PETROLEUM SYSTEMS IN THE HONGZE SAG, THE NORTH JIANGSU BASIN
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摘要: 洪泽凹陷是位于苏北盆地最西部的一个中小型断陷,可划分为管镇、顺河、苏巷和嘉南等4个含油气系统,其中前两者的油气成藏条件相对较好但差异较大,又可分别划分为南北2个成藏体系。在成藏体系中,大规模的油气运移与构造圈闭的形成基本同步,三垛运动是控制油气成藏与分布的关键时期。构造沉降和热演化是影响含油气丰度的主控因素,烃源岩成熟时间晚、程度低,具有低熟、低充注的成藏特点。管南和顺南成藏体系中的深断带、管北和顺北成藏体系中的深斜带油气成藏条件相对最好,管北和顺北成藏体系中的其他区带成藏条件较差,仅在靠近烃源岩的部位(枢纽带)较好。Abstract: The Hongze Sag is a middle-small rift located in the west end of North Jiangsu Basin.It can be divided into 4 petroleum systems as the Shunhe,Guanzhen,Suxiang and Jia'nan,among which the Shunhe and Guanzhen petroleum systems are favorable but distinguished.Further more,the petroleum systems of Shunhe and Guanzhen can be divided respectively into 2 accumulation systems as the northern and the southern ones.Within the accumulation system,migration takes place almost the same time as trap formation.The Sanduo Movement is the key period to control petroleum accumulation and distribution while tectonic subsidence and geothermal history are the key factors to affect abundance.Insufficient reservoirs are formed due to the later time and lower maturation of organic matters.The best plays for oil accumulation are the deep-fault belts in the Southern Guanzhen and Southern Shunhe accumulation systems,and the deep monocline belts in the Northern Guanzhen and Northern Shunhe accumulation systems.Other belts in the Northern Guanzhen and Northern Shunhe accumulation systems can also be favorable,especially the belts near source rocks.
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