油气运移输导系统及其对成藏的控制

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

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。

 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 surface－fault 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 hairier． The migration system consisting of unconformity surface sand body－unconformity 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．