辫状河三角洲水下分流河道储层构型研究

摘要

The member 1 of Taizhou formation in Haian depression of Subei basin is typical of braided river delta deposits and the internal structure of the sandstone is not clear.Considering factors such as lithology,sedimentary characteristics,and extrac-ting the electric and physical property characteristic parameters from well logging data,the cross plots analysis was conducted, and both the qualitative and quantitative models of the architectural element were built.Three marks are divided in underwater distributary channel:combined underwater distributary channel,single underwater distributary channel and inner accretion laye-ring of underwater distributary channel,and two architectural elements are also divided:underwater distributary channel main body and channel side body.The architecture model of underwater distributary channel is established.%以苏北盆地海安凹陷泰一段为例，发育典型的辫状河三角洲沉积，砂体内部结构尚不明确。综合考虑岩性、沉积特征等因素，并从测井资料提取反映构型要素的电性、物性特征参数，进行特征值交会图分析，建立构型要素由定性到定量的识别模型。研究认为，可将水下分流河道厚砂体分成三种级次：水下分流河道复合砂体、单一水下分流河道砂体、河道砂体内部的增生体；两种构型要素：河道主体和河道侧缘，建立了辫状河三角洲水下分流河道内部构型模式。