夹层分布对小层等效渗透率表征的影响

夹层是指小层内部非渗透层和特低渗透层。夹层在层内对流体流动起到不渗透夹层作用,直接影响小层的渗透率,从而会影响到油藏开发动态特征和产能计算;因此需要明确层内夹层分布对等效渗透率表征的影响。针对层内不连续平行分布夹层,首先通过物理实验研究明确了层内夹层分布对小层局部区域渗透率的影响;同时得到了计算层内均质储层和非均质储层小层等效渗透率的计算方法;然后通过建立与室内均质夹层物理实验模型类似的油藏数值模型,基于两者结果对比分析,得出采用油藏数值模拟方法研究夹层分布对等效渗透率的影响是满足精度要求的;最后通过数值模拟方法研究,得出了层内夹层分布位置、夹层个数与夹层分布方式对小层等效渗透率的影响规律。

The Impact of Distribution of Interlayer on Inner Layer Equivalent Permeability

Interlayers refers to non-porous layer and ultra-low permeable layer around one layer. Internal flow of fluid is blocked during the production of oil and gas development. Permeability of reservoir is inevitably affected. And development performance of oilfield and productivity calculation of wells would be also affected. So the impact of distribution of interlayer on inner layer equivalent permeability should be determined. This article mainly aimed at the parallel discrete interlayers. Calculation methods of intrastratal equivalent permeability of homogeneous and heterogeneous reservoir was obtained by applying physical experiment ways. Then homogeneous numerical reservoir models similar to physical experiment model of interlayer were built. The comparison between numerical values and experiment values has been made for proving the good agrecment of numerical simulation models. The influence rules of vertical position, density and combinations of the interlayers on intrastratal equivalent permeability were figured out by applying numerical reservoir simulation method.