赣东北重点泥页岩层系地球化学特征分析

发布时间：2018-04-01 00:37

本文选题：泥页岩　切入点：页岩气　出处：《特种油气藏》2017年01期

【摘要】：为研究赣东北重点泥页岩层系沉积环境及生烃条件,采用X射线衍射(XRD)分析、电感耦合等离子体质谱(ICP)分析、有机碳含量分析、镜质组反射率测定、干酪根镜检、岩石热解测试等方法,对赣东北重点泥页岩层系样品矿物含量,有机质丰度、成熟度、类型,微量元素及稀土元素含量等地化特征进行了研究。研究表明:赣东北皮园村组、荷塘组、乐平组页岩矿物成分以石英等脆性矿物为主,钒含量与镍钒总含量比值的均值分别为0.79、0.81、0.72,铈、铕含量均表现负异常,轻重稀土含量比均值分别为5.31、4.34、8.20,La和Yb球粒陨石标准化值的比值均值大于1。研究区泥页岩层系沉积环境均为相对低温、弱酸性、含硫化氢的厌氧—贫氧还原环境,有机质丰度较高,属腐泥型或腐植—腐泥型有机质,具有较好的生烃条件;但由于处于过成熟阶段,原始生烃母质生烃能力已消耗殆尽,储层已经历大规模生排烃过程。因此,研究区页岩气勘探应加强"五史"(地、热、生烃、排烃及运移聚集史)及"运、储、保"等条件的研究。赣东北重点泥页岩层系地球化学特征及生烃潜力的研究可为下扬子海相页岩气勘探的突破提供理论与实践依据。
[Abstract]:In order to study the sedimentary environment and hydrocarbon generation conditions of key shale series in northeast Jiangxi Province, X-ray diffraction (XRD) analysis, inductively coupled plasma mass spectrometry (ICP) analysis, organic carbon content analysis, vitrinite reflectance measurement, kerogen microscopy were used. The geochemical characteristics of mineral content, organic matter abundance, maturity, type, trace element and rare earth element content in the samples of key shale series in northeast Jiangxi Province were studied by means of rock pyrolysis test. In Hetang formation, the mineral composition of shale in Leping formation is mainly composed of quartz and other brittle minerals. The mean values of vanadium content and total nickel vanadium content ratio are 0.79 ~ 0.81 ~ 0.72, respectively, and the contents of cerium and europium are all negative abnormal. The mean values of the normalized values of chondrites of La and Yb are 5.31, 4.34 and 8.20, respectively. The sedimentary environments of shale strata in the studied area are relatively low temperature, weak acidity, anaerobic-oxygen-deficient reduction environment containing hydrogen sulfide, and high abundance of organic matter. It is a saprophytic or saprophyt-saproot type organic matter with good hydrocarbon generation conditions, but the hydrocarbon generation capacity of the original hydrocarbon source material has been exhausted in the over-mature stage, and the reservoir has experienced a large-scale hydrocarbon generation and expulsion process. Shale gas exploration in the study area should strengthen "five history" (land, heat, hydrocarbon generation, hydrocarbon expulsion and migration and accumulation history) and "transport and storage," The study on the geochemical characteristics and hydrocarbon generation potential of the key shales in northeast Jiangxi Province can provide theoretical and practical basis for the breakthrough of marine shale gas exploration in Lower Yangtze.
【作者单位】：贵州省煤田地质局实验室;煤层气资源与成藏过程教育部重点实验室;中国矿业大学;
【基金】：江苏省自然科学基金“下扬子高演化页岩储层孔隙结构特征对储层微观非均质性的影响”(BK20150176) 江西省重大科技专项“江西省页岩气富集规律及地质选区关键技术研究”课题三“页岩气赋存机理、富集规律及可采性研究”(20124ABE02103)、课题七“页岩气地质选区技术方法”(20124ABE02107)
【分类号】：P618.13

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