作　　者： ; ; ; ; ; ; ; ; ;

机构地区： 中国石油天然气集团公司中国石油勘探开发研究院

出　　处： 《石油勘探与开发》 2020年第3期512-522,共11页

摘　　要： 塔里木盆地秋里塔格构造带勘探程度低,近年来在中秋构造下盘部署的中秋1井获高产油气流,实现了秋里塔格构造带的战略突破。然而,中秋构造带油气来源和油气成藏尚不明确,开展中秋1井油气来源和中秋1圈闭成藏研究有望为秋里塔格构造带下步油气勘探部署提供重要依据。针对中秋1井开展了系统的油气源对比研究,认为中秋1井原油主要来源于三叠系湖相泥岩,天然气为煤型气,主要来源于侏罗系煤系。油气成藏研究显示,中秋1井原油充注主要发生在新近纪吉迪克组—康村组沉积时期,以三叠系生烃贡献为主;天然气大规模充注发生在新近纪库车组沉积时期,晚期侏罗系生成的煤型气对早期形成的三叠系原油构成大规模气侵;中秋1圈闭形成时期早于或等于三叠系—侏罗系烃源岩生排烃期,活动断裂为油气运移提供输导条件,烃源岩-断裂-圏闭时空有效匹配,中秋构造断层下盘一系列圈闭与中秋1圈闭成藏条件相似,有望成为下步有利勘探方向。 Well Zhongqiu 1 obtained high-yield oil and gas flow in the footwall of Zhongqiu structure,marking the strategic breakthrough of Qiulitag structural belt in the Tarim Basin.However,the oil and gas sources in Zhongqiu structural belt and the reservoir formation process in Zhongqiu 1 trap remain unclear,so study on these issues may provide important basis for the next step of oil and gas exploration and deployment in Qiulitage structural belt.In this work,a systematic correlation of oil and gas source in Well Zhongqiu 1 has been carried out.The oil in Well Zhongqiu 1 is derived from Triassic lacustrine mudstone,while the gas is a typical coal-type gas and mainly from Jurassic coal measures.The oil charging in Well Zhongqiu 1 mainly took place during the sedimentary period from Jidike Formation to Kangcun Formation in Neogene,and the oil was mainly contributed by Triassic system;large-scale natural gas charging occurred in the sedimentary period of Kuqa Formation in Neogene,and the coal-type gas generated in the late Jurassic caused large-scale gas invasion to the early Triassic crude oil reservoirs.The Zhongqiu 1 trap was formed earlier than or at the same period as the hydrocarbon generation and expulsion period of Triassic-Jurassic source rocks.Active faults provided paths for hydrocarbon migration.The hydrocarbon source rocks-faults-traps matched well in time and space.Traps in the footwall of the Zhongqiu structural fault have similar reservoir-forming conditions with the Zhongqiu 1 trap,so they are favorable targets in the next step of exploration.

关 键 词： 塔里木盆地 库车前陆冲断带 秋里塔格构造带 油气来源 油气成藏 中秋

领　　域： []