东海西湖凹陷中南部含油气系统浅析

The General Analyses of Petroleum System in Middle South of Xihu Trough, East China Sea

本文分析了西湖凹陷中南部含油气系统基本地质要素和事件 ,认为 :西湖凹陷中南部烃源岩有机质丰度中—高、有机母质类型为III腐殖型 ,储集砂体发育、类型多 ,砂岩具有Ⅱ、Ⅲ类储集条件 ,上覆泥质岩的封盖性能好。在平湖构造带、苏堤构造带烃的生成、运移和圈闭形成在时空上相匹配 ,具良好的油气资源前景。

Based on the basic geological elements and events of petroleum system in Middle South of Xihu Trough, the abundance of organic matter of source rock in Middle South of Xihu Trough is medium to high, the kerogen type is Ⅲ humic. There develop bunches of various reservoir. The quality of reservoirs in petroliferous zone ranks to be Ⅱ to Ⅲ grade reservoir. The overlaid mudstone has good capacity for sealing. Pinghu and Sudi Structural Belt are promising as the petroleum occurrence, migration and entrapment are quite a match in time and space.