柴达木盆地北缘的右行走滑冲断系统及其动力学  

Right-lateral strike-slip thrust system and its dynamics along the northern margin of Qaidam basin

作　　者：肖安成[1] 杨树锋[1] 程晓敢[1] 党玉琪 陈新领 陈元忠 王亮[1] 

机构地区：[1]浙江大学地球科学系,浙江杭州310027 [2]中国石油青海油田分公司,甘肃敦煌736200 [3]中国石油东方地球物理公司敦煌分院,甘肃敦煌736200

出　　处：《石油与天然气地质》2006年第4期482-487,494,共7页Oil & Gas Geology

基　　金：国家"十五"科技攻关资助项目(2004BA616A-04-01);中国石油青海油田分公司资助项目(02-107401-7)

摘　　要：通过对于断裂系统分析和地球物理资料的解释,证实了柴达木盆地北缘西段的主要构造形成时间为上新世以后,变形样式为一系列右行走滑冲断构造。走滑冲断构造带内部的断层在平面上呈分支复合,剖面上表现为正花状构造,断层上、下盘地层层序无法直接对比。右行走滑冲断构造形成于南祁连由北向南的斜向推覆作用,而主要应力来源于柴达木地块北缘由南向北的陆内俯冲作用。用一个运动学模型解释了柴北缘的右行走滑冲断作用机制。Interpretation of geophysical data and analysis of fault systems confirm that structures in the northern margin of Qaidam basin were formed after the Pliocene and occur as a series of right-lateral strike-slip thrusts. The faults within the strike-slip thrust belts occur as structure in sectional view, thus direct correlation of strata between the hanging wall and footwall is impossible. The formation of the right-lateral oblique thrust belts were controlled by the N-S oblique thrusting of South Qilian Orogeny and the main terrestrial stress came from the SN intracontinental subduction of the north margin of Qaidam massive. To interpret the right-lateral strike-slip thrusting, a kinematics model is also provided.

关 键 词：右行走滑 冲断构造 运动学 柴达木盆地 南祁连山 

分 类 号：TE112.2[石油与天然气工程—油气勘探]