Characteristics of Microscopic Pores of Shale from Upper Sinian Doushantuo Formation in the Western of Hunan and Hubei, China and the Main Controlling Factors(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2017年第01期
- Page:
- 114-125
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Characteristics of Microscopic Pores of Shale from Upper Sinian Doushantuo Formation in the Western of Hunan and Hubei, China and the Main Controlling Factors
- Author(s):
- SUN Yin-sen; GUO Shao-bin
- 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China; 2. Key Laboratory of Shale Gas Exploration and Evaluation of Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China; 3. CNPC Greatwall Drilling Company, Beijing 100083, China
- Keywords:
- shale; pore characteristic; controlling factor; nitrogen adsorption/desorption; nuclear magnetic resonance; Upper Sinian; Doushantuo Formation
- PACS:
- P618.13;TE122
- DOI:
- -
- Abstract:
- With the deeply research on shale gas in China, the study on the characteristics of microscopic pores of shale reservoir is focused on. In order to further understand the characteristics of shale pores from Upper Sinian Doushantuo Formation in the western of Hunan and Hubei, China, the scanning electron microscope (SEM), argon ion polishing-field emission scanning electron microscope (FESEM), nitrogen adsorption/desorption and nuclear magnetic resonance (NMR) tests were used to make qualitative observation and quantitative characterization of shale porosity under different scales; combined with the whole rock quantitative analysis data of organic geochemistry and rock minerals, the main controlling factors on shale porosity were discussed. The results show that there are 6 types of pores from Doushantuo Formation in the western of Hunan and Hubei, including intergranular, intragranular, pyrite intercrystalline, interlayer, organic pores and micro cracks; the pore diameters of shales are 2-5 nm, and the middle pore mainly develops, a small amount of micro and macro pores develop; the pores with the peak diameters of 2-5 nm are the main contributor to shale pore volume; the types of shale pore structure are mainly narrow plate pore, and partly cylinder pore, conical pore, etc.; total organic carbon is the main contributor to the development of micro and middle pores, and the content of clay mineral mainly affects the development of middle pore, and the content of brittleness mineral mainly controls the development of macro pore.
Last Update: 2017-01-20