Fault characteristics and its relationship with differential hydrocarbon accumulation of Zhangjiakou-Penglai Fault in Bohai region
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TE111.2

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    Abstract:

    Based on detailed interpretations of 3D high-resolution seismic data,the geometry and dynamics characteristics of the Zhangjiakou-Penglai Fault(Shabei strike-slip belt for short)was analyzed systematically. The differences of structural characteristics in different zones of the Shabei strike-slip belt were pointed out and their control on hydrocarbon accumulation was revealed combined with drilling data. According to the differences in structural characteristics,this strike-slip fault zone can be divided into three sections from west to east. The western section of the fault is an arc-shaped compressive-shear sinistral strike slip fault which distributes from NE-wards to NW-wards and gradually converges at an arc in right-handed stepped form shaped like a“broom”. The middle section is a conjugate strike-slip system trending left-handed NW and right-handed NE because of the limit of two uplifts in the south and the north. The main faults in the eastern section are NE-trending right-handed tenso-shear faults which are influenced by the Tanlu fault in an open distortional space.The strike slip faults in this area are characterized by negative flower structure or“Y”shape structure,showing that there were two phases of tectonic evolution in this region-extension in Eogene and strike-slip in Neocene. Shabei strike-slip zone is basically fixed after three phases of tectonic movements including Indo-Chinese,Yanshanian and Himalayan. Being controlled by distortion space and regional large-scale strike-slip faults,the general setting of Shabei strike-slip zone is shown in compression and gradually converting to extension from west to east. The different properties of each segment of Shabei strike-slip fault not only control fault traps development at different positions of the fault zone and sedimentary facies distribution in Paleogene,but also oil and gas migration efficiency,thus controlling differences in oil and gas accumulation. On the whole,petroleum geological conditions get better gradually from west to east,and the hydrocarbon enrichment in the eastern and the middle section is significantly higher than that in the western section of the Zhangjiakou-Penglai Fault.

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Li Xinqi, Li Huiyong, Yu Haibo, Jiang Tao, Xu Peng. Fault characteristics and its relationship with differential hydrocarbon accumulation of Zhangjiakou-Penglai Fault in Bohai region[J]. Petroleum Geology and Recovery Efficiency,2016,23(5):16~22

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  • Received:
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  • Online: October 11,2016
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