Shale gas adsorption characteristics and influencing factors of Taiyuan Formation in Eastern Ordos Basin
XIONG Quan1, PENG Yuan2, TANG Youjun1, CHEN Tianyu2, MAO Yahui2
1. Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan 430100, China; 2. Key Laboratory of Salt Lake Resources and Environment, Ministry of Natural Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract：Taiyuan Formation in Eastern Ordos Basin develops a set of potential hydrocarbon source rocks in Suide area of the study area. Its total organic carbon content is between 0.75% and 5.71%, with an average content of 2.75%, and its organic maturity (Ro) is mainly between 1.43% and 2.12%, with an average of 1.80%. It is in the stage of high maturity to over maturity and has a good gas potential. In order to study the adsorption characteristics of shale from Taiyuan Formation in Eastern Ordos Basin, 10 shale samples from well SSD1 in the study area were selected for isothermal adsorption, total organic carbon content, vitrinite reflectance, X-ray diffraction and specific surface area test. On this basis, the adsorption capacity and the influencing factors of organic-rich shale from Taiyuan Formation in Eastern Ordos Basin were discussed. The results show that the Langmuir volume of 10 shale samples from Taiyuan Formation of well SSD1 in the study area is 1.11-2.41 m3/t. With the increase of pressure, the adsorption capacity increases rapidly and reaches saturation at a certain pressure. The adsorption capacity of shale is positively correlated with the total organic carbon content and clay mineral content, while the specific surface area of shale is not significantly correlated with Langmuir volume. It is possible that the pore size and morphology of the sample have some influence on gas diffusion and adsorption. The comprehensive evaluation shows that the total organic carbon content and clay mineral content are important factors affecting the adsorption capacity of shale in Taiyuan Formation, which can provide some reference for shale gas exploration in the eastern part of the basin.
2019, Vol. 6 
