塔里木盆地志留系油气成藏主控因素及勘探方向

塔里木盆地志留系主要发育四套储盖组合,油气藏类型主要有构造油气藏、地层遮挡油气藏、构造-岩性油气藏、砂岩上倾尖灭油气藏四种;油气成藏主控因素主要为构造演化、沉积储层及保存条件;综合构造、沉积演化及储层和已知油气藏分析认为塔里木志留系有三种潜在的油气藏类型:地层超覆岩性油气藏、不整合遮挡油气藏、沥青砂遮挡油气藏,并指出了下步有利勘探方向。

Key controlling factors analysis in hydrocarbon accumulation and prospecting areas in Silurian system of Tarim basin

Four units of reservoir-seal assemblage and four kinds of reservoir, including structural reservoir, stratigraphic barrier reservoir, stratigraphic-structural reservoir and sandstone updip pinch-out reservoir have been developed in the Silurian system of Tarim basin. Hydrocarbon accumulation has been mainly controlled by structural evolution, sedimentary reservoir and storage conditions. Based on analysis of reservoir-seal assemblage, structural evolution and hydrocarbon accumulation, three types of potential reservoir, such as stratigraphic onlap-lithologic reservoir, unconformity barrier reservoir and asphaltic sand barrier reservoir, have been found to be developed in Silurian system. At the same time, favorable prospecting areas in Silurian system have been pointed out.