塔里木盆地海相碳酸盐岩与油气

塔里木盆地碳酸盐岩主要分布于台盆区寒武系—奥陶系,它既可以作为油气的储层和源岩,也可以作为油气的盖层或遮挡体。碳酸盐岩主要发育于碳酸盐岩台地相和斜坡相之中,其中开阔台地及台地边缘坡折带的生物碎屑滩和砂屑滩、局限台地的白云岩坪是主要的储集相带。潜山溶孔溶洞型白云岩、石灰岩及礁滩复合体中的生物碎屑灰岩、砂屑灰岩、鲕粒灰岩、礁灰岩以及潮坪白云岩是主要的储集岩。寒武系—下奥陶统、中—上奥陶统都发育有较好的碳酸盐岩烃源岩。根据油气的分布与聚集特点,对碳酸盐岩油气藏作了分类。论述了塔里木盆地碳酸盐岩油气勘探的前景和重要目标。

Marine Carbonate Rocks and Hydrocarbon in Tarim Basin

Carbonate rocks are not only hydrocarbon reservoirs and source rocks but also cap rocks or barrier beds from hydrocarbon in Tarim Basin. Cambrian-Ordovician carbonate rocks develop in platformal and slop facies regions, in which reservoir facies belts are commonly bioclastic bank and sand bank in open platform and slop beak zone along platform margin as well as dolomite rock flats. Good carbonate source rocks develop in Cambrian-Lower Ordovician and Middle-Upper Ordovician formations. Based on the features of hydrocarbon distribution and accumulation, the author discusses geology characteristics, formation environments of the carbonate rocks, classification of carbonate hydrocarbon reservoirs and the oil and gas exploration prospects and significant aims in the basin.