东海西湖凹陷地层超压与油气运聚的关系

Relationship Between Formation Overpressure and Oil and Gas Migration and Accumulation in Xihu Depression, East China Sea

西湖凹陷是位于东海陆架盆地上的断陷盆地,是我国近海重要的勘探区块,经过四十年的勘探实践发现凹陷内深部地层普遍发育超压,其超压形成机制主要为生烃(气)作用。并且超压对该区油气成藏有着明显的控制作用,本文分析了西湖凹陷超压对油气初次运移、二次运移以及油气保存等多方面的影响,并同时又指出较为有利的勘探方向,具有一定创新性并对该区的油气勘探有着较好的实践意义。

The Xihu Depression in the East China Sea Shelf Basin is an important natural gas explorati-on area in the East China Sea region.After decades of exploration,it has been confirmed that there is widespread stratigraphic overpressure in the deep layers of the depression,and its formation mechanism is mainly hydrocarbon generation(gas).And overpressure has a significant control effect on the oil and gas in the area.This article analyzes the impact of overpressure in the Xihu Depression on the initial and secondary migration of oil and gas,as well as the preservation of oil and gas.At the same time,it also points out more favorable exploration directions,which are innovative and have good practical significance for oil and gas exploration in the area.