不同类型断—砂配置输导的油气特征及成藏控制作用

为研究断—砂配置在油气成藏中作用,在断裂带内部结构和输导、封闭油气特征研究的基础上,采用断—砂空间组合和实例分析方法,研究不同类型断—砂配置输导油气特征及成藏控制作用.结果表明:按照断裂和砂体位置关系可将断—砂配置分为砂体位于断裂上盘和砂体位于断裂下盘2种类型,砂体位于断裂上盘又可细分为砂体与水平面夹角大于0°、等于0°和小于0°共3种类型;油气运移方向不同,有利于油气输导的断—砂配置类型不同,当油气沿断裂垂向运移时,只有砂体位于断裂上盘,且砂体与水平面之间夹角大于0°的断—砂配置有利于油气从断裂向砂体中侧向分流输导运移.并且可在断裂附近的正向构造(断背斜、断块、断层遮挡圈闭)上形成油气藏;当油气沿砂体侧向运移时,顺向断裂与砂体的配置有利于油气从砂体向断裂中输导运移,而反向断裂与砂体的配置有利于油气聚集形成断背斜、断块和断层遮挡油气藏.

Transporting oil-gas characteristics with different fault-sandstone matching and its control of oil-gas accumulation

To study role of fault-sandstone matching to oil-gas accumulation based on internal structure of fault zone and its transporting,sealing oil-gas characteristics,transporting oil-gas characteristics of fault-sandstone matching and its controlling to oil-gas accumulation were studied by the method of studying space combination of fault-sandstone and analysis of actual example.The result indicates that faultsandstone matching can be divided into two type of sandstone on hanging wall of fault and sandstone on foot wall of fault according to space relation between fault and sandstone.Fault-sandstone matching of sandstone on hanging wall of fault can be divided into three types of intersection angle between sandstone and fault more than zero,equal to zero and less than zero.If oil-gas migration direction is different,the role of different fault-sandstone matching to oil-gas migration is different,when oil-gas migrates vertically though fault,fault-sandstone matching,whose sandstone is on hanging wall of fault and whose intersection angle between fault and sandstone is more than zero,is favorable for oil-gas to migrate from fault to sandstone.Oil-gas can accumulates on positive structure(fault-anticline,fault-block,fault-sealing traps) near the fault.When oil-gas migrates laterally through sandstone,matching between cisoid fault and sandstone is favorable for oil-gas to migrate from sandstone to the fault,matching between transoid fault and sandstone if favorable for oil-gas to accumulate and to form fault-anticline,fault-block and fault-sealing oil-gas reservoirs.