胜坨油田特高含水期储层岩石物理相研究

应用沉积岩石微相与成岩储集相叠加法对胜坨油田沙二段 14,2 3 小层进行了岩石物理相分类及储集层综合评价 ,并研究了储层孔隙网络非均质性、岩石物理相带对剩余油的控制作用。研究结果表明 ,14小层岩石物理相可划分为 6类 ;2 3 小层可划分为 5类。各类岩石物理相之间的储集性能有明显差别。对特高含水期不同岩石物理相带的剩余油分布的分析表明 ,14小层的第 4类和 2 3 小层的第 3类岩石物理相带的剩余油饱和度最高 ,说明在相同成因的储集层中 ,中等物性的岩石物理相带的非均质现象较严重 ,其剩余油较富集 ,因而在此相带布井采油 ,油井含水率比同期老井降低 13.1% ,这进一步说明用岩石物理相来预测特高含水期的剩余油分布是可行的。

Analysis on petrophysical facies of reservoir in Shengtuo oil field with a special high water cut

The micro sedimentary facies, diagenetic reservoir facies and the physical properties of the reservoirs in Shengtuo oilfield in the stage of the special high watercut were analyzed. The petrophysical facies of rocks were classified, and the reservoirs were evaluated synthetically using the plus method of micro sedimentary facies and diagenetic reservoir facies. The influences of the heterogeneity of the pore network and the areas of petrophysical facies on the remaining oil distribution were studied. The study results show that in some formations with the same origin in Shengtuo oilfield in the stage of high watercut, the present remaining oil is mainly concentrated in the petrophysical facies with the moderate properties and a high heterogeneity of pore network. The average water cut of the new oil wells distributed in those areas was lower than that of the old oil wells by 13.1%, which shows the possibility for predicting the remaining oil distribution by using reservoir petrophysical facies.