温度与压力对注水地震监测的影响

Effects of temperature and pressure on seismic monitoring for waterflooding.

注水不仅会引起储层流体饱和度的变化，而且会导致储层温度和压力 的变化。本文分析了注水 对储层地震特性的影响，并通过正演模拟着重研究了地层压力与温度的变化对地震响应的影 响。模拟结果表明：流体替换是产生注水地震异常的关键。由于注水而引起的地层压力的增加将削弱流体替换的影响，而相应的温度降低却会增强流体替换的影响。当地层压力和温度 变化较大时，其对地震响应的影响是不可忽略的。

Waterflood can cause variation not only in reservoir fl uid saturation, b ut also in reservoir temperature and pressure. The paper analyzed the effects of waterflood on seismic characters in reservoir and gave emphasis to study of eff ects of variation in reservoir pressure and temperature on seismic response by f orward modeling. The modeling results show that fluid displacement is key to se ismic anomaly caused by waterflood. Increase in reservoir pressure will weaken the effect of fluid displacement but corresponding decrease in temperature will strengthen the effect of fluid displacement. Its effects on seismic response ca n not be neglected when variation in reservoir pressure and temperature is large r.