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Method and device for identifying small-scale geologic body through diffraction refocusing

A refocusing and small-scale technology, applied in the field of seismic exploration, can solve problems such as the inability to accurately apply diffraction signals, and achieve good application value

Inactive Publication Date: 2015-06-24
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for using diffraction refocusing to identify small-scale geological bodies, so as to solve the problem that the diffraction signal cannot be accurately applied in the prior art

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  • Method and device for identifying small-scale geologic body through diffraction refocusing

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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] A method for identifying small-scale geological bodies using diffraction refocusing, such as figure 1 shown, including the following steps:

[0037] S1. Obtain a reflection interface dip angle field according to seismic imaging data; the seismic imaging data includes reflection information and diffraction information.

[0038] In step S1, in order to obtain the reflected wave dip angle field more accurately, a relational expression between the reflected wave dip angle and the seismic data is established through the local plane wave differential equation. By the regularized iterative approx...

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Abstract

The invention provides a method and device for identifying a small-scale geologic body through diffraction refocusing. The method includes the steps that a reflecting interface dip angle field is obtained according to earthquake imaging data; residual earthquake data without reflecting interface information are obtained through a linear filtering operator according to the reflecting interface dip angle field obtained through the earthquake imaging data; migration velocity analysis on over-excursion or under-excursion diffracted waves is carried out again through an isolated non-completely-focused diffracted wave field with the velocity analysis method; diffracted wave refocusing is completed through the excursion algorithm according to the residual earthquake data and the residual diffracted wave excursion speed. The device corresponds to the method. By means of the method and device, the small-scale geologic body with the bead-like karst, fissures, small-scale breakage and the like which are directly related to a carbonate reservoir can be effectively isolated, and the technical effect has the good application value on evaluating an oil and gas resource reservoir in the oil industrial circles.

Description

technical field [0001] The invention belongs to the field of seismic exploration, in particular to a method and device for identifying small-scale geological bodies by using diffraction refocusing. Background technique [0002] Small-scale geological bodies, such as faults, karst caves and fractures, are the main channels for oil and gas accumulation and percolation, and their prediction is crucial to the exploration and development of oil and gas fields. Since the spatial distribution of this type of geological body is smaller than or equal to a single Fresnel zone, it appears as a diffraction response (diffraction wave / scattering wave) in the seismic wave field. For seismic data processing, how to effectively separate and image the diffraction response from the collected seismic data has become the core of small-scale geological body detection technology. [0003] At present, there are many kinds of techniques and methods published at home and abroad to study diffraction ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 于彩霞王彦飞
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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