Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones: a digital core approach

• 作者: Jing Li Xiao-Rong Li Ming-Shui Song Hui-Min Liu Yong-Cun Feng Chen Liu
• 来源期刊: 石油科学（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: PETROLEUM ENGINEERING & MECHANICS
• 页码范围: 173-182
• 页数: 10页
• 语种: 英文

摘要

Microscopic seepage characteristics are critical for the evaluation of tight sandstone reservoirs.In this study,a digital core approach integrating microscopic seepage simulation and CT scanning was developed to characterize microscopic seepage and fracture effectiveness (the ratio of micro-fractures that contributes to fluid flow) of tight sandstones.Numerical simulations were carried out for characterizations of tight sandstones.The results show that the axial permeability of the investigated cylindrical tight sandstone from Junggar Basin in China is 0.460 μm2,while the radial permeability is 0.3723 μm2,and the axial and radial effective fracture ratios are 0.4387 and 0.4806,respectively,indicating that cracks are not fully developed and the connectivity between micro-cracks is poor.Directional permeability that is difficult to measure by laboratory experiments can be obtained readily using the proposed method in this paper.The results provide important information for improving the exploration and development of tight sandstone reservoirs.