准噶尔盆地阜康断裂带构造演化与油气成藏

Structural Evolution and Hydrocarbon Accumulation of Fukang Fault Zone in Junggar Basin

阜康断裂带位于准噶尔盆地博格达山山前,受海西、燕山、喜马拉雅等多期次构造运动叠加影响,其构造变形及油气成藏过程复杂。地质综合研究认为,早二叠世晚期博格达海槽开始闭合造山,形成了博格达山前中二叠统将军庙组沉积期前陆型箕状坳陷,之上的中二叠统平地泉组潟湖相白云质泥岩是该区的主力烃源岩;燕山运动期发生3幕强烈运动,是阜康断裂带的主要改造期;喜马拉雅运动南北强大挤压应力使阜康断裂带下盘发育了冲断型类前陆盆地的箕状凹陷,上盘发生冲断推覆。3期强烈的构造运动,控制了该区的构造格局和油气成藏。

Fukang fault zone is located in piedmont of Bogda mountain in Junggar basin. Influenced by superimpositions of multistage sub tectonic movements of the Hercynian, Yanshan and Himalayan, its structural deformation and hydroearbon accumulation process were com plicated. Comprehensive geological studies suggest that at the late of Early Permian the Bogda trough began to closing, forming the foreland halfgrabenlike depression of the Middle Permian Jiangjunmiao depositional stage in the piedmont of Bogda mountain, above which the la goon facies dolomitie shale of the Middle Permian Pingdiquan formation is the major hydrocarbon source rock in this area; the Yanshan movement period that occurred three episodes of strong movements is the main reconstructive stage in Fukang fault zone; the powerful ex trusion stress of Himalayan movement allows Fukang fault zone＇ s footwall to develop the halfgrabenlike sag of thrusttype foreland basin and the thrust nappe at upper wall. The threestage strong tectonic movements control the structural framework and hydrocarbon accumula tion in this area.