Identification on inner structures of fractured fault zones based on geological model: A case study on Well Fan 162 area in Dongying Sag
DU Kai1, LIN Chengyan1,2, MA Cunfei1,2, REN Lihua1,2, LIANG Shuyi3, ZHANG Zongxuan1
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Reservoir Geology Key Laboratory of Shandong Province, Qingdao, Shandong 266580, China; 3. Dongsheng Petroleum Development Group co. Ltd of Shengli Oilfield, Dongying, Shandong 257000, China
Abstract：A fractured fault zone includes a fault core and surrounding induced fractured zones.Studying its inner structure can help evaluate how underground fluid flows in it.Following the workflow of “from a geological model to seismic forward modeling to multi-attribute comprehensive identification”,we studied the fractured fault zone in Well Fan 162 area.The results show that: ① Both the fault core and the induced fractured zone have impacts on the seismic waveform of the original formation,and seismic data recorded with small trace spacing can better identify the inner structure.The core has responses within the seismic frequency band.The waveform of the induced fractured zone is affected easily by the core at low frequency,while at high frequency,the resolution is higher,and the interference effect is weak,so that the waveform of the induced fracture zone can be distinguished.② The amplitude of the fault core is weak,and the coherence is poor within the seismic frequency band.The amplitude of the fractured zone is weak,and the high-frequency coherence is poor.But the undisturbed formation is well coherent and strong in amplitude; ③ The core can be distinguished from the fractured zone by the difference between low-frequency and high-frequency coherence and instantaneous amplitude.The fractured fault zone can be identified by curvature and high-frequency coherence.
杜凯, 林承焰, 马存飞, 任丽华, 梁书义, 张宗轩. 地质模式约束的断层破碎带内部结构地震识别——以东营凹陷樊162井区为例[J]. 石油地球物理勘探, 2020, 55(3): 651-660.
DU Kai, LIN Chengyan, MA Cunfei, REN Lihua, LIANG Shuyi, ZHANG Zongxuan. Identification on inner structures of fractured fault zones based on geological model: A case study on Well Fan 162 area in Dongying Sag. Oil Geophysical Prospecting, 2020, 55(3): 651-660.
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