塔里木盆地主要构造不整合的分布特征及其与对油气成藏的控制作用

塔里木盆地是经历了多个原型盆地发育演化的大型叠合盆地，具有多期构造运动，发育多个区域构造不整合面。通过对构造层序和主要构造不整合分布的研究，总体上可以将塔里木盆地划分为5个一级构造层序和13个二级构造层序；主要构造不整合显示出一定的分布特征，大体从隆起区、斜坡区和坳陷区，常由高角度不整合、微角度或平行不整合到整合接触带。高角度不整合带，对油气的分布、运聚成藏起着一定的促进作用和破坏作用。不整合的发育，可以成为油气侧向运移的良好通道；可以为油气提供良好的储集场所和空间；也可以使先期油气藏遭到破坏和封闭重建，发生二次成藏。阐明不整合界面的特征，可以对分析盆地演化、古隆起古地貌恢复提供有利的依据．对油气的运移、聚集、成藏研究有着重要的意义。

DISTRIBUTION AND PATTERN OF MAJOR TECTONIC UNCONFORMITIES IN THE TARIM BASIN AND THE RELATIONSHIP BETWEEN GAS- OIL RESERVOIR AND THESE UNCONFORMITIES

The Tarim Basin is a large-scale overlapped basin which underwent basin evolutionary processes of several prototype basins and tectonic movements,developing several regional tectonic unconformities.As a whole,there are 5 first-class tectonic sequences and 13 second-class tectonic sequences in the Tarim basin by this research of the tectonic sequence and the pattern of the unconformities;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,accumulation and buildup reservoir of oil or gas,but also destroy the oil or gas reservoir to some extent.The unconformities can lead to oil and gas accumulation to form different oil and gas reservoirs as a side passage and provide favorable space for oil and gas deposite.Moreover,the unconformities can destroy the previous overlap trap and rebuild a overlap trap for oil and gas deposite.Classifying the developing and character of the tectonic unconformities not only may provide potent basis for analyzing the evolvement of the basin and to comeback the one-time hunch and relief,but also can accelerate the research of the migration,accumulation and reservoir of oil and gas.