Quantitative characterization of syndepositional fault activity intensity with the sequence vector slip distance: An example in Panyu Low-uplift,Pearl River Mouth Basin
Liu Yong1, Du Xiaofang1, Hu Peng2,3, Li Xisheng4, Huo Shoudong5, Xu Hai6
1. Urumqi Branch, GRI, BGP Inc., CNPC, Urumqi, Xinjiang 830016, China; 2. Zhongneng Power-Technology Development Company Limited, Beijing 100034, China; 3. Laboratory of Marine Geology and Hydrology, Guodian New Energy Technology Research Institute, Beijing 102209, China; 4. Shenzhen Branch, CNOOC, Shenzhen, Guangdong 518054, China; 5. Key Laboratory of Petroleum Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 6. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100871, China
Abstract：Conventional 2D scalar methods cannot comprehensively characterize the activity intensity and space-time variability of fault systems.Therefore in order to study the activity intensity and temporal-spacial difference of syndepositional fault systems under weak torsional environment and its control on paleo-geomorphology,the concept and calculation method of the sequence vector slip distance (SVSD) are proposed in this paper.According to the high-frequency sequence interfaces,the spatial distribution and activity properties of fracture systems within the intramural tectonic activity are quantitatively calculated.In the lower part of Zhujiang Formation,Panyu Low-uplift,the Pearl River Mouth Basin,4 sets of syndepositional fault systems and six 4th sequence boundaries are identified based on 3D seismic data.Then the cumulative activity of each fracture system at each sequence interface (total vector slip distance) are calculated.At the same time,multiple cross-correlation algorithms are used to spatially locate the breakpoints of different fracture systems at each sequence interface.With subtraction difference in space,the SVSD increment of the boundaries is obtained,that is the activity increment of the fracture systems in the single-sequence development period.Finally quantitative characterization of syndepositional fault activity intensity in different periods is achieved.The results show that the activity intensity of the fault systems in study area has a strong-weak-strong trend,and the paleo-geomorphology controlled by four groups of the fault systems gradually changed from the early north high south low to the late northeast high southwest low.The proposed approach can effectively quantify the activity of "tension or weak torsion" fracture systems.
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Liu Yong, Du Xiaofang, Hu Peng, Li Xisheng, Huo Shoudong, Xu Hai. Quantitative characterization of syndepositional fault activity intensity with the sequence vector slip distance: An example in Panyu Low-uplift,Pearl River Mouth Basin. Oil Geophysical Prospecting, 2018, 53(6): 1256-1262.
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