Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix
- PDF / 3,449,503 Bytes
- 16 Pages / 595.22 x 842 pts (A4) Page_size
- 8 Downloads / 231 Views
https://doi.org/10.1007/s11630-018-1053-9
Article ID: 1003-2169(2018)00-0000-00
Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix WAND Hui1,2, QU Zhiguo2*, YIN Ying2, BAI Junqiang1, YU Bo3 1. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China 2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China 3. Mechanical Engineering College, Beijing Institute of Petrochemical Technology, Bejing 102617, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018
Abstract: Shale gas is becoming an increasingly promising alternative energy resource because of its high efficiency and environment-friendly characteristic. The amount of adsorbed gas on the shale matrix surfaces and dissolved gas in the shale matrix bulk is the dominant factor in the long-term productivity of shale reservoir. Although experimental measurements have been extensively carried out to investigate the gas adsorption and diffusion properties in the shale matrix, they cannot provide the detailed information on the microscopic transport mechanism of shale gas during the gas production process. Molecular simulation can accurately visualize the gas adsorption/desorption and diffusion processes in the shale matrix. In the present study, the recent research advances of molecular simulation on gas adsorption/desorption and diffusion in the shale matrix are reviewed. Firstly, the density functional theory (DFT) for shale gas molecule desorption/adsorption on the surface of the matrix crystal is illustrated. Then, the grand canonical Monte Carlo (GCMC) method predicting the amount of shale gas desorption/adsorption in the shale matrix crystal is introduced. Finally, molecular dynamics simulation (MD) for gas diffusion in the shale matrix is elucidated. Further developments of the molecular simulation method in shale gas production are also discussed.
Keywords: shale gas, molecular simulation, adsorption/desorption, diffusion
1. Introduction With the rapid increment of global energy consumption, there is a gap between the supply of conventional natural gas resources and the increasing energy demand. Developing the unconventional gas becomes a promising way to solve the energy crisis [1]. As an important unconventional gas, shale gas owns a potential wealth of natural resources and the low carbon emission [2, 3]. The
Article type: Invited review
Received: June 27, 2018
worldwide reserve of shale gas can reach up to 7299 trillion cubic meters [4]. However, the shale stratum has complex petro-physical properties and exhibits low porosity and permeability due to the abundant macro-/ nano-scale pore throat structures [5]. Fig. 1 shows a typical scanning electron microscope (SEM) image of the shale matrix content. The shale matrix contains micro-, meso-, and macropores, and the pore distribution in the shale matrix is heterogen
Data Loading...
