阜康断裂带西段几何学分析及构造建模

Geometrical Analysis and Structural Modeling of Western Fukang Fault Zone

阜康断裂带西段经历多期构造运动,发育复杂的断裂系统,使断裂的识别和构造建模较为困难。以断层相关褶皱理论为基础,分3步建立其三维构造模型:利用地质、测井和地震资料,对山前褶皱带中地震剖面空白带进行地层及地层倾角标定;对标定的地震剖面进行等倾角区划分和轴面分析,对全区骨架剖面进行几何学分析,以确定构造模式;进行二维、三维联合地震解释,将解释数据利用EarthVision软件建立全区的三维立体模型。研究结果表明,该区平面上发育东西向或近东西向展布的断裂系统,纵向上有2套构造层,其中阜康断裂与甘河子断裂之间的掩伏构造和岩性圈闭是油气勘探的有利区域。

The westeru Fukang fault zone underwent multi-stage tectonic movements and the complex faulting systems were developed, which caused the fault identification and the structural modeling were difficult. Based on the theory of fault-related folding, the 3D structur- al model has been developed in three steps： 1） complex seismic profiles are calibrated with stratum and stratigraphic dip by means of geo- logic, well logging and seismic data; 2） the iso-dip domain division and axial plane analysis based on the calibrated seismic profiles as well as geometrical analysis of the framework in the whole area are conducted, so as to develop the structural model of the target area; 3） the 2D and 3D integrated seismic interpretation data are used to develop 3D model for the whole area using Earth Vision software. The studied re- suits show that there are two sets of regional fault systems laterally distributed in EW or near EW and two sets of structural zones in verti- cal. And the overthrust structures and lithologic traps between Fukang fault and Ganhezi fault are favorable zones for oil and gas explora- tion in this area.