洪浩尔舒特凹陷非构造油气藏的形成及勘探前景——以洪东洼槽为例
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摘要
以洪东洼槽为例 ,根据其钻井剖面、地震测线及测试资料 ,结合油气勘探现状 ,运用沉积学、层序地层学等多学科理论 ,以沉积、构造演化入手的油气地质动态综合分析法为思路 ,对洪东洼槽的基本成油条件进行深入分析 ,总结其油气勘探成功、失利的原因和油气分布规律 ,寻找有利勘探方向 .结果表明 :早白垩世阿尔善期湖盆的碎屑物质主要来自陡岸 ,在纵向上形成多套自生自储式含油组合 ;在平面上形成多期继承、叠加连片的非构造圈闭 .最后指出阿上段、阿中段是油气钻探的主要目的层段 ,努格达构造带下倾部位是非构造油气藏形成的有利部位和有利勘探方向
Based on drilling profile, seismic profile, testing data,and present situation of oil gas exploration in Hongdong sub sag, the basic conditions of hydrocarbon reservoir formation in the eastern sub sag are analyzed thoroughly by means of the theories of sedimentology, sequence stratigraphy and so on. The reasons for the success or failure in oil gas exploration are summarized, and the pattern of oil gas distribution is discussed in order to find favorable exploration direction. It is shown that the clastic deposit of lake basin mainly comes from steep bank in Aershan phase, early Cretaceous. Several oil bearing assemblages of source and reservoir in the same bed are formed in vertical direction; a non structural trap is formed in horizontal direction, which is succeeded and superposed in several stages. Finally, it is pointed out that the Upper and the Middle of Aershan Formation are the main target stratum of exploration; the downdip position in Nugeda structural belt is the best position for non structural oil gas pool, and it is also the most favorable exploration direction.
Based on drilling profile, seismic profile, testing data,and present situation of oil gas exploration in Hongdong sub sag, the basic conditions of hydrocarbon reservoir formation in the eastern sub sag are analyzed thoroughly by means of the theories of sedimentology, sequence stratigraphy and so on. The reasons for the success or failure in oil gas exploration are summarized, and the pattern of oil gas distribution is discussed in order to find favorable exploration direction. It is shown that the clastic deposit of lake basin mainly comes from steep bank in Aershan phase, early Cretaceous. Several oil bearing assemblages of source and reservoir in the same bed are formed in vertical direction; a non structural trap is formed in horizontal direction, which is succeeded and superposed in several stages. Finally, it is pointed out that the Upper and the Middle of Aershan Formation are the main target stratum of exploration; the downdip position in Nugeda structural belt is the best position for non structural oil gas pool, and it is also the most favorable exploration direction.
引文
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