准噶尔盆地腹部侏罗系层序地层划分

根据工区内现有的钻井、测井和地震资料,应用以基准面为参照格架的高分辨层序地层学理论与研究方法,对准噶尔盆地腹部侏罗系进行了层序界面的识别.共识别出层序界面7个,对应划分出1个长期基准面旋回和6个中期基准面旋回,长期基准面旋回界面的性质为区域性角度不整合,中期基准面旋回界面性质包括局部不整合、沉积转换面和同沉积侵蚀面.沉积转换面的识别对中期基准面旋回界面的识别起重要作用.

CHARACTERISTICS OF JURASSIC SEQUENCE STRATIGRAPHY IN THE MIDDLE AREA OF JUNGGAR BASIN

With the application of the theory of high-resolution sequence stratigraphy referred to the base-level, and drilling data and seismic and logging data, we identify the sequence interfaces within the Jurassic in the middle area of Junggar basin. Seven sequence boundaries are identified corresponding to one long-term base-level cycle and six mid-term base-level cycles. The boundary of long-term base-level cycle is a regional unconformity surface, however, the boundaries of mid-term base-level cycles are local unconformities, sedimentary transformation surfaces or sedimentary erosional surfaces. The identification of the sedimentary transformation surfaces is important to the identification of the boundaries of mid-term base-level cycles.