济宁凹陷石炭二叠系非常规油气潜力  

Unconventional Oil and Gas Potential of Carboniferous and Permian in Jining Sag

作　　者：李翠芳 LI Cui-fang(Shandong Provincial Research Institute of Coal Geology Planning and Exploration,Jinan 250104,China)

机构地区：[1]山东省煤田地质规划勘察研究院,济南250104

出　　处：《煤炭技术》2020年第8期63-66,共4页Coal Technology

基　　金：山东省地质勘查专项基金项目(鲁勘字(2013)5号)。

摘　　要：通过济宁凹陷石炭—二叠系泥页岩厚度、地球化学、岩石矿物学、储层孔渗和含气性等特征分析发现,山西组、太原组作为复合评价层,为研究区主要页岩气储层。泥页岩厚度呈现"南薄北厚"趋势,最厚处大于310 m,有机质类型以Ⅲ型为主,有机碳含量0.23%~28.84%,生烃潜量0.01~34.23 mg/g,有机质丰度中等-好,有机质成熟度0.67%~3.51%,处于低成熟-成熟阶段,具较好的生气潜力;泥页岩矿物成分以黏土矿物、石英和长石为主,平均含量分别为42.0%,44.25%和9.95%,脆性指数Ⅱ为55.82,具有良好的脆性;属低孔-低渗储层,发现气测异常26层,异常段累厚32.39 m,最大全烃值3.597 9%,解吸气0.01~5.17 m3/t,总含气量0.03~9.15 m3/t,气含量高值位于在煤层附近,气成分主要为CH4,含量为0~81.93%,含气性较好;发育3层有利含气层段,可作为今后开展非常规油气勘查突破的重点目标。Based on the analysis of the Carboniferous-Permian shale thickness, geochemistry,petromineralogy, reservoir porosity and permeability and gas-bearing characteristics in Jining sag.Shanxi formation and Taiyuan formation, as composite evaluation layers, were the main shale gas reservoirs in the study area. The thickness of shale showed a trend of thin in the south and thick in the north". The thickest part was more than 310 m. The type of organic matter was mainly type III. The organic carbon content was 0.23% to 28.84%, the hydrocarbon generation potential was 0.01 mg/g to34.23 mg/g, the organic matter abundance was medium-good, the organic matter maturity was 0.67% to3.51%, and it was in the stage of low maturity-maturity and had good gas generation potential. Clay minerals, quartz and feldspar were the main components of shale minerals, with average contents of42.0%, 44.25% and 9.95% respectively and brittleness index II of 55.82, which showed good brittleness. It belonged to a low porosity and low permeability reservoir. It was found that there were 26 layers with abnormal gas measurement. The accumulated thickness of the abnormal section was 32.39 m,the maximum total hydrocarbon value was 3.597 9%, desorption gas was 0.01 m3/t to 5.17 m3/t, and the total gas content was 0.03 m3/t to 9.15 m3/t. The high gas content was located near the coal seam. The gas composition was mainly CH4, with a content of 0 to 81.93%, and the gas content was good. The development of 3 favorable gas-bearing intervals could be regarded as the key target for future unconventional oil and gas exploration breakthroughs.

关 键 词：济宁凹陷 石炭-二叠系 非常规油气 

分 类 号：P618.13[天文地球—矿床学]