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Characteristics of Sequence-based Lithofacies and Paleogeography, and Prediction of Oolitic Shoal of the Feixianguan Formation in the Northeastern Sichuan
Author(s): 
Pages: 1-8
Year: Issue:  1
Journal: Acta Sedimentologica Sinica

Keyword:  川东北下三叠统飞仙关组层序地层岩相古地理鲕滩;
Abstract: 以沉积相和界面识别为依据,将川东北地区下三叠统飞仙关组划分为2个三级层序和6个体系域,在此基础上对飞仙关组层序地层学特征进行了分析,编制了各沉积体系域的层序-岩相古地理图和对鲕滩发育规律进行预测.结果表明:SQ1层序发育期,飞仙关组受持续海侵影响,形成以深水台盆为中心的台盆-台地边缘-开阔-局限-蒸发台地的相带展布格局,以海侵体系域的台地边缘和台内鲕滩最为发育,该体系域也是飞仙关组鲕滩相储层最发育的层位;SQ2层序发育期,受海平面大幅度下降和水循环受限及干旱炎热气候影响,区域沉积格局由开阔台地转化为局限台地,鲕滩逐渐消失,最终进入频繁暴露的蒸发台地环境,以沉积膏云岩为主,为飞仙关组天然气藏极其重要的第一套区域性致密盖层发育层位.
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