西湖凹陷含油气系统研究

西湖凹陷位于东海陆架盆地中部。在该凹陷内发育了 10 0 0 0余米厚的新生代地层。从构造背景、层序地层格架、烃源岩、储集岩、盖层和油气的运移及聚集等各个方面对西湖凹陷含油气系统 ,特别是平湖组和花港组含油气系统进行了较为系统的研究。结果表明 ,西湖凹陷的区域地质背景有利于含油气系统的形成、演化和保存。含油气系统的诸要素及诸地质作用具有非常理想的时空配置关系。在西湖凹陷内所识别出的四类含油气系统中 ,平湖组自生自储含油气系统和花港组古生新储含油气系统最为重要。西湖凹陷的油气勘探应坚持以平湖组含油气系统为主 ,其次是花港组含油气系统 ,兼探中新世、上新世含油气系统 ,准备深探古新统下始新统新生古储含油气系统

RESEARCH ON THE OIL-BEARING SERIES OF XIHU DEPRESSION

Xihu depression is situated at the middle of the Donghai shelf basin. The Cenozoic strata are developted in the depression. The tectonic setting, sequence stratigraphic framework, resources rocks, reservoir rocks, seal rocks, migration and collection of oil-bearing series petroleum systems of Xihu depression are studied. The oil-bearing series of Pinghu Formation and Huagang Formation are analyzed in detail. The results of study show that the regional geological setting is benefit to the formation, evolution and reservation of the oil\|bearing series in Xihu depression. The factors and various geological actions on the oil\|bearing series have good matching of time and space. Four petroleum systems have been recognized in the depression. The self-generation and self reservation petroleum system of the Pinghu Formation as well as the underlying generation and upper reservation petroleum system of the Huagang Formation may be the most important. It is suggested that the oil-bearing series of Pinghu Formation should be putted on the first position in oil and gas exploration, then those of Huagang Formation, the Miocene-Pliocene and the Palaeocene-lower Eocene as in turn.