基于TDS技术确定油藏平面渗透率各向异性

Anisotropy of areal reservoir permeability estimated by TDS technique

为了准确确定油藏平面各向异性,避免烦琐的压力图版拟合,提出了基于Tiab直接计算(TDS)技术确定最大、最小方向渗透率及其方位角以及平均平面渗透率和渗透率各向异性度的方法。首先作出平面各向异性油藏干扰试井压力和压力导数双对数曲线,根据曲线交点处的压力和压力导数以及无因次时间,求得激动井观察井的方向渗透率,然后把该方向渗透率代入观察井的各向异性渗透率定量计算模型求解即可。该方法所得结果与现场试验分析测得结果吻合较好。

To determine areal anisotropy in hydrocarbon reservoirs without tiring type-curve matching, a new method based on TDS （Tiab＇s direct＇ synthesis） technique was presented to estimate the maximum and minimum directional permeability and its azimuth angle, average areal permeability as well as anisotropy degree. Firstly, the interference test pressure and pressure derivative curves of areal anisotropic reservoir were drawn. Then, the directional permeability between activation well and observation well was estimated by pressure and pressure derivative as well as dimensionless time at intersection point. Finally, the estimated directional permeability was incorporated into the quantitative calculation model of anisotropic permeability of the observation well, and the model can be solved. The results agree well with the results of field test.