辽河盆地新生代断裂与油气关系

辽河盆地是一个以新生代为主要成盆期的裂谷盆地,断裂和断陷活动是新生代构造变形的主导方式.断裂幕式活动,引起沉积空间和湖盆范围周期性扩张与收缩,控制了生储盖及其组合特征.断裂的发育对油气富集有着十分重要的影响,它控制了油气运移和聚集.该文较全面和系统地总结了断裂对油气的影响,认为主干断裂控制油气富集,断裂发育演化对油气资源有重要的影响.次级断裂对油气的侧向封堵及油气的再分配有重要的作用,断层的开启性又导致不同区块油气贫富不一致.断裂控制了特殊储层裂缝发育,对圈闭形成起到了关键的作用.因此,正确认识断裂对勘探具有十分重要的意义. 

RELATIONSHIP BETWEEN THE CENOZOIC FAULTS AND HYDROCARBON IN THE LIAOHE BASIN

The Liaohe Basin is a rift basin with the main basin-forming period in the Cenozoic. Faulting and rifting were the dominant styles for the Cenozoic tectonic deformation. Episodic faulting resulted in the periodic extension and cont raction of sedimentary spaces and lakebasin scopes,and cont rolled source rocks,reservoirs andcap rocks as well as their assemblage characteristics. The development of faults played an important role in theenrichment of hydrocarbon,and cont rolled the migration and accumulation of hydrocarbon. In this paper,theinfluence of faults on hydrocarbon was summarized thoroughly and systematically. It was considered that majorfaults cont rolled the enrichment of hydrcarbon,and the development and evolution of faults had an important enfluence on hydrocarbon resources. Secondary fault stook an important part in the lateral plugging and redist ribution of hydrocarbon,and the opening property of fault s resulted in poor or rich hydrocarbon in different districts. Faults cont rolled the development of special reservoir f ractures,and played a critical role in the formationof traps. Therefore,correct understanding of faults will have very important significance to hydrocarbon exploration.