下扬子区海相盆地改造与成藏关键要素

下扬子区古生界海相盆地晚中生代（T₂末）以来经历了晚印支-早燕山期（T₃-J₂）对冲挤压、中晚燕山期（J₃-K₁）左行走滑错移及喜马拉雅期（K₂-E）伸展拆离3期性质完全不同的构造运动的变形改造，使得海相实体的赋存状况和地质结构极其复杂。与之对应，下扬子海相成烃-成藏分为加里东期-早印支期初次生烃-早期成藏、晚印支-燕山期破坏调整、早喜马拉雅期二次生烃-晚期成藏3个阶段。对黄桥、句容含油构造及泰山古油藏等典型解剖表明，现实的油气聚集主要以晚期成藏为主，海相实体赋存状况及其地质结构、有效烃源、有效保存条件成为晚期成藏的关键要素。

Marine basin reformations and accumulation factors in Lower Yangtze region

The Paleozoic marine basins in the Lower Yangtze region have experienced 3 stages of tectonic movements since the late Mesozoic including face-to-face compression from the late Indosinian to the early Yan-shanian, sinistral strike slip from the middle to the late Yanshanian, and detachment during the Himalayan period, which made the occurrence and geologic structure of marine basins very complicated. In accordance with the tectonic movements, hydrocarbon generation and accumulation in the marine basins in the Lower Yangtze region also went through 3 periods including initial hydrocarbon generation and early accumulation from Caledonian to the early Indosinian, destruction and adjustment from the late Indosinian to Yanshanian, and secondary hydrocarbon generation and late accumulation during the early Himalayan period. Studies of the Huangqiao, Jurong and Taishan areas show that the current oil and gas pools mainly formed during the late accumulation period. Marine basin occurrence and their geologic structure, effective hydrocarbon source and preservation conditions are key factors for the late accumulation of hydrocarbon.