巴彦浩特盆地的构造类型

STRUCTURAL TYPES AND ITS RELATION WITH OIL AND GAS OF BAYANHOT BASIN

巴彦浩特盆地的构造演化经历了由早期的挤压变形向晚期的伸展变形的构造转换 ,因此 ,盆地内发育有多种构造类型 ,从断裂的性质看 ,既有正断层 ,又有逆断层和走滑断层 ;从构造的组合型式上看 ,既有挤压型构造组合 ,又有伸展型构造组合 ,其中挤压型构造组合包括叠瓦状逆冲断层组合、滚板构造、冲起构造和铲形逆断层与牵引背斜、牵引向斜组合 ;伸展型构造组合包括铲形正断层与反向断层、滚动背斜组合及地垒和地堑组合两种型式。滚板构造、冲起构造和铲形逆断层与牵引背斜、牵引向斜组合对油气的聚集最为有利。

The structural evolution of Bayanhot Basin underwent a structural transform from compressional deformation to extensional deformation. So, a lot of structural types were developed in the basin. Normal fault and strike slip fault all can be found in the studied area. According to the stress environment, the structural assemblage types of Bayanhot Basin may be divided into two major types, six basic types, i.e. Compressional structural assemblage, including imbricate thrust assemblage, trap door structure, pop up structure, assemblage of listric thrust and dragged anticline and dragged syncline; extensional structural assemblage, including assemblage of listric normal fault, fault and roll over anticline and horst graden assemblage. Trap door structure, pop up structure, and assemblage of listric thrust, dragged anticline and dragged syncline are most favorable to the accumulation of oil and gas.