油气运移输导系统及其对成藏的控制

通过油气在地下岩石中运移输导系统类型的分析，指出孔隙、裂缝和孔隙-裂缝组合是油气运移输导系统的三种主要构成要素。据此提出连通砂体、断层和不整合面是油气在地下运移的简单输导系统，砂体-不整合面、砂体-断层、不整合面-断层、砂体-不整合面-断层为油气在地下运移的复合输导系统，它们为油气运移提供了立体网络通道。油气运移输导系统类型控制着油气的成藏模式。连通砂体输导系统可控制底层超覆、岩性尖灭、断层遮挡油气藏的形成；不整合面、砂体-不整合面、不整合面-断层组成的输导系统可控制基岩风化壳油气藏的形成；断层、砂体-断层、砂体-不整合面-断层组成的输导系统可控制断块、背斜、构造-岩性和断层-岩性油气藏的形成。

On Oil-Gas Migration Systems and Their Control over the Formation of Reservoir

Through the analysis of migration systems in subground rocks, this paper indicates that the oil-gas migration system is consisted of three main element, i.e. the pore, fracture and the pore-fracture combination. This paper puts forward the simple migration system consisting of connecting sand body, fault and unconformity surface, as well as the compound migration system consisting of sand body-unconformity surface, sand body-fault, unconformity surfacefault, or sand body-unconformity surface-fault, and both kinds of subground migration systems provide a three diamentional channel network for oil-gas migration. The type of oil-gas migration systems control the forming pattern of oil-gas reservoir. Connecting sand body migration systems may controls the forming of oil-gas reservoir due to bottom bed overlap. lithologic pinch out, and/or the fault barrier. The migration system consisting of unconfornfity surface, sand bodyunconformity surface, and/or unconformity surface-fault, may control the forming of the bedrock weathered crust type oil-gas reservoir. The migration system consists of fault, sand body-fault, and/or sand body-unconformity surface, may control formation of oil-gas reservoir due to fault block, anticline, structure-lithologic, and/or fault-lithology.