Abstract: The characteristics of development and activity of fault in Bozhong Depression were analyzed.The control of fault on hydrocarbon reservoir was investigated.Four types of fault were developed in Bozhong Depression,including the early extensional faults,middle strike-slip extensional faults,late strike-slip faults and long-term active faults.There were three periods of fault activity in Bozhong Depression.In the Late Eocene period,there formed the extensional faults in NNE,NE and closely EW directions.In the sediment period of Dongying Formation,the right strike-slip extensional faults in NNE direction superposed the left strike-slip extensional faults in NW-NWW direction.During the period from the Late Pliocene to the Quaternary,a right strike-slip movement occurred in the faults of NNE direction under the influence of the strike-slip displacement in Tanlu fault zone.The formation and evolution of fault controlled generation,migration and accumulation of hydrocarbon.The slope zone and central salient with growing long-term active faults are the favorable areas of hydrocarbon migration and accumulation.

Key words: Bozhong Depression, fault structure, fault evolution, hydrocarbon accumulation, distribution of source rocks, oil-gas migration pathway

摘要： 系统分析了渤中坳陷断裂构造特征,研究了断裂的形成演化对油气成藏条件的控制作用。渤中坳陷发育4种类型的断裂,即早期伸展断裂、中期走滑伸展断裂、晚期走滑断裂和长期活动断裂。断裂活动主要有3期:①沙三段沉积时期主要形成NNE向、NE向、近EW向伸展断层;②东营组沉积时期叠加了NNE向右旋走滑伸展断层和NW—NWW向左旋走滑伸展断层;③明一段—第四系沉积时期,受郯庐断裂带走滑活动的影响,NNE向断裂再次发生右旋走滑活动。断裂的形成和演化影响烃源岩的分布和热演化程度,形成多种类型的圈闭,为油气垂向运移提供良好的运移通道。发育长期活动断裂的斜坡带和中央凸起附近是油气运聚成藏的有利区域。

关键词: 渤中坳陷, 断裂构造, 断裂演化, 油气聚集, 烃源岩分布, 油气运移通道