下扬子区海相油气勘探选区评价研究

下扬子区中古生代发育了多类型的盆地，构建了海相下组合、上组合2套成油气组合，但受印支期—中燕山期、晚燕山期—喜马拉雅期构造改造和盆地叠加，海相层系油气生成演化、运聚成藏十分复杂，难以用传统的方法进行有利区带优选。从“源—盖控烃”出发，通过对加里东末期、印支末期、中燕山末期及现今等关键时期烃源灶与盖层的匹配组合关系研究和有利油气聚集与保存区的预测，利用多层多期多元复合成藏预测模型预测了有利油气勘探区。 

Evaluation of selected areas for petroleum exploration in marine strata of Lower Yangtze region

From Paleozoic to Mesozoic, multiple types of basins developed in the Lower Yangtze region, forming 2 sets of petroleum assemblages of marine facies (the lower one and the upper one). Influenced by the tectonic deformation and basin superposition during Indosinian-middle Yanshanian and late Yanshanian-Himalayan periods, the generation, evolution, migration and accumulation of petroleum in marine strata are very complicated. As a result, it is difficult to select favorable zones for petroleum exploration in traditional ways. Based on the theory of “source and cap rocks control hydrocarbon”, the relationships between hydrocarbon kitchen and cap rock at the end of Caledonian, the end of Indosinian, the end of middle Yanshanian and present days are discussed, and the favorable zones for petroleum accumulation and preservation are predicted. An accumulation prediction model of multiple layers, stages and elements is applied to point out favorable zones for exploration.