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对白碱滩油砂矿区油砂的分布、油源、储集砂体、油气运移通道等成矿因素进行分析。该区油砂主要分布于白垩系吐谷鲁组和侏罗系齐古组,且分布面广、含油率中等;含油层系主要是来自玛湖坳陷中二叠系风城组;齐古组、吐谷鲁组主要为河流三角洲沉积,该环境下形成的良好砂体为油气聚集提供了储集空间;断裂、不整合面作为油气运移通道,控制了油气的运移;并在此基础上建立了符合该地区的“披覆型”、“沥青封堵型”和“上倾尖灭型”3种成矿模式,对今后该地区油砂勘探具有一定的指导意义。
This paper analyzes the distribution of oil sands, oil source, reservoir sand body, hydrocarbon migration channel and other metallogenic factors in Baotan oil sands area. The oil sands in this area are mainly distributed in the Cretaceous Tugulu Formation and the Jurassic Qigu Formation, with wide distribution and medium oil content. The oil-bearing formations are mainly from the Middle Permian Fengcheng Formation in the Mahu Depression, In the Tugulu Formation, the delta mainly deposits in the river delta. The good sand body formed in this environment provides a reservoir space for the accumulation of oil and gas. The fault and unconformity surface act as hydrocarbon migration channels and control the migration of oil and gas. Based on the establishment of the “drape ”, “bitumen block ” and “upturned off type ” three kinds of metallogenic models, for the future of oil and gas exploration in the region have a certain Guiding significance.