Paleo-karst and Distribution of Oil and Gas of Lower Ordovician in Akekule Area, Tarim Basin
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摘要: 下奥陶统碳酸盐岩是阿克库勒地区主要含油气层,岩溶作用是影响奥陶系储层发育的最主要因素。本文详细论述了该区下奥陶统发育多期岩溶,海西早期是主岩溶期,该期岩溶主要形成于表生大气淡水条件下,岩溶作用深度和范围受志留—泥盆系和上奥陶统隔水层限制。指出岩溶斜坡区的地表岩溶带及潜流岩溶带上部是有利的储层发育和油气主要富集区带。Abstract: The thick carbonate was deposited on the foreland of western Kunrin mountain in northwest margin of Tarim basin in Yigeziya Formation of the upper Cretaceous. The distribution of carbonate is from Kashi in the west to Keliyang of Yecheng county in the east. The bioclast limestone is one of the most important lithofacies of eight lithofacies. Oosparite and bioclast sparite are the main compositions of carbonate. The main sedimentary facies are carbonate plateform edge,open carbonate platform and limited carbonate platform. From the west to the east,the evolution of sedimentary environment is from carbonate plateform edge,open carbonate platform to limited car-bonate platform. From the west to the east, the thickness of Yigeziya Formation changes from 125 meters to 20 me-ters. Seven meter scale sychles were recognized in thick carbonate deposition. They are new sequence of oil and gas survey in Cretaceous in Tarim basin. The rich fossils of oyster mactra and spiral shell, carbonate plateform and reef shore show that the north-western Tarim basin was sea with the mouth open to the northwest,and the palaeocli-mate was warm, the palaeosalinity was salt to semisalt. The palaeosea graphic shape was long narrow band from Tajike in the west to Keliyang of Yecheng county in the east.
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Key words:
- Tarim /
- Cretaceous carbonate /
- depositional environment /
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