柴北缘冷湖地区构造建模和构造分析

通过采用先进的地质解释软件,对柴北缘冷湖地区的三维地震资料进行解释,建立起该区域新生代的三维构造模型。研究区新生代构造主要是由断层F2活动引起的断层相关背斜,发育3条主要断层F2、F5和F6,均具有右行走滑冲断的性质。结合区域地质资料及断层F2的几何学和运动学特征,认为该断层和它的相关背斜为油气的二次运移和聚集提供了较好的通道和构造圈闭。

THREE-DIMENSIONAL STRUCTURE MODELING AND STRUCTURAL ANALYSIS OF THE LENGHU AREA ON THE NORTHERN MARGIN OF QAIDAM BASIN

Through the interpretation of three-dimensional seismic profiles and by the use of the advanced geologic software, the Cenozoic underground three-dimensional structural model of Lenghu area on the northern margin of the Qaidam Basin is established. By observing and analyzing the three-dimensional structural model it can be discovered that the Cenozoic structure in the Lenghu area is a fault-related anticline resulted from fault F2. Three major faults, i.e., F2, F5 and F6, occur in the Cenozoic in the Lenghu area, and the faults in T2′ surface dextrally cut across the contour, which reflects that the faults are of the dextral strike-slip thrust type and were resulted from a wrenching stress field. The dextral strike-slip thrust faults in the Lenghu area are closely related to the Altun Tagh structural belt, which is a sinistral strike-slip thrust belt developed in the Cenozoic. Via analysis of the regional geologic data and the geometry and kinematics of fault F2, it can be concluded that the fault F2 and its related fold provide excellent channels and structural traps for hydrocarbon migration and accumulation.