A method, device, equipment and system for determining shale pore size distribution

Abstract

The embodiment of this specification discloses a method, device, equipment and system for determining shale pore size distribution. The method includes obtaining the nitrogen adsorption / desorption curve of the shale sample to be tested based on the isothermal adsorption experiment of liquid nitrogen; Pore ​​liquid nitrogen surface tension calculation model; according to the nanopore liquid nitrogen surface tension calculation model, the Kelvin equation is corrected to obtain the corresponding critical condensation aperture under different relative pressures; according to the corresponding critical condensation aperture under the different relative pressures and the obtained The nitrogen adsorption / desorption curve is determined to determine the pore size distribution information of the shale sample to be tested. By using the embodiments of this specification, more accurate shale pore size distribution can be obtained, which is beneficial to scientifically and rationally evaluating the pore distribution characteristics of actual shale.

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...

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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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