New understanding of interior structures and sedimento-tectonic evolution of Fangzheng Fault-Depression in eastern Heilongjiang Province
Shao Zhaoyi1 Yang Jianguo2 Wang Hongwei2 Wu Genyao3 Zhao Hailing1
1 School of Earth Sciences and Natural Resources，China University of Geosciences（Beijing），Beijing 100083 2 Exploration and Development Research Institute of Daqing Oilfield Company Ltd.，Daqing 163712，Heilongjiang 3 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029
Abstract：Based on the recent 3D seismic data，it is represented that the Yihantong fault（FZ3）is a main interior fracture of the Fangzheng Fault-Depression，which shows an obvious constraints in the Paleogene sedimento-tectonic evolution of the fault-depression.In addition，two other interior fractures，namely，the FZ4 and FZ5 faults, are determined by the data.Combined with characteristics of the FZ6 and FZ7 faults，the new understanding of the interior framework of Fangzheng Fault-Depression can be summarized to be that it is zonated transversely with the Yihantong fault being a boundary，and divided into three segments longitudinally.The sedimento-tectonic evolution in the Paleogene，separated into four periods，namely，the faulting period(Paleocene-Eocene)，the compression and uplifting period(end of the Eocene)，the differential subsidence period(Oligocene)and the inversion period(end of the Paleogene)，is reconstructed，which indicates that the east belt of the fault-depression，characterized with deeper subsidence and better developed strata，should be a new and important field for the future oil-gas exploration.
Shao Zhaoyi,Yang Jianguo,Wang Hongwei et al. New understanding of interior structures and sedimento-tectonic evolution of Fangzheng Fault-Depression in eastern Heilongjiang Province[J]. JOPC, 2013, 15(3): 339-350.
