用时间推移测井计算原始含水饱和度新方法研究

On A New Method for Calculating In-situ Water Saturation with Time-lapse Log.

由于泥浆侵入,井周储层参数发生动态变化,其中含水饱和度的变化随侵入时间的推移近似呈指数规律增加,随侵入深度近似呈指数规律衰减,为此首次构造了指数函数式饱和度侵入剖面,并在此基础上尝试利用体积模型建立了反映储层参数变化规律的动态测井响应方程,最后提出了一种利用时间推移电阻率测井求取地层原始含水饱和度的新方法。对一口井进行了分析处理,结果表明该方法可以提高解释精度,更为准确地求取地层的原始含水饱和度。

Because of invasion of mud filtrate, the reservoir parameters change dynamically, water saturation descends exponentially with distance away from borehole while ascends exponentially with time-lapse. Therefore, an exponential water saturation function is put forward, and a dynamic response model of well logging is established which reflects the changing mode of reservoir parameters around borehole. A case study shows that the new water saturation model can improve the interpretation precision and is a new method to get in-situ water saturation.