伸展褶皱作用及其油气勘探意义  

Extensional Folding and Its Significance for Oil-Gas Exploration

作　　者：汪新文[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2008年第1期60-69,共10页Geoscience

摘　　要：伸展褶皱是张性盆地区构造变形的重要组成部分,其分布相当普遍,多属于与正断层相关的褶皱。伸展褶皱的分类可以采用褶皱轴向与成因类型相结合的方案。按褶皱轴向与相关正断层或区域构造线的关系可分为纵向、横向和斜向褶皱3大类;按褶皱作用的成因机制又可分为伸展断弯褶皱、伸展断展褶皱、断层牵引褶皱、逆牵引褶皱、均衡褶皱、断层位移梯度褶皱、构造变换带褶皱、横向收缩褶皱、转换伸展褶皱等多种类型。伸展褶皱是伸展型盆地中最重要的油气圈闭构造,而且可以控制沉积相带的分布,有利于形成良好的储集岩系,促进油气运移,并与断层、岩性、地层相结合形成多种类型的复合油气藏,控制油气的富集区带。Extensional fold is an important component part of tectonic deformation in tensional basins, which distributes widely, and mostly belongs to normal fault-related folds. It is suggested that the classification of extensional folds incorporates both axial trend and mechanism of folds. Extensional folds are divided into three principal types including longitudinal, transverse and oblique folds on the basis of the relationship between the axial trend of fold and the strike of associated normal fault or regional structures, furthermore, extensional faultbend folds, extensional fault-propagation folds, fault-drag folds, reverse-drag folds, isostatic folds, displacement-gradient folds, folds in accommodation zones, transverse constrictional folds, transtensional folds and so on by the folding mechanism. Extensional folds provide the most important structural trap of oil-gas for tensional basins, moreover may influence the distribution of sedimentary facies that favour the development of good reservoir rocks, promote oil-gas migration, and can form various compound oil-gas reservoirs by combining with faults, lithology and strata, consequently control petroleum accumulation areas.

关 键 词：伸展褶皱 正断层 形成机制 油气勘探 张性盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]