白驹凹陷泰州组一段沉积相展布特征

Distribution Characteristics of Sedimentary Facies in the First Member of Taizhou Formation in Baiju Sag

摘要: 白驹凹陷位于苏北盆地东台坳陷的东北部，可以划分为2段，自下而上分别为泰二段和泰一段，泰一段又分为泰一1小层、泰一2小层和泰一3小层。研究表明，在白驹凹陷泰一段时期，发育辫状河三角洲、曲流河三角洲、湖泊、共3种沉积相类型，其中以湖泊相、辫状河三角洲相、曲流河三角洲相为主。泰一段3小层主要发育辫状河三角洲、东南发育范围较小的滨浅湖相，泰一段2小层表现为西南西北方向为三角洲前缘相，整个东方向湖侵，发育湖相，泰一段1小层，湖退，发育曲流河三角洲前缘，西南发育的湖相。

Abstract: Baiju sag is located in the northeast of Dongtai depression in Subei basin. It can be divided into two sections, the second and the first member of Tai from bottom to top, and the first member of Tai is further divided into small layer of tai-1, small layer of tai-2 and small layer of layer Tai-3. The study shows that during the first member of Tai formation in Baiju sag, braided river delta, meandering river delta and lake were developed, among which lacustrine facies, braided river delta facies and meandering river delta facies were the main sedimentary facies. Braided river delta and shore shallow lacustrine facies in the southeast are mainly developed in sublayer 3 of member 1 of Tai 1. The 2 small layers in the first section of Tai show the leading delta facies in the southwest and northwest direction, and lacustrine facies in the whole east direction, while the 1 small layer in the first section of Tai shows the lacustrine facies in the front of mean-river delta and in the southwest.