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AVO (Amplitude Versus Offset) retrieval method, device and equipment for fractured medium

A medium and inversion technology, which is applied in the field of AVO inversion of fractured media, and can solve the problems of not giving the approximate formula of AVO, inaccuracy, and affecting the amplitude of seismic traces.

Active Publication Date: 2015-11-18
CHINA UNIV OF MINING & TECH (BEIJING) +1
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Problems solved by technology

In 2002, Chaisri discussed the extremely complicated solution of exact reflection and transmission coefficients under the condition of non-bonded interface, but did not give the approximate formula of AVO
[0005] When a seismic wave propagates underground and encounters a fractured medium (even if there is no impedance contrast around the fracture), the incident wave energy is partially reflected and recorded by surface seismic data. These seismic records, which contain characteristics of the fracture and surrounding rock medium, confirm that the fracture can produce reflections And seriously affect the amplitude, travel time and ratio of longitudinal and transverse waves (V p / V s ), according to which, if the studied reservoir is a fractured reservoir, the conventional AVO equation for inverting the properties of the surrounding rock medium from the seismic amplitude will be inaccurate, because the amplitude is inevitably affected by the fracture reflection
However, this issue is not addressed in conventional AVO methods

Method used

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  • AVO (Amplitude Versus Offset) retrieval method, device and equipment for fractured medium
  • AVO (Amplitude Versus Offset) retrieval method, device and equipment for fractured medium

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The original Zoeppritz equation describes the relationship between PP and PS wave incident angles and reflection and transmission coefficients based on bonded boundary conditions, and it is the basis of many approximate AVO inversion equations. In exploration, the AVO inversion method is widely used to estimate rock elastic reflection coefficients (P-wave, S-wave and density reflection coefficients), and then derive more parameters describing reservoir characteristics. These AVO equations are based on the assumption that bonded boundary conditions introduce inversion errors in fractured media with unbonded boundary conditions. This requires a method that is applicable to media with cohesive boundary conditions as well as media with uncohesive boundary conditions.

[0023] In the embodiment of the present inv...

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Abstract

The present invention discloses an AVO retrieval method for a fractured medium, comprising: obtaining seismic data of the fractured medium, inverting the seismic data through a newly established AVO equation, and obtaining a reflection coefficient of the fractured medium. The present invention further provides an AVO retrieval device and equipment for the fractured medium. According to the invention, the AVO retrieval method, the device and the equipment for the fractured medium are capable of accurately inverting lithological characters of the fractured medium (namely surrounding rock medium+fracture).

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to an AVO inversion method, device and equipment for fractured media. Background technique [0002] The purpose of AVO (AmplitudeVersusOffset, amplitude variation with offset) inversion is to estimate density, reflection coefficient of P-wave velocity and S-wave velocity by using existing surface seismic data whose amplitude varies with offset. Using AVO results to infer lithology and fluid properties, these reservoir parameters are the ultimate goals of oil and gas exploration. AVO inversion is based on the fact that the amplitude varies with the offset, so that the properties of subsurface rocks are directly related to surface seismicity, and can be used for reservoir description and oil and gas detection. Therefore, AVO inversion technology is an effective technology and is widely used in seismic exploration, petroleum seismic exploration, shale gas seismic explorati...

Claims

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/307G01V1/30G01V2210/632G01V2210/646
Inventor 崔晓芹
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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