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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。
The West Lake Sag in the East China Sea formed an arc-back environment subducted from the Kura-Pacific Plate to the Eurasian Plate. The Tertiary sedimentary thickness in the basin was over 10,000 meters. The basin has undergone many structural inversion and formed a number of widely distributed regional unconformities. The comprehensive analysis shows that the T03 interface, which is filled with delimitation and depressions, represents the post-fault unconformity. The T02 and T01 interfaces represent two regional angular unconformities related to extrusion inversion, and the maximum erosion amount is 1 0 0 0 m, 2 0 0 0 m and 30 0 0 m. The maximum erosion zone of the crushed unconformity is consistent with the intense crustal fold distribution. The distribution of unconformities and the amount of erosion are closely related to the accumulation of hydrocarbons in the basin.