断层传播褶皱在川西莲花山构造解释中的应用

断层传播褶皱是前陆盆地中发育的一种重要构造样武,往往出现在冲断构造带的前缘隐伏前锋带.断层传播褶皱、断层转折褶皱与滑脱褶皱共同构成了断层相关褶皱的三种基本类型,是重要的油气圈闭构造.通过对莲花山地区地震剖面的构造精细解释,结合野外剖面调查、钻井倾角测井资料分析,发现川西盆地南段莲花山构造为-发育在古隆起背景上的、具反转性质的断层传播褶皱.此褶皱走向为北东向,剖面上表现为北西翼缓、南东翼陡的不对称箱状背斜.

Application of the fault-propagation fold theory in structural analysis of Lianhuashan in West Sichuan Basin

Fault-propagation fold is an important tectonic style developed in a foreland basin.It usually occurs in an area covered seclusively in the front of a thrust belt.There are three basic type faults,that is,fault-propagation fold,fault-bending fold and detachment fold.All of them are important hydrocarbon traps.After a detailed structure interpretation of the Lianhuashan seismic profile,combined with the field geological section survey and the analysis of the drilling dipmeter logging information,the authors find that the Lianhuashan structure in the south of West Sichuan foreland basin is a classical fault-propagation fold developed on the palaeohigh background and with an inversion structure character.This fold is north-westward.In the section,it shows that it is a anisomerous box anticline whose north-west limb has a mild stratigraphic dip and south-east limb has a deep one.