高石梯—荷包场长兴组岩溶储层特征及主控因素

发布时间：2018-04-01 10:23

本文选题：川中川南过渡带　切入点：长兴组　出处：《西南石油大学》2016年硕士论文

【摘要】：前人研究普遍认为四川盆地内长兴组到飞仙关组为一连续沉积界面,但通过对钻井、录井、及岩心等资料分析发现研究区长兴组钻进时,出现了大量钻具放空现象,岩心上亦可以见到大量的溶沟、溶缝、溶洞及岩溶角砾,通过对资料综合分析认为蜀南地区长兴组与飞仙关组并非连续沉积,其间存在沉积间断,长兴组古岩溶作用发育,形成了长兴组顶部古岩溶不整合。二叠纪末期一次重大海退引起的长时期暴露是研究区长兴组古岩溶形成的主要因素。古岩溶不仅对碳酸盐岩的储集性能具有较强的优化改造能力,且古岩溶不整合面可以作为油气长距离运移的优质通道,岩溶斜坡带亦油气成藏的有利区带。通过掌握和消化已有的研究成果,运用碳酸盐岩岩石学、地层学、碳酸盐岩沉积学等学科的理论和方法为指导,在准确解释长兴组地层岩性的前提下,对研究区长兴组开展了地层的划分与对比,使得地层划分及对比界面更接近等时界面,并提出了研究区长兴组具有二分性且东北部与西南部岩性差异明显。同时结合镜下薄片等手段的研究,系统研究区内长兴组岩石微相类型,阐明区内长兴组储层基本特征、成岩作用类型与特征,探索控制储渗体分布的本质原因。通过上述研究认为研究区长兴组以台缘滩及滩间沉积相为主,主要为碳酸盐岩沉积且泥质含量较少,易受暴露溶蚀且受地貌控制,遂通过测井、地震资料的结合应用恢复了长兴组古地貌,划分了岩溶高低、岩溶残丘及岩溶洼地,提出储层预测的地质模型,指出有利储集区带的分布。
[Abstract]:It was generally believed that Sichuan basin in Changxin to the group of Feixianguan formation is a continuous sedimentary interface, but through the drilling, logging and core data analysis found that the Changxin formation in the research area of drilling, the emergence of a large number of drill core vent phenomenon, we can see a large ditch, dissolved dissolved seams, karst cave and karst breccia on the basis of a comprehensive analysis, data suggest that southern Sichuan Feixianguan Formation in Changxin area, and the continuous deposition of the group is not, during the existence of hiatus, Changxin group of karst development, the formation of the Changxin group of paleokarst unconformity at the top end of the Permian. A heavy sea retreat caused by long period of exposure is the study area of Changxin rock group the main factors for the formation of solution. Not only for the palaeokarst reservoir property of the carbonate rock has stronger ability of optimization, and the paleokarst unconformity can be used as high quality channel long distance migration of oil and gas, oil and gas are karst slope Favorable zone for accumulation. Based on the research results of master and digest the use of carbonate petrology, stratigraphy, theory and method of carbonate sedimentology as the guide, in the premise of accurate interpretation of the Changxin formation lithology, carry out the division and correlation of stratum in the Changxin formation, the stratigraphic division and when the comparison interface closer to the interface, and puts forward the research area of Changxin group has two points and the northeast and southwest lithological difference. And combining with the research methods such as thin section, the system in the study area of Changxin group microfacies, clarify the area of Changxin reservoir into the basic characteristics, types and characteristics diagenesis, reservoir distribution control to explore the nature of the reasons. Through the research that the study area of Changxin group in platform margin beach and beach deposits, mainly for the deposition of carbonate and clay content is less susceptible to exposure After dissolution and geomorphic control, the paleoglandomorphology of Changxin formation was restored by logging and seismic data. The karst height, karst residual and karst depression were divided. The geological model of reservoir prediction was put forward, and the distribution of favorable reservoir area was pointed out.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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