Quantitative evaluation method for microfractures of tight clastic rock reservoir

Abstract

The invention discloses an oil-gas exploration, development and analysis technology. A quantitative evaluation method for the microfractures of the tight clastic rock reservoir comprises the followingsteps that the microfractures are recognized, and true and effective microfractures are determined; the opening degree, the length and the density parameter of the microfractures are measured; the porosity and permeability of the underground microfractures are calculated through conversion of measurement parameters; and comprehensive quantitative evaluation is carried out on the microfractures byintegrating multiple parameter characteristics of microfracture development. According to the method, the microscopic fractures in the clastic rock reservoir can be accurately and quantitatively evaluated; therefore, the reservoir characteristics are described finely, the reservoir is evaluated accurately, the development efficiency of the compact clastic rock reservoir is improved, the development level of the microfractures of the compact clastic rock reservoir can be determined, quantitative evaluation of the microfractures of the compact clastic rock reservoir is effectively guided, and afoundation is laid for efficient development of the oil and gas reservoir.

Description

technical field [0001] The invention relates to an analysis technology for oil and gas exploration and development, in particular to a quantitative evaluation method for micro-fractures in tight clastic rock reservoirs. Background technique [0002] In the process of oil and gas exploration and development, it means that in order to identify exploration areas and prove oil and gas reserves, geological survey, geophysical exploration, drilling and related activities are required. Among them, the analysis of fractures in clastic rock reservoirs is particularly important. Fractures can be divided into two types: macroscopic fractures and microscopic fractures. Microscopic fractures in clastic rock reservoirs refer to fractures with an opening degree less than 20 μm. It is found in actual research that the development of microscopic fractures determines the productivity of tight sandstone reservoirs, but At present, the research on microscopic cracks at home and abroad is just i...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome that the current research on microscopic cracks is still in its infancy, and the morphology and distribution characteristics of microscopic cracks have been explained accordingly, but the quantitative evaluation of microscopic cracks has not been done, and the compactness cannot be judged from the development status of microscopic cracks. In order to solve the problem of storage and seepage performance of reservoirs, a quantitative evaluation method for micro-fractures in tight clastic rock reservoirs is provided. Evaluate the reservoirs, improve the development efficiency of tight clastic rock reservoirs, determine the development level of micro-fractures in tight clastic rock reservoirs, effectively guide the quantitative evaluation of micro-fractures in tight clastic rock reservoirs, and provide oil and gas reservoirs Lay the foundation for layer-by-layer efficient development

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