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Method and device for determining influences of distributions of fractures and karst caves on reservoir permeability

A technology of permeability and karst caves, which is applied in the field of oil and gas field exploration and development, can solve the problems that the influence of karst caves cannot be considered, and the simulation research of the real distribution of fractures and karst caves cannot be considered, and the calculation amount can be simplified and quantified.

Inactive Publication Date: 2017-02-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] At present, in the numerical simulation of carbonate reservoirs, fractures and caves are usually regarded as a continuous medium, and the dual-media model or multi-media model is used for simulation, which is inconsistent with the real situation of discontinuity of fractures and caves; in addition Some scholars use the discrete fracture model for numerical simulation. In this simulation, only the influence of fractures is considered, and the dimensionality reduction and simplification of fractures are performed, and the influence of karst caves cannot be considered. In short, the current numerical simulation of carbonate reservoirs The real distribution of cracks and caves cannot be considered in simulation research

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  • Method and device for determining influences of distributions of fractures and karst caves on reservoir permeability

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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The terms "comprising" and "having" in the description and claims of the present invention and the above drawings, as well as any variations thereof, are intended to cover non-exclusive inclusion, for example, processes, methods, A system, product or device is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or device.

[0047] ...

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Abstract

The invention provides a method for determining influences of distributions of fractures and karst caves on carbonate reservoir permeability and relates to the technology of exploration and development of oil and gas fields. The method has the advantages that flowing simulation is carried out without simplifying the fractures and the karst caves according to real distribution parameters of the fractures and the karst caves of a carbonate reservoir stratum, and a unified model of a lattice Boltzmann method is adopted without considering boundary problems between matrixes and the fractures as well as the karst caves to enable all lattices to be processed in a unified manner, so that the calculated amount is greatly simplified and accurate results can be obtained; improved matrix permeability of the whole carbonate stratum with the fractures and the karst caves reckoned in through simulation according to different distributions of the fractures and the karst caves is obtained, and a specific value of the improved matrix permeability and intrinsic permeability is used for representing different distributions of the fractures and the karst caves on the improvement degree of the permeability of the carbonate reservoir stratum, so that quantitative calculation of the influences of the distributions of the fractures and the karst caves on the carbonate reservoir stratum is achieved.

Description

technical field [0001] The invention relates to oil and gas field exploration and development technology, in particular to a method and a device for determining the influence of the distribution of fractures and caves on the permeability of carbonate reservoirs. Background technique [0002] The seepage law of carbonate reservoirs is affected by its complex geological conditions, and its reservoirs contain a large number of fractures and caves. In order to study the flow law of carbonate reservoirs under complex geological conditions, it is necessary to study the influence of different fractures and caves on reservoir permeability, so as to facilitate the study of seepage laws of carbonate reservoirs. [0003] At present, in the numerical simulation of carbonate reservoirs, fractures and caves are usually regarded as a continuous medium, and the dual-media model or multi-media model is used for simulation, which is inconsistent with the real situation of discontinuity of fra...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张磊姚军刘鹏飞杨永飞万玉金苏云河李爱芬刘磊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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