石油实验地质2019，Vol.41Issue(1)：83-93,11.DOI:10.11781/sysydz201901083
江西萍乐坳陷中部赣丰地1井上二叠统乐平组页岩气聚气条件
Shale gas accumulation in the Upper Permian Leping Formation: a case study of well Ganfengdi-1 in the central Pingle Depression, Jiangxi Province
摘要
Abstract
The Upper Permian Leping coal measures are widely developed in the Pingle Depression, Jiangxi Pro-vince, which is a key area for shale gas exploration in the Lower Yangtze region. The core data of well Ganfengdi-1, the first geological survey well in the Pingle Depression, which drilled through the main shale of Leping Formation, were studied in order to determine the shale gas accumulation conditions and exploration potential in the central Pingle Depression. More than 200 core samples were analyzed using non-uniform sampling. By means of thin section observations, organic geochemical analysis, X-ray diffraction analysis of whole rock and clay minerals, argon ion polishing scanning electron microscopy and in situ analysis of shale, it was determined that a large thickness of the black carbonaceous shale of the Leping Formation in the central Pingle Depression has a high content of organic carbon. The type of organic matter is good, and the stage of high maturity gas generation is favorable for shale gas generation and accumulation. In addition, the content of brittle minerals is high. The brittle index I is 26％-53.5％, averaging 37.3％, while the brittle index Ⅱ is 23.3％-52.6％, averaging 39.0％, which indicates that the shale formation has a good compressibility. Organic pores and intragranular pores in clay minerals are well-developed. The internal connectivity of the pores is good, and the specific surface area of the minerals is high, which is of great significance for the occurrence of shale gas. The micro-cracks mainly play a role of communication and diversion to improve the关键词
页岩/页岩气/重点层段/乐平组/上二叠统/萍乐坳陷/江西Key words
shale/shale gas/key stratum/Leping Formation/Upper Permian/Pingle Depression/Jiangxi Province分类
能源科技引用本文复制引用
方朝刚,徐振宇,滕龙,黄正清,郑红军,徐菲菲..江西萍乐坳陷中部赣丰地1井上二叠统乐平组页岩气聚气条件[J].石油实验地质,2019,41(1):83-93,11.基金项目
国家科技重大专项"下扬子地区寒武系页岩地球化学特征与含气性研究"(2016ZX05034-001-003) （2016ZX05034-001-003）
中国地质调查局调查二级项目"下扬子地区古生界页岩气基础地质调查"(DD2016-0180)联合资助 （DD2016-0180）
