塔中地区早古生代单源三位油气成藏体系

Tazhong Eopaleozoic Petroleum Accumulation System in Tarim Basin

以油气成藏体系先进理论为指导,对塔里木盆地塔中地区下古生界油气成藏条件进行了研究。发现塔中地区早古生代成藏体系的油气来源于塔中北坡的烃源岩,油气沿不整合面和志留系砂岩作侧向运移,再沿断裂向上运移,最后在适合油气聚集的场所成藏。结果表明,塔中早古生代成藏体系的烃源岩、输导体系和圈闭均为分离状,油气来源单一,为塔中早古生代单源三位成藏体系。

Petroleum accumulation system is a natural subsurface petroliferous system which includes all the essential elements, i. e. , source rock, pathway system and trap, to accumulate petroleum and their effective configuration. The oil and gas accumulation conditions are studied under the guidance of petroleum accumulation system. It is pointed out that the petroleum of the Tazhong Eopaleozoic petroleum accumulation system comes from the source rock of the north slope of Tazhong Low Rise. First, the hydrocarbon migrates horizontally along the unconformity and Silurian sandstone reservoir rock. Then it migrates vertically when meeting the active faults. At last, the petroleum is entrapped. The results indicate that the unique source rock, pathway system and trap of the Tazhong Eopaleozoic petroleum accumulation system are isolated. So it goes by the name of Tazhong Eopaleo zoic petroleum accumulation system of one source with three bodies.