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Fracture inversion method and device based on diffracted wave energy

A diffracted wave and energy technology, applied in the field of fracture inversion based on diffracted wave energy, can solve problems such as weak diffracted wave energy, distinguishing fractures, and inconvenience in oil and gas exploration and production

Active Publication Date: 2020-06-09
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0003] At present, diffracted waves are an effective means to characterize fractures, but compared with reflected waves, the energy of diffracted waves is very weak, so conventional seismic methods have poor prediction results for fracture attributes, and it is impossible to distinguish fractures by fracture attributes. Fluid-containing characteristics are inconvenient for oil and gas exploration and production

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  • Fracture inversion method and device based on diffracted wave energy
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  • Fracture inversion method and device based on diffracted wave energy

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[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] As early as the 1970s, people began to use seismic methods to predict fractures, such as shear wave splitting theory (Crampin, 1978; Alford, 1986), post-stack attributes such as curvature body and ant body, pre-stack amplitude with offset Amplitude variation with offset (AVO), AVAZ, VVAZ and other inversion methods, these methods can realize the qualitative description of frac...

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Abstract

The invention provides a fracture inversion method and device based on diffracted wave energy, and relates to the technical field of fracture prediction. The method comprises the steps: obtaining diffracted wave energy through separation from seismic data, wherein the diffracted wave energy comprises pre-stack diffracted wave energy and post-stack diffracted wave energy; determining an initial model of crack attributes according to the post-stack diffracted wave energy; taking the pre-stack diffracted wave energy and the initial model as input data, performing inversion through the following steps until the value of an inversion target function meets expectation, and taking the initial model as an inverted fracture attribute: inputting the input data into the inversion target function to obtain the value of the inversion target function; if the value of the inversion target function does not meet the expectation, adjusting the initial model data, taking the pre-stack diffracted wave energy and the adjusted initial model as new input data, and performing inversion through the diffracted wave energy of the crack to obtain a crack attribute parameter, thereby achieving the purpose of predicting the oil-gas condition of the crack.

Description

technical field [0001] The invention relates to the technical field of fracture prediction, in particular to a fracture inversion method and device based on diffracted wave energy. Background technique [0002] Fractured reservoirs are an important target of oil and gas exploration, and the nature of fractures is an important factor in exploration planning and drilling control. [0003] At present, diffracted waves are an effective means to characterize fractures, but compared with reflected waves, the energy of diffracted waves is very weak, so conventional seismic methods have poor prediction results for fracture attributes, and it is impossible to distinguish fractures by fracture attributes. The fluid-containing feature is inconvenient for oil and gas exploration and production. Contents of the invention [0004] The purpose of the present invention is to provide a fracture inversion method and device based on diffracted wave energy, through the diffracted wave energy...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/50
CPCG01V1/30G01V1/50
Inventor 李冬彭苏萍崔晓芹卢勇旭郭银玲
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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