Generation and evolution of Tazhong low uplift

Based on analysis on structural sedimentary characters (including structural stress field, structural framework, sedimentary environments and sources, vocanic activities, thrusts and seismic reflection characters) of Tazhong region and the whole Tarim basin, it is considered that the Tazhong low uplift was generated by collision of southern Tarim Plate with southern Kunlun Plate at the end of early Ordovician which caused co existence of the passive margin basin in the northern part of Tarim Plate with the back arc foreland basin in the sorthern part. Tangguzibasi depression is a back arc foreland basin, and Tazhong low uplift is a foreland uplift, Tazhong No.1 fault is a thrust of Tazhong foreland uplift, faults to the south are accommodation faults or compensation faults. The thrust belts formed during this stage are pre existed fault belts for late Aerjing strike slip fault system. The authors of this paper also discussed structural sedimentary evolution characters of Tazhong foreland uplift. Tazhong No.1 fault was generated at early stage with large throw, and its northern part connected with the source depression. It is an important fault connecting with the source depression, and can also improve the quality of reservoir rocks. Buried hills along this fault should be important exploration areas. Its eastern part was more intensively deformed than the western part, therefore should be a better exploration area than western part. Intensive vocanic activities during early middle Ordovician might cause poor source rock development in the Tangguzibasi depression. Compensition faults were mainly developed during Silurian Devonian. Generally, Tangguzibasi depression was steadily uplifted after Carboniferous, therefore the special attention should be paid to in the exploration of this depression.