Abstract
Pore characteristics are one of the most important elements in the study of shale reservoir properties and are a key parameter for the evaluation of the potential of shale oil and gas resources. Low-temperature nitrogen adsorption is a common laboratory method that is used to characterize the pore structure of shale. However, the effect of shale’s particle size on the experimental results of the nitrogen adsorption of deep shale samples is still unclear. In this paper, using deep shale samples of different mesh sizes from the Luzhou Block as an example, we studied the effect of particle size on the pore structure of deep shale, as characterized by nitrogen adsorption experiments. The results showed that the pore volume of deep shale is mainly distributed in the mesoporous range, with a pore size ranging from 2 to 20 nm. The pore volume, as measured by nitrogen adsorption, increases slowly as the particle size decreases and then it increases rapidly. The particle size of shale has no obvious effect on the measurement of the specific surface area. The fractal dimension of deep shale gradually increases as the particle size of the shale samples increases and the smaller the particle size, the higher the correlation coefficient, R2, of the fractal dimension fitting. In this paper, different recommended sizes are given for selecting suitable particle sizes in nitrogen adsorption experiments on deep shale with different structural parameters, which will increase the accuracy of the study of the pore structure of deep shale.
Highlights
The “shale revolution” in the United States has triggered interest in shale gas exploration and development around the world [1]
The desorption line is located above the adsorption line, forming an obvious hysteresis loop
All of the curves are similar to the IV isothermal adsorption curve that is recommended by the International Union of Pure and Applied Chemistry (IUPAC) [35], with the hysteresis loop appearing between H3 and H4
Summary
The “shale revolution” in the United States has triggered interest in shale gas exploration and development around the world [1]. China began shale gas exploration and development in 2012 and is currently developing shale gas on a large commercial scale in the Sichuan Basin. China has produced 20.04 billion m3 of shale gas, ranking second worldwide in 2020 [2]. As the development area expands, deeper shales with depths of more than 4000 m are being developed [3–5]. Deep shale gas with a burial depth of more than 3500 m accounts for 90% of the overall resources
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