高分辨率层序地层在岩相古地理编图中的应用

THE APPLICATION OF HIGHRESOLUTION SEQUENCE STRATIGRAPHY TO LITHOFACIESPALEOGEOGRAPHY MAPPING

以高分辨率层序地层学理论为指导,以地层学、沉积学和岩相古地理学为基础,对塔巴庙地区山西组单井剖面进行了精细的高分辨率层序地层分析、对比,同时建立该区等时地层格架,选择中期基准面上升半旋回作为编图单元,系统编制了山西组各中周期的岩相古地理图,并就其平面展布特点进行了描述。以此方法所编制的岩相古地理图具有重要的理论和现实意义,主要表现为更具等时性、成因连续性和实用性,能更好地反映一个地区在统一地质作用场中的各种地质信息和综合效应,对于覆盖区相带展布及变化具更合理的预测性,对油气勘探有很好的指导作用。

Based on the highresolution sequence stratigraphy theory,strata,sedimentation and lithofacies paleogeography,the fine highresolution sequence stratigraphy division and comparison have been done,and the highresolution isochronic sequence stratigraphy framework has been built,and the half cycle of base level elevating of middleterm baselevel cycle as the mapping unit has been selected,and the lithofacies paleogeography map of middleterm baselevel cycle has been established and its characteristic has been described.The sequences based lithofaciespaleogeography map made in this way is marked by several advantages like synchroneity and succession of the sedimentation process and hence is far more practical for exploration purposes.Furthermore,it more precisely reconstructs the primary geologic process,reveals certain unknown facts and proves more informative.The Permian System in South China was eventually exemplified to elaborate the aforementioned mapping method.