低渗油田吸水异常机理研究

本文低渗油田吸水异常现象定性分析可以看出由于主力油层和非主力油层在裂缝发育程度和含油饱和度方面存在的差异,形成了注采不匹配的矛盾。在定性分析的基础上选择地质剖面模型做数值模拟,进行定量研究,揭示低渗透油田注水开发吸水异常机理。结果得出,裂缝发育程度差异是主力油层不吸水的主要原因。同时,含油饱和度,未饱和层、启动压力梯度、封隔段(不连通段)、射开程度等对吸水异常产生了一定的影响,但其影响程度远小于裂缝(或高渗透条带)对吸水异常的影响。该项研究对油田注水开发起到了较好的指导作用。

The Mechanism Study of Injectivit Particular of Low Permeability Oil Field

The passage first makes a qualitative analysis to the abnormity hygroscope of the Yushulin oil field,and from the qualitative analysis,the major reservoir and the non-essential reservoir are different from the ontocline of the fracture and the oil saturation,this leads to the conflict of the injection imbalance.Make the numerical simulation on the base of qualitative analysis and choosing geologic cross section module.Make the quantitative test,open out the mechanism of the abnormity hygroscope.From the qualitative analysis and the quantitative test,the ontocline of the fracture is the major reason of the non-hygroscope of the major reservoir.At the same time,the oil saturation,the unsaturated layer,the breakout pressure gradient,the pack off sealing area(the unconnected area),the perforation penetration have some influence to the abnormity hygroscope,but the degree is lower than the fracture(or the high transmissibility path).The research is instructional to the infusion of oil field in some degree.