鄂尔多斯盆地甘谷驿油田低渗透砂岩沉积微相特征及对产量的控制

Characteristics of low permeability sandstone reservoir and their control on oil distribution and production in the Ganguyi oilfield of Ordos Basin

鄂尔多斯盆地上三叠统长6油层是盆地的主力油层。以盆地东部的甘谷驿油田为例,分析了该油层的沉积微相特征、产量分布特征及其相互关系,认为储层的沉积微相控制油井的产量;研究区(水下)分流河道砂体渗透性好,油井产量高;高产油井在平面上呈条带状分布,与储层的沉积微相展布、渗透率平面展布基本一致。

This paper is based on an example from the Ganguyi oilfield in the Ordos Basin.Chang 6 oil layer is the main oil-bearing formation of this field.Through analysing the features and relationships of the physical properties,sedimentary properties,lithofacies properties,and the production of different settings of Chang 6 oil layer,it can be concluded that the lithofacies of reservoirs control on the well production.With high permeability,the well in the underwater distributary river channel has high production,but the well in the overflow sandbank with low permeability has low production.The wells with high production are distributed in the strip of the plane in the same way as the distribution of lithofacies and permeability.This research provides a geological basis for the next adjustment of this oilfield development scheme and for similar reservoirs in the Ordos Basin.