河套盆地临河坳陷油气成藏地质条件分析

发布时间：2018-03-24 12:37

本文选题：临河坳陷　切入点：成藏条件　出处：《西安石油大学》2015年硕士论文

【摘要】：本文是在构造地质学、沉积学以及石油地质学等相关理论指导下,运用区域地质研究资料和地震解释资料,在前人相关研究基础上,通过野外踏勘剖面和露头地质调查,地球化学测试分析,以及测井、录井资料和现场岩心观察,进行区域构造背景、盆地结构、地层、沉积相分析;对比早白垩系烃源岩和渐新统烃源岩的分布特征和地球化学生油及演化指标,分析油气运移、成藏和保存条件之间的关系,总结出临河坳陷内油气成藏与保存条件,初步预测出有利区带,对下一步油气勘探,具有一定的指导意义。研究区北部山前的沉积中心为最好的气源岩分布区,渐新统、下白垩统暗色泥岩发育,达到生油岩成熟门限,为临河坳陷的两套生油岩系,砂岩发育,厚度大,孔隙多,渗透性好,也是有利的储集层。临河坳陷东、西杭五断层,南部断隆区,东部斜坡区西段及北部坳陷北缘为含油气较有利区。渐新统、下白垩统圈闭面积1593.8km2,圈闭类型为半背斜、断块、断鼻、背斜,成因均与断层活动有关,是石油聚集的良好场所。
[Abstract]:Under the guidance of related theories such as tectonic geology, sedimentology and petroleum geology, this paper applies regional geological research data and seismic interpretation data, based on previous relevant studies, through field exploration profiles and outcrop geological surveys. Geochemical test analysis, well logging, logging data and on-site core observation, regional tectonic background, basin structure, formation, sedimentary facies analysis; By comparing the distribution characteristics and geochemical oil generation and evolution indexes of early Cretaceous source rocks and Oligocene source rocks, the relationship among hydrocarbon migration, reservoir formation and preservation conditions is analyzed, and the conditions of oil and gas accumulation and preservation in Linhe depression are summarized. The preliminary prediction of favorable zones is of certain guiding significance for further oil and gas exploration. The sedimentary center in the north of the study area is the best gas source rock distribution area, and the Oligocene and Lower Cretaceous dark mudstone developed to reach the maturation threshold of oil source rocks. It is a favorable reservoir for the two sets of oil source rock series in Linhe depression, with large sandstone, large thickness, large porosity and good permeability. The east, west Hangzhou five faults in Linhe depression and the south fault uplift area, The western section of the eastern slope and the northern margin of the northern depression are favorable areas for oil and gas. The Oligocene and Lower Cretaceous traps have an area of 1593.8km2. The trap types are semi-anticline, fault block, fault-nose, anticline, and genesis are all related to fault activity and are good places for petroleum accumulation.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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