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萍乐坳陷曲页1井乐平组页岩气和煤层气地质条件分析
陈哲,王中鹏,李尚儒
0
(1.长江大学地球科学学院,湖北武汉430100;2.江西省地质工程(集团)公司页岩气中心,江西南昌330000;3.赣中南地质矿产勘查研究院,江西南昌330000)
摘要:
为明确萍乐坳陷曲江向斜上二叠统乐平组页岩气和煤层气的地质条件和资源潜力,对研究区曲页1井的岩 心、录井、有机地化、岩石学和储集物性等资料进行分析,并采用现场解吸等手段对乐平组煤层气和页岩气进行综 合研究。结果表明:乐平组老山段暗色页岩累积厚度为183 m,煤层累积厚度为7 m,气测录井揭示乐平组含气层段 厚度可达356 m;优质页岩总有机碳含量平均为2.98%,镜质组反射率平均为1.88%,处于高-过成熟热演化阶段,以 生干气为主,现场解吸含气量最高可达2.1 m3/t。曲页1井乐平组煤层为煤质好的中阶煤,单层厚度大,含气量高。 萍乐坳陷乐平组页岩储层的含气量随埋深增加而增大,具有典型的浅层页岩气特点。
关键词:  页岩气  煤层气  储层  乐平组  萍乐坳陷
DOI:10.13673/j.cnki.cn37-1359/te.2019.04.007
基金项目:中国地质调查局项目“全国海陆成矿图件编制更新”(DD20160344)。
Geological condition analysis of shale gas and coalbed methane of Leping Formation in Well Quye1 of Pingle Depression
CHEN Zhe,WANG Zhongpeng,LI Shangru
(1.School of Geosciences,Yangtze University,Wuhan City,Hubei Province,430100,China;2.Jiangxi Geo-Engineering (Group)Corporation,Nanchang City,Jiangxi Province,330000,China;3.Ganzhongnan Institute of Geology and Mineral Exploration,Nanchang City,Jiangxi Province,330000,China)
Abstract:
To investigate the geological conditions and resources potential of shale gas and coalbed methane(CBM)of Upper Permian Leping Formation in Qujiang syncline in Pingle Depression,relevant data of Well Quye1 including drilling,logging,organic geochemistry,petrology,and reservoir characteristics were analyzed,and the CBM and shale gas of Leping Formation were studied by in-situ desorption. The results show that the accumulated thickness of shale and coal in Laoshan member of Leping Formation are 183 m and 7 m,respectively,and the gas logging reveals that the gas-bearing strata is 356 m,the average total organic carbon content of black shale in Leping Formation is 2.98%,and the average reflectance of vitrinite is 1.88%. The shale is in high-overmature thermal evolution stage in which dry gas generates dominantly and the measured desorbed gas content is 2.1 m3/t. The coal seam in Leping Formation of Well Quye1 is medium-rank coal with high quality,large thickness of single stratum and high gas content.It is found that the gas bearing capacity of shale reservoirs of Leping Formation in Pingle Depression increases with the buried depth,which shows the typical characteristics of shallow shale gas.
Key words:  shale gas  coalbed methane  reservoir  Leping Formation  Pingle Depression

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