莺琼盆地高温高压条件下岩电参数变化规律研究

A research on the change of rock electricity parameters under high temperature and pressure in Ying-Qiong basin

准确确定变温压条件下的a、m、b、n等岩电参数是提高含油气饱和度计算精度的关键。通过莺琼盆地30块岩心系列变温压电性实验,建立了该地区储层岩电参数m、n随温度及压力变化的温压岩电模型,对常温常压和地层温压条件下的含油气饱和度误差进行了分析,并用莺歌海盆地东方区最新的地层温压条件下的岩电实验结果对该模型进行了验证,结果表明地层温压条件下的实验结果比较合理地反映了该地区储层岩电参数随温度与压力的变化规律,说明了该模型的可靠性。

It is the key to improving the calcuation accuracy of hydrocarbon saturation to accurately de- termine rock electricity parameters such as a, m, b and n under variable temperature and pressure. By a series of electricity experiments on 30 core samples in Ying-Qiong basin under variable temperature and pressure, a rock electricity model was built for the basin, showing how the rock electricity parameters m and n change with temperature and pressure, and the discrepancy of hydrocarbon saturation between the atmospheric and reservoir temperature and pres sure was analyzed. Some latest results of core elec- tricity experiments under reservoir temperature and pressure in DF area of the basin were used to check the model, indicating that the experiment results un der reservoir temperature and pressure may more reasonably reflect the change of reservoir rock elec tricity parameters with temperature and pressure in this area, and that this model is quite reliabile.