地质通报2016，Vol.35Issue(2)：231-241,11.
柴达木盆地鱼卡地区中侏罗统页岩气成藏条件
An analysis of reservoir-forming conditions of shale gas in Middle ;Jurassic strata of Yuqia area, Qaidam Basin
摘要
Abstract
According to geological drilling, field desorption, and experimental sample analysis, the authors studied the reservoir-form⁃ing conditions of shale gas in Middle Jurassic strata of Yuqia area. The results show that the shale in Middle Jurassic strata of Yuqia ar⁃ea is a set of high-quality hydrocarbon source rocks comprising mainly braided river delta, braided river plain and lake facies. It is mainly developed in Dameigou (J2d5) and Shimengou formations. The cumulative thickness is 38~300m, TOC is 0.12%~13.23%, Ro is 0.29%~0.89%, quartz content is 18.0%~63.3%, clay mineral content is 10.1%~55.6%, porosity is 1.53%~14.92% and permeability is 0.007×10-3~6.24×10-3μm2. Scanning electron microscope analysis has revealed micro pores consisting mainly of intergranular pore, dissolved pore, grain pore, with pore diameter being more than 0.3~3μm. Shale gas content is 0.42~0.83m3/t, desorption gas CH4 content is 8.6%~64.9%, andδ13C1 is-80.59‰~-63.32‰. A comparison with domestic and foreign gas shales shows that the Middle Jurassic shale in the study area is characterized by large thickness, high TOC and medium quartz content;nevertheless, there also ex⁃ists some disadvantages in the study area such as small distribution area, low maturity and low gas content in addition, the study area has experienced repeated tectonic movement since Cenozoic, which exerted a considerable impact on shale gas. For the exploration prospect of Middle Jurassic shale gas in Yuqia area, much attention should be paid to the study of tectonic preservation of shale gas and shale gas genetic types as well as resource assessment.关键词
页岩气/成藏条件/泥页岩/中侏罗统/鱼卡Key words
shale gas/reservoir-forming conditions/shale/Middle Jurassic/Yuqia area分类
天文与地球科学引用本文复制引用
王晓鹏,李玉宏,张云鹏,李智明,郭望,宋博..柴达木盆地鱼卡地区中侏罗统页岩气成藏条件[J].地质通报,2016,35(2):231-241,11.基金项目
中国地质调查局项目 （）
