贵州盘县晚二叠世潮坪相沉积特征

通过对贵州盘县上二叠统钻井资料的研究分析,基于沉积岩石学、沉积学、古生物地史学及沉积地球化学等相标志识别出潮坪沉积以陆源碎屑沉积为主,可细分为砂坪、混合坪、泥坪、泥炭坪和潮沟等5种微相。分析认为:潮坪沉积发育海退型进积层序,沉积物粒度整体较细,分选性较好,发育潮汐层理;混合坪、泥坪、泥炭坪微相泥岩中V/(V+Ni)、Sr/Ba、U/Th、V/Cr、Ni/Co、Ceanom等地球化学参数指示了各微相沉积水体的缺氧-贫氧-氧化状态、贫氧-氧化状态和还原-贫氧-缺氧-氧化状态,与地质背景吻合性好。

Upper Permian Series Tidal Flat Facies Sedimentary Characteristics in Panxian,Guizhou

Through analysis of data from Upper Permian boreholes in Panxian, Guizhou has identified the tidal flat sediments are mainly terrigenous clastic sediments, on the bases of sedimentary petrological, sedimentological, paleontological and historic geological, as well as sedimentary geochemical indicators can be subdivided into five microfacies of sand flat, mixed flat, mud flat, peat flat and tidal creek. The analysis considered that tidal flat sediments have developed regressive type prograding sequence with sediment grain size finer as a whole, better sorted, developed tidal bedding. In mixed flat, mud flat and peat flat microfacies, mudstone geochemical parameters of V/（V＋Ni）、Sr/Ba、U/Th、V/Cr、Ni/Co、Ceanomindicated each microfacies sedimentary water body oxygen deficit-oxygen poor-oxidization state, oxygen poor-oxidization state and deoxidization-oxygen poor-oxygen deficit-oxidization state, thus tally with geological settings.