【摘要】 依据黑龙江东部方正断陷新的三维地震资料,重新厘定了其主干断层——伊汉通断层(FZ3),发现该断层规模明显变大,对断陷的沉积-构造演化具有明显的控制作用。依据对伊汉通断层的新认识和FZ4、FZ5断层的发现,以及FZ6和FZ7断层的特征,确定方正断陷内部结构具有南北向(走向)分段、东西向(横向)分带的特点,并将方正断陷的沉积-构造演化划分成古近纪古新世—始新世的断陷期、始新世末的挤压隆起期、渐新世的差异沉降期和古近纪末期的挤压反转期4个阶段,指出东部凹陷埋藏深、面积大,是方正断陷新的油气勘探领域。更多还原

【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.更多还原