塔河油田晚白垩世轮藻化石组合特征及意义

摘要

继塔河油田上白垩统南部(沙50井)发现晚白垩世轮藻化石组合后,在北部于奇1井下再次发现晚白垩世轮藻化石组合.通过对组合研究、井震对比,建立了白垩系层序地层.对塔河油田中、新生界沉积演化及油气勘探有重要意义.%Because upper Cretaceous of information is less, it is controversial that is existence. Recent years, we find again late Cretaceous charophyte fossil assemblage at Yuqi eare of north oilfield borehole (YQ1). which is first found at south of oilfield (S50). Through researching charophyte fossil assemblage, the earthquakes in contrasting, established stratigraphic sequence of Cretaceous. It is important significance that Mesozoic and Cenozoic boundary is deposition evolutionary and exploratory oil and gas in Tahe oilfield.