济阳坳陷石炭—二叠系沉积特征及岩相古地理演化

Sedimentary characteristics and lithofacies paleogeography evolution of Pero-carboniferous system in Jiyang depression

利用露头、钻井、地震和分析化验资料,依据沉积学基本原理和方法,对济阳坳陷石炭-二叠系沉积相及岩相古地理进行研究。结果表明:济阳坳陷石炭-二叠系沉积建造可以分为4种沉积体系和7类沉积相,即陆表海滨岸环境下台地-泻湖沉积体系、障壁岛-泻湖-潮坪复合沉积体系,海陆交互环境下的三角洲沉积体系以及陆相环境下的河流-湖泊复合沉积体系,发育泻湖、台地、潮坪、障壁岛、三角洲、河流和浅水湖泊等类型沉积相;受到华北板块周缘造山带影响,研究区古地理演化经历了由陆表海滨岸环境—海陆过渡相环境—陆相环境的转变。

By using sedimentology theories and outcrops, drilling, seismic and analytical and test data, sedimentary facies and lithofacies paleogeography of Peru-carboniferous system in Jiyang depression were studied. The results show that the sedimentary structure of the research area can be classified into four sedimentary systems including lagoon-platform sedimentary system, barrier land-lagoon-tidal flat sedimentary system, shallow delta sedimentary system, fluvial-lake sedimentary system and seven sedimentary facies including lagoon, plateau, barrier land, tidal flat, shallow delta, meandering river, shallow lake. Influenced by border orogenic belt of North China plate, the paleogeography evolved from epicontinental sea onshore environment, paralic environment to continental environment.