油气输导通道的内部结构和输导机制特征

Interior structure,transporting mechanism and characteristics of oil or gas transporting passage

根据油气输导通道内部结构,分析油气输导机制及特征.结果表明,断裂主要通过伴生裂缝、诱导裂缝和破裂带内构造岩孔隙输导油气,油气沿裂缝运移符合泵吸作用下的管道渗流原理,具有幕式快速运移的特征,是油气垂向运移的主要输导通道.不整合面主要通过底砾岩孔隙和半风化岩石的风化卸载裂缝系统输导油气,沿不整合面运移是油气侧向穿层运移的主要输导通道.砂体内部按颗粒大小及其分布特征可分为均质结构、正韵律结构、反韵律结构和杂乱结构.均质砂体无优势运移输导通道,正韵律砂体的优势运移输导通道位于砂体的底部,反韵律砂体的优势运移输导通道位于砂体的顶部,杂乱结构砂体的优势运移输导通道位于颗粒相对较大的砂岩处.沿砂体运移是油气侧向不穿层运移的主要输导通道.

Transporting passage fault is composed of crushed zone and induced fractures.It transports oil or gas through associated and induced fractures and porosity of tectonite.The migration of oil or gas through fractures is under the action of seismic pumping and accords with the principle of percolation flow through pipeline.Owing to fast and multinational times characteristics,it is the main transporting passage of oil or gas vertical migration.Unconformity transports oil or gas through porosity of basal conglomerates and weathering-off-load fractures,and it is the main transporting pathway of oil or gas lateral migration through strata.There are four types of homogeneity structure,positive rhythm structure,opposite rhythm structure and random structure in sandbody.The sandbody with homogeneity structure does not have main transporting passage.The main transporting passage of the sandbody with positive rhythm structure is on its bottom.The main transporting passage of sandbody with opposite rhythm structure is on its top.The main transporting pathway of sandbody with random structure is in sandstone in which its grain is bigger.Sandbody is the main transporting passage of oil or gas through strata.