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.

Inactive Publication Date: 2018-03-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Neither of the above two inversion methods can be used for fluid identification, and the former relies heavily on the prior information obtained from geology and well logging, while the latter does not consider how to reasonably integrate the fracture prediction results of geology and well logging
[0007] However, in fact, the complexity of fractures requires a reaso...

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  • Method for inversion of properties of fracture
  • Method for inversion of properties of fracture
  • Method for inversion of properties of fracture

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Embodiment Construction

[0029] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0030] Quantitative characterization of fracture properties based on AVAZ responses including seismic dynamics features is a hot topic in fractured reservoir research. According to the surveyed data, the prediction of fracture properties is limited by the static rock physics model, and generally only the fracture density and fracture trend can be predicted. Nature offers possibilities. At present, there is almost no research on fracture pr...

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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.

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...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/306G01V2210/6161G01V2210/6169G01V2210/62G01V2210/6224
Inventor 刘宇巍刘喜武霍志周刘志远张远银张金强
Owner CHINA PETROLEUM & CHEM CORP
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