Method for establishing earthquake response mode based on fracture equivalent medium model

An equivalent medium model and seismic response technology, applied in the field of exploration geophysics, can solve the problem of inability to detect and identify underground fractured reservoirs

Active Publication Date: 2011-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the above-mentioned equivalent medium theories are only limited to theoretical research, and there is no method of using seismic wave field numerical simulation to establish the seismic response model of the actual formation fracture equivalent medium model based on the fracture equivalent medium theory. The detection provides identification basis

Method used

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  • Method for establishing earthquake response mode based on fracture equivalent medium model
  • Method for establishing earthquake response mode based on fracture equivalent medium model
  • Method for establishing earthquake response mode based on fracture equivalent medium model

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Embodiment 1

[0039] Embodiment 1: The technical solution adopted by the present invention to achieve its purpose is to use the fracture equivalent medium theory to quantitatively express the relationship between the fracture characteristic parameters and the equivalent medium elastic parameters, and to establish the anisotropy of the fracture network based on the Bond transformation and superposition principles, etc. The constitutive relationship of the effective medium model is established, and the constructed equivalent medium model of the fracture network is placed in the actual spatial position of the formation to establish the equivalent medium model of the actual formation fracture; Seismic response models of fractured reservoirs. The specific process is as follows:

[0040] (1) Carry out field outcrop and core observations, summarize the fracture development law, fully understand the fracture formation mechanism and development law, and extract fracture characteristic parameters.

...

Embodiment 2

[0065] Embodiment 2: Taking Futai Buried Hill Fractured Oil Reservoir in Shengli Oilfield as an example and in conjunction with the accompanying drawings, the content and realization principle of the present invention are described in detail:

[0066] 1. Quantitative description of fracture characteristic parameters

[0067] Through field outcrop observation and laboratory core observation, the fracture development status of the Futai buried hill fractured reservoir in Shengli oil region can be obtained, and the spatial distribution information of fractures can be extracted from it: fracture dip (dip angle), strike (azimuth angle) , the number of fracture development groups and their distribution (plane conjugation, profile conjugation); at the same time obtain the characteristic parameters describing fractures: fracture density, opening, extension length, filling material, fracture layer thickness and fracture background rock sex.

[0068] 2. Establishment of equivalent medi...

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Abstract

The invention discloses a method for establishing an earthquake response mode based on a fracture equivalent medium model, which belongs to the field of exploration geophysics. The method is characterized by comprising the following steps of: determining a relationship between fracture characteristic parameters and equivalent medium elastic parameters by quantificationally applying a fracture equivalent medium theory, establishing a constitution relation of a fracture network anisotropic equivalent medium model based on a Bond conversion and superposition principle, and placing the constructed fracture network equivalent medium model in an actual space position of strata, and establishing an actual stratigraphic fracture equivalent medium model; and establishing an earthquake response model of different tectonic positions and different lithologic fractured reservoirs by use of an earthquake wave field numerical simulation method. The method for establishing the fractured reservoir earthquake response mode based on the fracture equivalent medium model has strong practicability, and provides the basis for identifying the fractured reservoir from the prestack earthquake data.

Description

1. Technical field: [0001] The invention relates to the field of exploration geophysics, in particular to a method for establishing a seismic response model based on a fracture equivalent medium model. 2. Background technology: [0002] In the process of oil and gas exploration and development, it is often necessary to use seismic wave field numerical simulation to study the propagation law of seismic waves in specific complex earth media. That is to say, people can simulate the propagation of the seismic wave field through the forward modeling method, summarize the characteristics of the seismic wave field corresponding to different media to obtain a regular understanding, and use the general laws obtained to infer the specific earth medium type from the field actual records . Fractured oil and gas reservoirs are an important new field for increasing oil reserves and production in recent years. Fractured reservoirs greatly affect the propagation of seismic waves in the ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40
Inventor 杜启振王雪梅张强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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