Method, device, equipment and system for determining pore size distribution of shale

Abstract

The embodiment of the invention discloses a method, device, equipment and system for determining shale pore size distribution. The method comprises the following steps: acquiring a nitrogen adsorption/desorption curve of a shale sample to be detected based on a liquid nitrogen isothermal adsorption experiment; establishing a nanopore liquid nitrogen surface tension calculation model based on critical temperature change information of fluid in the nanopores and the influence information of the curvature of the meniscus on the surface tension of the nanopores; correcting a Kelvin equation according to the nanopore liquid nitrogen surface tension calculation model to obtain corresponding critical condensation pore diameters under different relative pressures; and determining pore size distribution information of the shale sample to be detected according to the corresponding critical condensation pore sizes under different relative pressures and the nitrogen adsorption/desorption curve. According to the embodiment of the invention, more accurate shale pore size distribution can be obtained, so that the pore size distribution characteristics of actual shale are scientifically and reasonably evaluated.

Description

technical field [0001] The embodiments of this specification belong to the field of unconventional oil and gas exploration and development, and in particular relate to a method, device, equipment and system for determining shale pore size distribution. Background technique [0002] The exploration and development of unconventional oil and gas resources are of great significance to meet my country's growing energy demand. In unconventional oil and gas reservoirs, shale oil and gas shows great potential for development, and it is a hot and difficult point of current research. The evaluation of shale pore distribution characteristics is an important link in the process of shale oil and gas development. Accurate pore information has important guiding significance for analyzing the gas-bearing capacity and gas production capacity of shale. [0003] In the development of nanopores in shale, traditional high-pressure mercury intrusion experiments are usually difficult to accuratel...

AI Technical Summary

Problems solved by technology

However, in the existing method of obtaining shale pore distribution by liquid nitrogen adsorption, the surface tension is regarded as a constant value, which usually produces deviations, and the calculation results cannot accurately and reasonably reflect the real pore distribution of shale, which greatly affects the shale Evaluation of reservoir gas bearing capacity and gas production capacity

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