【摘要】 东海西湖凹陷形成于库拉—太平洋板块向欧亚板块俯冲的弧后环境 ,盆内的第三系沉积厚万余米。盆地经历过多次构造反转 ,形成多个广泛分布的区域性不整合面。综合分析表明 ,分隔裂陷和拗陷期充填的 T03 界面代表裂后不整合面 ,T02 和 T01 界面代表了与挤压反转有关的 2个区域性角度不整合 ,其最大剥蚀量分别达 1 0 0 0 m、 2 5 0 0 m和 30 0 0 m。挤压反转不整合面的最大剥蚀带与强烈的挤压断褶带分布相一致。不整合面的分布和剥蚀量的大小与盆地内的油气聚集密切相关。更多还原

【Abstract】 The Xihu trough in the East China Sea was formed in the backarc setting resulted by the subduction of the Kula- Pacific plate to Euro- Asia plate. The basin was filled with more than 1 0 0 0 0 m of Tertiary clastic deposits.The study results show that it underwent several tectonic inversion events,which generated a number of widespread regional unconformities.The unconformity T0 3separating the synriftfrom the postrift basin filling represents a breakup unconformity.The unconformities T0 2 and T0 1are regional angular unconformities related to compressive basin inversions. The erosion amounts along these unconformities are about1 0 0 0 m( T03) ,2 5 0 0 m( T02 ) and30 0 0 m( T01) respectively,estimated by modeling and calculation along seismic profiles. The larger erosion amount belts are paralled to the stronger deformed zones produced by the inversions.The characteristics of the unconformities and the distribution of the erosional amounts related tectonic events and their influence on hydrocarbon accumulation in the basin are documented in the paper.更多还原