【摘要】 通过对大量露头和岩心资料的分析,塔中孤立台地北缘上奥陶统良里塔格组识别出滩、障积礁、灰泥丘、藻席、潮下低能带五种沉积微相。并按照沉积能量由高到低的顺序,建立起高频沉积组合,它们分别是:滩—礁组合、滩—礁—丘组合、滩—丘组合、粒屑滩组合、滩—席组合、丘—席组合、藻席组合、低能带—藻席组合,进而在层序格架内分析了这八种高频沉积组合在时空上的演化规律。在此基础上,结合地震资料以及前人研究成果,将该区精细刻画为四种加积型镶边台地沉积模式:1)断控型窄陡镶边台地,以塔中261井区为代表;2)断控型宽陡镶边台地,以塔中62井区为代表;3)沉积型宽陡镶边台地,以塔中82井区为代表;4)沉积型宽缓镶边台地,以塔中45井区为代表。断控型的台地边缘能量相对较高,有利于礁滩体的发育,沉积型台地边缘能量相对较低,礁滩体欠发育。这四种模式的建立为该区下一步的储层预测和油气藏开发提供了有价值的参考。更多还原

【Abstract】 By analysing abundant crop and core data,Lianglitage Formation of Upper Ordovician in the northern margin of isolated platform has been identified five micro-faces which are bank,bafflereef,algae mat,subtidal low energy zone.According to the high-low order of depositional energy,it constructs high frequency sedimentary group(reef-bank,reef-band-mound,bank-mound,grainstone bank,bank-algae mat,mound-algae mat,algae mat,low energy zone-algae mat)and analyses this eight depositional group evolution rule under the sequence framework.On this basis,synthesizing seismic data and research result of predecessors,it is divided into four aggradating rimmed-shelf sedimentary models delicately:1)fault-controlling narrow and sharp rimmed platform,taking Tazhong 261 area for example;2)fault-controlling wide and sharp rimmed platform,taking Tazhong 621 area for example;3)depositing wide and sharp rimmed platform,taking Tazhong 82 area for example;4)depositing wide and gentle rimmed platform,taking Tazhong 452 area for example.Fault-controlling platform margin has high energy,which is beneficial for reef-beach complex growth.These established models provide a valuable reference for Lianglitage Formation’s exploration.更多还原