江陵凹陷含盐层系层序地层与沉积特征

应用层序地层学原理建立江陵凹陷白垩系-下第三系地层等时格架。其中渔洋组、沙市组、新沟咀组构成盐湖层序（二级层序）．层序形成的主控因素是构造运动，主要的沉积体系为河流-三角洲、浅水湖泊、盐湖沉积。次级层序的演化与气候变化关系密切．表现为河流-三角洲的进退与盐湖的交替发育。储集体主要为高位域的三角洲砂体，分布在物源区前端．位于盆地边缘。在高位期的沉积背景下．次级低位域发育的低位三角洲、低位盐湖。二者呈相互消长关系。低位三角洲位于盐湖岸线附近的物源区前端，有可能分布在盆地中央。沿盐湖岸线可能找到新的勘探目标。

Salt-bearing Sequence Stratigraphy and Sedimentary Characteristics in Jiangling Sag

The isochronous framework of Cretaceous stratigraphy in Eogene stratigraphy was constructed in Jiangling Sag based on the principle of sequence stratigraphy,in which Yuyang Formation,Shashi Formation and Xingouzui Formation were composed of salt lake sequence(secondary sequence).The major controlling factors in the formation of the sequence were tactogenesis,while the major depositional system was river-delta,shallow-water lake and salt-lake deposite.The evolution of the secondary sequence was closely relat...