculation for azimuth anisotropic characteristics; Well seismic calibration and azimuth angle wavelet extraction based on azimuth elastic impedance; Azimuth anisotropic elastic impedance data volume inversion; Azimuth anisotropic elastic impedance data based Extraction of anisotropy parameters to obtain the compressional wave velocity, shear wave velocity, density and anisotropy parameters at any sampling point. According to the azimuth difference and AVO effect of seismic data caused by shale fractured reservoirs, the present invention establishes a pre-stack elastic impedance inversion method for azimuthal anisotropy characteristics, and obtains anisotropic parameters reflecting the characteristics of shale fractured reservoirs , which solves the problem of inversion of anisotropy parameters in fractured shale reservoirs.

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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Patent Type & Authority Patents(China)
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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