摘要
通过湘西地区的地层发育特点及构造演化过程的研究,揭示其沉积体系演化特征。湘西地区古生代沉积了寒武系—二叠系。其中,寒武系纽芬兰统发育浅海陆棚碎屑岩相,寒武系第二统下部发育浅海陆棚碎屑岩—碳酸盐岩混合相,寒武系第二统中部—奥陶系发育海相碳酸盐岩台地相,志留系发育前陆盆地碎屑岩—生物礁相,泥盆系发育滨岸砂岩相,二叠系发育海相碳酸盐—潮坪相。依据岩性、岩相组合将湘西地区古生界划分为:深水滞留盆地、浅海陆棚、开阔碳酸盐岩台地—斜坡、浊积扇、三角洲、生物礁、潟湖—潮坪、滨岸等多种沉积体系类型。每种沉积体系类型形成受控于盆地的构造运动。
Based on stratigraphic development peculiarity and tectonic evolution process in the western Hunan area,have revealed sedimentary system evolution features in the area.The Paleozoic strata have been deposited from Cambrian down through to Permian.In which,the Cambrian Newfoundland Series developed neritic shelf clastic rock facies;lower part of Cambrian Second Series mixed neritic shelf clastic rock-carbonate rock facies;middle part of the series to the Ordovician marine carbonate rock platform facies;Silurian foreland basin clastic rock-biohermal facies;Devonian perezone sandstone facies;Permian marine carbonate rock-tidal flat facies.According to lithologic and lithofacies assemblages can divided the Paleozoic in the area into multiple sedimentary system types including profundal stagnant basin,neritic shelf,open carbonate rock platform-clinothem,turbidite fan,delta,bioherm,lagoon-tidal flat and perezone.The formation of every sedimentary system type is controlled by basin tectonic movement.
作者
李斌
晋长昊
胡博文
罗群
Li Bin;Jin Changhao;Hu Bowen;Luo Qun(Shenhua Geological Exploration Co.L td.,Beijing 100022;China University of Petroleum(Beijing),Beijing 100049)
出处
《中国煤炭地质》
2018年第3期1-11,共11页
Coal Geology of China
基金
国家自然科学基金“云质岩致密油储层微米-纳米孔喉网络体系及其流体耦合流动机理与流动下限”(41372145)
关键词
湘西地区
古生代
沉积体系
页岩气
地层特征
western Hunan area
Paleozoic Era
sedimentary system
shale gas
stratigraphic features
