标题：EXPERIMENTAL STUDY ON PORE CHARACTERISTICSAND METHANE ADSORPTION CHARACTERISTICS OFORGANIC-RICH SHALE OF QIONGZHUSI FORMATION INYUNNAN PROVINCE, CHINA
摘要：Shale gas refers to unconventional natural gas that exists in organic-rich mud shale and its interlayer, with adsorption or free state as the main existence mode. The thesis takes the organic-rich shale in Qiongzhusi, Yunnan Province as the research object. Scanning electron microscopy experiment, low temperature liquid nitrogen experiment and isothermal adsorption experiment were carried out to study the fracture characteristics and methane adsorption characteristics of shale reservoirs in Qiongzhusi Formation. The results show that the lithology of the Qiongzhusi Formation is mainly thin and medium- thick black carbonaceous shale and grayish black calcareous shale with limestone bands, which are weathered like bamboo leaves. The minimum thickness of the developed black shale is 15m. The maximum thickness is greater than 33m. At the same pressure, with the increase of TOC, the maximum methane adsorption capacity increases. The higher the TOC value in the shale of the Qiongzhusi Formation, the greater the maximum gas adsorption capacity of the shale. The pores of shale gas reservoirs are mainly nanopores, and there are certain pores with an amorphous structure. The internal pore structure of mineral particles has parallel plate-shaped slit- type pores, and other types of pores also exist. Research on the influencing factors of gas content of shale in Qiongzhusi Formation shows that there is a certain correlation between total gas content and component content and burial depth.
关键词：Shale gas;pores;methane adsorption;Qiongzhusi Formation;Yunnan Province
