川西绵竹地区构造特征及对油气成藏控制作用

绵竹主体构造为龙门山前构造带关口隐伏断裂的下盘构造，构造样式为研究区断滑褶皱，形成于印支期，在喜山期遭受了一定程度的调整改造，为一古今叠合构造。对研究区构造特征及演化分析表明，构造形成及其演化对研究区圈闭类型、储层发育、油气运移通道有着强烈的控制作用，是绵竹构造油气成藏和富集的主要控制因素。多期构造运动形成的不整合面及断裂为油气运移提供了良好的通道，有效改善了储层孔渗条件，形成的断背斜、背斜为油气聚集成藏提供了良好的场所。

Tectonic features of the Mianzhu structure and their control on hydrocarbon accumulation

The main structure in Mianzhu is the footwall structure of buried Guankou fault located in the Longmen piedmont structural zone. It is a fault-slipping fold formed in the Indosinian period. During the Himalayan movement, it was transformed and modified to some extent, belonging to a superimposed structure. The analysis on the tectonic features and evolution of the Mianzhu structure indicate that the tectonic formation and evolution exert a strong control on the types of hydrocarbon traps, hydrocarbon migration pathway and the development of reservoir, which are main controlling factors of hydrocarbon accumulation and enrichment in the Mianzhu structure. The unconformities and faults which were formed by multiphase structure activities provide good migration pathways and also effectively improve the reservoir porosity and permeability. The faulted anticlines and anticlines of this structure provide good space for hydrocarbon accumulation and enrichment.