Division of differential tectonic evolution in Shengli shallow sea area of Jiyang Depression
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TE121.2

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    Abstract:

    The evolution characteristics of different zones in the shallow sea area are obviously different due to the effect of Tanlu strike-slip fault. Based on the offshore and onshore seismic data,the strike-slip characteristics and their effects on the faults in shallow sea area were analyzed. The structural styles of the area were concluded based on the physical simulation experiments,and the division pattern of differential tectonic evolution was established. The study results show that there are NW-trending faults,NNE-trending faults and NE-trending faults. The NW-trending faults developed during Cenozoic and remained active with characteristics of left-lateral shearing in Kainozoic. The NNE-trending faults are right-lateral shear faults,and the NE-trending faults are extensional normal faults. And the strike-slip effect of NNE fault is the strongest of the three. The strike-slip effect of NW-trending fault is stronger than that of NE-trending fault. There are four types of strike-slip fault in the study area which are the bending strike-slip fault,the superimposed strike-slip fault with pressure releasing,the superimposed strike-slip fault with pressure increasing and the extensional strike-slip fault at its end in cauda equine. Finally,the differential tectonic evolution of the shallow sea area started to appear in the depositional period of Es3,which is due to transformation of Tanlu fault from sinistral to dextral. Meanwhile,the shallow sea area was divided into three evolutionary zones. The Ⅰ-area is an inherited faulted depression which is controlled by NW-trending faults. The Ⅱ-area is a coherent faulted depression which is controlled by NW-trending and NE-trending faults. The Ⅲ area is a strike-slip faulted depression and it is controlled by NNE-trending faults.

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LU Shunan, WU Zhiping, CHENG Yanjun, LI Xu. Division of differential tectonic evolution in Shengli shallow sea area of Jiyang Depression[J]. Petroleum Geology and Recovery Efficiency,2018,25(4):61~66

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  • Online: June 04,2018
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