STRUCTURAL SEGMENTATION OF THE EASTERN QIULITAGE STRUCTURAL BELT IN KUQA FORELAND BASIN,XINJIANG
JIN Wenzheng1,2, TANG Liangjie1,2, WANG Qinghua3, YU Yixin1,2, WAN Guimei1,2, YANG Wenjing3, PENG Gengxin3 and LEI Ganglin3(1.Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China; 2.MOE Key Laboratory for Hydrocarbon Accumulation Mechanism Research, China University of Petroleum, Beijing 102249, China; 3.Research Institute of Petroleum Exploration and Development of Tarim Oil Field, Korla, XJ 840000, China)
It was found from 5 typical seismic sections in the Qiulitage structural belt that the studied area can be divided by the DQ94-226 seismic line into 2 distinct parts with different structural types. In the west part passive roof recoil fault was developed above the salt layer, salt pillow and salt nappe were developed in the salt layer, and fault-related fold and thrust belt were developed below the salt layer. In the east part reverse fault thrusting southward was developed above the salt layer, salt nappe was developed in the salt layer, and fault-related fold and pop-up structure were developed below the salt layer. Analysis of the balanced section shows that the shortening amount is quite different between the west and the east, as the shortening amount for the west part is more than that for the east part. Analysis of the subsidence history shows that the tectonic movement becomes more and more intensive from east toward west, since the tectonic movement in the west appears to be more intensive than in the east. Therefore the eastern Qiulitage structural belt can be divided into two segments: Kuqatawu structural belt in the west and Dina structural belt in the east.