下扬子区中生界油气地质条件评价

EVALUATION ON THE GEOLOGIC CONDITIONS OF THE MESOZOIC HYDROCARBONS IN THE LOWER YANGTZE AREA

下扬子区中生界具有海相和陆相两种盆地沉积的特点，分别发育了海相烃源岩和陆相烃源岩。下三叠统海相烃源岩是下扬子区最有利的烃源岩，陆相沉积也具有一定的生烃潜力。印支－燕山运动对原海相盆地进行了严重的改造，对海相油气圈闭保存有重大影响，同时对陆相烃源岩也有重要的控制作用。然而，在构造活动相对薄弱的地区。特别是区内几个重要的中生代盆地，仍有良好的油气勘探前景。

Abstract The Mesozoic group in the Lower Yangtze area possesses the features of both marine and continental basinal deposits, and develops marine and continental hydrocarbon source rock, respectively. The Lower Triassic marine source rock is the most favorable one in the Lower Yangtze area, and the continental deposit has certain hydrocarbon generating potential. Indosinian Yanshanian movement greatly reforms proto marine basins, takes significant effect on the preservation of marine hydrocarbon traps, and meanwhile has important control over continental source rock. However, the prospects for hydrocarbon exploration are still good in the areas with relatively weak tectonic movement, especially in some major Mesozoic basins within the area.