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系统分析了贝尔凹陷断裂构造特征,研究了断裂的形成演化对油气成藏条件的控制作用。贝尔凹陷自下而上划分为断陷构造层、断-坳转化构造层和凹陷构造层。根据断裂与构造层关系及断裂运动学特征,将贝尔凹陷发育的断层划分为上部断层系、下部断层系和长期发育的断层系断裂3种类型。各个历史演化时期控制着不同成因的断裂发育,贝尔凹陷早期铜钵庙组～大磨拐河组时期的伸展变形控制断陷盆地的发生、发展、消亡的演化过程,伊敏组时期的走滑变形主要形成一系列断裂密集带,同时形成大量次级盖层断层,青元岗组时期的反转构造变形形成了断层型构造反转和局部的背斜型构造反转。断裂的形成和演化影响主力烃源岩的分布和热演化程度,形成多种类型的圈闭,为油气运移提供良好的运移通道。发育长期活动断层的斜坡带和由长期继承性活动断裂与上部断层系构成的密集带是油气运聚成藏的有利指向区,控制着贝尔凹陷油气富集。
The tectonic features of faults in Beier sag are systematically analyzed, and the formation and evolution of faults controlling the hydrocarbon accumulation conditions are studied. The Bell Depression is divided into bottom-up tectonic fault layer, fault-depression conversion tectonic layer and depression structural layer. According to the relationship between fault and structural layer and fault kinematics, the faults developed in Beier Sag are divided into three types: the upper fault system, the lower fault system and the long-term fault system. Various historical evolution periods controlled the development of faults of different origins. The extensional deformation of the Early Tongbomiao Formation to Damoguaihe Formation in the Beier Depression controlled the evolution, evolution and disappearance of the rifted basin, the slippery during the Yimin Formation The deformation mainly formed a series of fault-intensive belts and a large number of secondary caprock faults formed at the same time. Reversal tectonic deformation during the Qingyuangang Formation formed fault-type structural inversion and local anticline inversion. The formation and evolution of faults affect the distribution and thermal evolution of main source rocks, forming various types of traps and providing good migration channels for hydrocarbon migration. The slope zone that develops long-term active faults and the intensive zone formed by long-term successional active faults and the upper fault system are favorable points for hydrocarbon migration and accumulation, controlling the enrichment of oil and gas in the Beier sag.