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Tight sandstone effective reservoir identifying method

A technique for tight sandstone reservoirs and tight sandstone, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of low recognition accuracy and achieve the effect of contiguous prediction and economical and effective development

Active Publication Date: 2015-10-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a tight sandstone effective reservoir identification method to solve the problem of low identification accuracy caused by conventional oil reservoir identification methods in the existing tight sandstone effective reservoir identification process

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Embodiment Construction

[0033] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] Effective tight sandstone reservoirs are generally reservoirs with relatively high-quality physical properties under the background of low porosity and low permeability. Due to the tightness and low permeability of reservoirs, complex and diverse pore structures, and strong heterogeneity, electrical properties are affected by physical properties and rock properties. The framework has great influence, the logging response characteristics are complicated, and it is difficult to identify effective reservoirs by conventional logging. production capacity. On the one hand, this phenomenon indicates that tight sandstone reservoirs contain huge potential for development; Under the development requirements. For this reason, the present invention provides a method for identifying effective tight sandstone reservoirs. First, the basic geologic...

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Abstract

The present invention relates to a tight sandstone effective reservoir identifying method. The method comprises: first describing tight sandstone reservoir basic geological features one by one according to geological factors that affect tight sandstone reservoir forming; then determining a main controlling factor of petroleum accumulation according to static and dynamic data of a producing well, determining a reservoir-forming pattern of the tight sandstone according to the obtained main controlling factor, and delineating a favorable distribution range of an effective reservoir under constraint of the reservoir-forming pattern; determining lower limiting values of oiliness, physical property and electrical property of a reservoir stratum in the delineated favorable distribution range of the effective reservoir by using a statistical method; and finally superimposing, on a plane, a plane distribution image of the foregoing determined parameters, and delineating an effective reservoir range, to identify a tight sandstone effective reservoir. According to the present invention, a tight sandstone oil-gas layer is identified and is finely depicted under constraint of the reservoir-forming pattern, so that a conventional deficiency that a central oil layer is not continuous because of single-well logging interpretation is overcome, thereby implementing continuous prediction of a tight sandstone oil sand body.

Description

technical field [0001] The invention relates to a method for identifying effective tight sandstone reservoirs, belonging to the technical field of oil and gas identification in unconventional reservoirs. Background technique [0002] As an important type of continuous unconventional oil and gas reservoirs, tight sandstone reservoirs are widely distributed in various basins in China. Due to the tightness and low permeability of reservoirs, the development effect of vertical well conventional fracturing is poor. With the emergence of large-scale fracturing technologies such as vertical well layered fracturing and horizontal well segmentation, it has become possible to effectively develop and produce such oil and gas reservoirs as a whole. In tight sandstone oil and gas reservoirs distributed over a large area, relatively high-quality effective reservoirs are usually locally developed. How to identify such reservoirs is the prerequisite for economically and effectively producin...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 刘峥君黎明黎锡瑜杨晓培朱景修周永强黄磊韩丰华苏剑红梁丽梅
Owner CHINA PETROLEUM & CHEM CORP
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