湿地扇扇中辫状水道沉积微相-岩石相划分方法

A new method for subdividing the sedimentary microfacies of braided river channel in the middle of humid fan

综合应用岩心、测井、分析化验等资料,对湿地扇扇中辫状水道粗碎屑沉积特征进行了详细研究,提出了沉积微相-岩石相的划分方法。根据不同岩石相的物性、电性及含油性特征,将扇中辫状水道微相细分为辫状水道砂砾岩相、辫状水道粗砂岩相和辫状水道细砂岩相。研究结果表明,沉积微相-岩石相对油水分布具有明显的控制作用,其中以辫状水道砂砾岩相单井日产油能力最高,辫状水道粗砂岩相次之,辫状水道细砂岩相最低,比较符合油田的开发实际。辫状水道粗砂岩相因物性最好,剩余油丰度高,可作为下一步挖潜的主要目标。

Based on the sedimentary characteristics of a humid fan, this paper presents a new method for subdividing the sedimentary microfacies-lithofacies of the braided river channel in the middle of a humid fan, through a synthetic analysis of single well facies and log facies. According to petrophysical, electrical properties and oil-bearing grade of different types of lithofacies, the braided river channel can be subdivided into three types of macrofacies-lithofacies, namely the braided river channel glutenite facies, braided river channel coarse sandstone facies and braided river channel fine sandstone facies. The further research shows that sedimentary microfacies-lithofacies has a significant effect on oil distribution and production in conglomerate reservoirs. This is a good coincidence with the performance of oil production. Through the above analysis, a profitable target can be reached and the distribution of residual oil can be forecasted. This is very meaningful to the further development of the conglomerate reservoir.