Method for inversion of properties of fracture

A technology of inversion and properties, applied in the field of inversion of fracture properties, which can solve problems such as large dependence on prior information, inconsistency, and errors.
CN107797141AInactive Publication Date: 2018-03-13CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2018-03-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention proposes a method for inversion of properties of a fracture. The method comprises: establishing an inversion objective function based on frequency-variant amplitude versus offset and azimuth (AVAZ) features; according to a calculation result of the inversion objective function, establishing a likelihood function of a fracture parameter; combining prior distribution of the fracture parameter with the likelihood function of the fracture parameter and calculating a posterior probability distribution function of the fracture parameter; and with a statistic method, displaying an inversion result visually. Compared with the existing method, the novel method has the following beneficial effects: the result of the novel method is close to the real situation in terms of medium hypothesis presupposition; more fracture properties are predicted in terms of results and fluid identification can be performed; and the effective and reasonable fusion process of balancing geology, logging,and seismic information is realized.
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Description

technical field

[0001] The invention relates to the technical field of oil and gas geophysics, in particular to a method for retrieving fracture properties. Background technique

[0002] With the development and utilization of oil and natural gas resources, the reserves of conventional porous oil and gas reservoirs are decreasing day by day, and the difficulty of development is gradually increasing. The direction of oil and gas exploration is gradually shifting from shallow to deep, and from conventional oil and gas reservoirs to special oil and gas reservoirs, especially fractured reservoirs. (tight sandstone, carbonate rock and shale reservoir, etc.). The study of fracture prediction is of great significance.

[0003] Almost all oil and gas reservoirs are affected to some degree by natural fractures. Fractures developed underground are often important places for oil and gas storage, and as a common phenomenon, fractures widely exist in various rock formations. In carbon...

Claims

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