帕米尔东北缘冲断带新生代构造变形特征及油气控制作用

在地表构造解析和地震剖面解释的基础上,分析了帕米尔东北缘冲断带新生代构造变形特征,提出作为冲断带前锋断层的乌泊尔断裂在不同地区存在不同的底部滑脱层.地表踏勘和高分辨率地震资料证实:乌泊尔断裂在波孜塔格附近以西沿古新统膏泥岩层滑脱,而以东则沿上白垩统泥灰岩和古新统膏泥岩层滑脱;其控制了深部隐伏冲断体系和浅部第四纪背驮盆地的形成.研究结果表明,帕米尔北缘冲断带新生代构造变形活动开始于中新世末期—上新世早期,并持续至今,对油气聚集和晚期成藏具有重要的控制作用.

Cenozoic structural deformation of the thrusting zone and its control on hydrocarbon accumulation in northeastern Pamir

Based on geological survey and recently acquired high-resolution seismic profiles,this paper mainly analyzes the structural characteristics of the Cenozoic thrusting belt in NE Pamir,and suggests the detachments of the Wupor fault which is the forward fault of NE Pamir thrusting belt for different regions.The outcrops and seismic characteristics showed that the Wupor fault slipped along the gypsum-mudstone layer inside the Paleocene strata in the western Bozitag.However,it slipped along both the upper Cretaceous marl and the Paleocene gypsum-mudstone in the eastern Bozitag.There was a blind thrusting system in the lower part and a Quaternary piggy-back basin in the upper part controlled by the Wupor fault.The results indicate that the Cenozoic deformation of NE Pamir thrusting belt might have began in the late Miocene-early Pliocene and lasted to present.It also controlled the accumulation of hydrocarbon in this area.