Micro Pore Characteristics and Their Controlling Factors of Permian Shale Reservoir in Southern Anhui(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第05期
- Page:
- 668-684
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Micro Pore Characteristics and Their Controlling Factors of Permian Shale Reservoir in Southern Anhui
- Author(s):
- CAO Tao-tao; SONG Zhi-guang; WANG Si-bo; XIA Jia; CAO Qing-gu
- 1. Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Development, SINOPEC, Wuxi 214126, Jiangsu, China; 2. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China; 3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
- Keywords:
- pore type; shale; specific surface area; porosity; maceral composition; total organic carbon; Permian; Anhui
- PACS:
- P618.13；TE122.2
- DOI:
- -
- Abstract:
- Permian develops a certain scale of organic-rich shales in the southern Anhui. In order to study the pore structure characteristics of the shale reservoir, the core samples from two wells were collected to carry out low-pressure nitrogen adsorption, mercury intrusion, argon ion polishing and field emission scanning electron microscopy tests, and the controlling factors were also discussed combining with the geochemistry, organic petrology and mineral composition. The results show that shale reservoirs in Longtan and Gufeng Formations have great thickness, high total organic content (TOC) and moderate thermal maturity; the minerals are mainly consisted of quartz, illite, feldspar and pyrite; the organic matter of Longtan Formation is dominated by vitrinite and solid bitumen, and the kerogen is type Ⅲ which behaves as lamellar structure, stripped or block-shaped, and the dominated pore types are intergranular pores and fractures, but the organic pores are not developed; the specific surface area and porosity of shales in Longtan Formation are in the range of 6.80-41.62 m2.g-1 and 0.68%-4.44%, respectively, which are mainly contributed by mesopores; shales in Gufeng Formation have type Ⅱ kerogen which is composed of sapropel and solid bitumen with thin layer or interstitial shapes; shales in Gufeng Formation develop abundant organic pores and a certain number of intergranular pores and fractures, and have the specific surface area of 3.12-49.45 m2.g-1 which is mainly contributed by micropores, and the porosity of 0.86%21.08% which is mainly contributed by mesopores and macropores; TOC is the controlling factor of the specific surface area of these Permian shales, but has a significant inhibitory effect on porosity; content of illite has an obvious negative relationship with the specific surface area, but has no relationship with porosity for these Permian shales.
Last Update: 2016-09-30