塔里木盆地西南缘构造带的地球物理特征、构造及其演化

The geophysical feature, structure, and evolution of the tectonic belt in the southwest margin of the Tarim basin

中国新星石油公司西北石油局第一物探大队,乌鲁木齐 830011

the First Party of Geophysical Prospecting, Northwest China Petroleum Bureau, China National Star Pctroleum Corporation, Urumqi 830011

本文依据塔里木盆地西南缘构造带的重力异常,大地电磁测深以及天然地震波速和航磁异常等地球物理资料,并结合该区的构造地质特征,将研究区划分为西昆仑叠瓦逆冲推覆带,推覆体前缘断褶带和外缘坳陷带。分析并探讨了该构造带的演化历史。提出了塔里木盆地西南缘构造带的形成受控于陆内俯冲作用的观点,并建立了塔里木和西昆仑之间的陆内俯冲模式。最后通过对塔西南前陆盆地构造条件分析,指明了有利的油气勘探方向。

on the basis of thc geophysical data such as the gravity anomaly,magnetotclluric sounding,natural earthquake waue vclocity,and acromagnetic anomaly, together with the tectonic geologic feature,the research area can be divided into the imbricatcd thrust nappe belt of thc western K unlun,forefront fault-fold belt,and cxternal depression belt. The evolution history of the tectonic belt is analyzed and discussed. It is proposod that the tectonic belt is controlled by the intracontmental subduction action,and the pattern of intracontinental subduction for Tarim and western Kulun is constructed. Finally,by tho analysis of the tectonic condition for the foreland basin in the southwest Tarim,the favorable direction for hydrocarbon cxploration is pointed out.