期刊
MINERALS
卷 9, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/min9060356
关键词
Longmaxi Formation shale; pore structure; N-2 adsorption; helium ion microscope; fractal dimension
资金
- National Natural Science Foundation of China [41530315, 41372213, 41872160]
- National Science and Technology Major Project of China [2016ZX05066]
- Climate Change: Carbon Budget and Related Issues Strategic Priority Research Program of the Chinese Academy of Sciences [XDA05030100]
- Sichuan Science and Technology Support Program [2016JZ0037]
This paper tries to determine the key evaluation parameters of shale reservoirs in the complex tectonic provinces outside the Sichuan Basin in South China, and also to target the sweet spots of shale reservoirs accurately. The pore-structure characteristics of the Lower Silurian Longmaxi shale gas reservoirs in Well LD1 of the Laifeng-Xianfeng Block, Upper Yangtze region, were evaluated. N-2 adsorption and helium ion microscope (HIM) were used to investigate the pore features including pore volume, pore surface area, and pore size distribution. The calculated results show good hydrocarbon storage capacity and development potential of the shale samples. Meanwhile, the reservoir space and migration pathways may be affected by the small pore size. As the main carrier of pores in shale, organic matter contributes significantly to the pore volume and surface area. Samples with higher total organic carbon (TOC) content generally have higher porosity. Based on the Frenkel-Halsey-Hill equation (FHH model), two different fractal dimensions, D-1 and D-2, were observed through the N-2 adsorption experiment. By analyzing the data, we found that large pores usually have large values of fractal dimension, owing to their complex pore structure and rough surface. In addition, there exists a good positive correlation between fractal dimension and pore volume as well as pore surface area. The fractal dimension can be taken as a visual indicator that represents the degree of development of the pore structure in shale.
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