满加尔凹陷不整合面对志留系油气藏的控制作用探讨

Study of Manjiaer Depression Unconformities' s Role in Control of Silurian Gas- oil Reservoir

通过对塔里木盆地满加尔凹陷主要构造不整合分布的研究,认为对志留系油气藏起控制作用的主要为奥陶纪末(TS)和中泥盆世末(TD)两期不整合。主要构造不整合显示出一定的分布特征,大体从隆起区、斜坡区和凹陷区,常由高角度不整合、微角度不整合或平行不整合到整合接触带。高角度不整合带对志留系油气藏有一定的促进和破坏作用。通过分析不整合的特性,对志留系油气的运移、聚集、成藏研究有着重要的意义。

Through study on tectonic unconformities distribution of Silurian on manjiaer depression, it is considered that latest Ordovieian and the end of the middle Devonian unconformities control Silurian gas - oil reservoir. Three kinds of unconformity zone specifically develop in the uplift, downslope and depression zone, which are the high angular unconformity zone, the lower angular unconformities zone and the parallel unconformity or conformity zone. The distribution of the angular unconformities can not only play an important role in the distribution, migration, ac- cumulation and buildup reservoir of oil or gas, but also destroy the oil or gas reservoir to some extent. Classifying the developing and characteristics of the tectonic unconformities can accelerate the research of the migration , accu- mulation and reservoir of oil and gas.