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Fault characteristic analysis for the hinterland of Junggar basin

LI Zhen hong, TANG Liang jie, DING Wen long, YAO Su ping (University of Petroleum, Beijing 102249, P. R. China)  
Faults in the hinterland of Junggar basin may be divided into deep fault system and shallow fault system. Deep fault system deve loped mainly from late Hercynian movement, incising Triassic system and below strata, formed the reversed fault and thrust structure; Shallow fault system developed mainly from early Yanshan movement, forming normal fault and graben and horst. On the planes faults have all kinds of style, N E and N W faults controlled main structural framework. On the cross section faults formed the overlaid composite structures which are dominated by the positive inverted structure. Faults in the hinterland are well campatable with the migration and accumulation of oil and gas. The pre exited deep faults link to act as the oil source faults, and the regional unconformity of Triassic system, acting as transition, connected the deep faults with the shallow faults, making the deep faults, and unconformity as the pathways through which oil and gas migrated to and accumulated in the structural traps controlled by the shallow fault system.
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