【摘要】 通过基准面旋回结构、叠加样式的沉积动力学分析,结合地表露头、钻井岩芯、测井资料的综合研究,运用高分辨率层序地层学理论和技术方法将米仓山-大巴山前陆盆地中侏罗统下沙溪庙组划分为1个长期、2个中期和10余个短期旋回层序;较为详细地讨论了短期、中期和长期旋回层序的结构类型、沉积序列和叠加样式;建立以长期旋回层序界面和最大洪泛面为等时地层格架,以中期旋回层序为等时地层单元的层序地层格架,以及地层格架中生储盖组合特征,认为下沙溪庙组下部具备良好的油气储、盖组合和形成大、中型次生油气藏的条件。更多还原

【Abstract】 Based on the dynamic analysis of base-level cycle and stacking pattern,combined with the data of outcrops,cores and logging,an one long-term, two middle-term and about ten short-term cyclic sequences from Lower Shaximiao Formation of Middle Jurassic in the foreland basin of Micang-Daba Mountain were classified.The structure types, sedimentary cycles and stacking patterns of short-term,middle-term,long-term cyclic sequences were discussed in detail.A chrono-stratigraghic framework, containing the source rock-reservoir-cap assemblage was established in reference to the long-term and middle term cycle squences.The study showed that Shaximiao Formation was a favourable reservoir-cap rock assemblage and was of the condition and possibilities of forming mid-size oil and gas reservoirs.更多还原