层滑冲断带的细结构研究──以新疆塔北地区为例

STUDY ON THE FINE STRUCTURE OF LAYERSLIP THRUST ZONE-TAKING THE NORTHERN TARIM AREA, XINJIANG AS AN EXAMPLE

基于新疆塔北地区30余条层滑断裂带的地质、地球物理和岩石物性参数的详细观察，发现由主干断裂派生的相关断裂叠次出现，有序展布，不论在野外露头或是在地震剖面上均表现得很清楚。综合其主干断裂从下盘至上盘的各种特征，层滑冲断带的细结构被划分出五个带，即：（1）下盘短切冲断层带；（2）主干冲断层带；（3）毗邻冲断层带；（4）外延冲断层带；（5）尾随张裂构造带。最后还叙及了层滑冲断带细结构研究的石油地质意义。

Based on observations of the geology, geophysics and rock physic property to more thanthirty zones of layerslip thrusts, it is quite clear that multi-occurrence and order-distributionof the relative faults in dominant fault were discovered not only in field outcrops but also inseismic cross sections. In light of synthetic various characteristics of the dominant fault fromthe foot wall to up wall of a fault zone, five belts within fine structures to the layerslipthrust zone have been subdivided, i. e. (1) the short cut thrust belt at the foot wall; (2) thetrunk thrust belt; (3) the border thrust belt; (4) the vergent thrust belt; (5) the tail behindstructure (tensile fracture structure). Finally, the significance of petroleum geologystudying on the fine structure of layerslip thrust zone has been also explained in the present paper.