聚合物溶液对岩石电阻率及岩电参数的影响

Influences of polymer solution on rock resistivity and various indexes

焦翠华，王军，刘兵开，王振宇，王延忠，辛治国，杨峰

摘要：砂岩油层经过聚合物驱替后，聚合物的吸附和滞留是否会导致岩石的导电特征发生变化，是否会引起岩电参数发生变化，将决定饱和度解释模型及参数的选取。通过对不同浓度、不同矿化度的聚合物溶液驱岩石电阻率的实验测量，研究了聚合物溶液对岩石电阻率及岩电参数的影响。得到如下结论：当聚合物溶液矿化度大于4 000 mg/L时，聚合物浓度对溶液电阻率、岩石电阻率及岩电参数的影响均很小，测井解释时可以不予考虑，研究成果为聚合物驱后饱和度解释奠定了基础。

Abstract: For sandstone reservoirs after polymer flooding, the selection of saturation interpretation models as well as their parameters depends on whether electric characters and parameters of the reservoirs change with the adsorption and retention of polymer. Based on experiment measurements of resistivity of reservoir rocks after flooded by polymer solutions of different concentration and salinity, we studied the influence of polymer flooding on rock resistivity and various indexes, and came to a conclusion that when the salinity is greater than 4 000mg/L, the polymer solution has a relative small impact upon the resistivity (only 5.8% as polymer concentration increases from 0 to 3 000 mg/L) and various indexes, and thus can be ignored during logging interpretation. The study laid down a sound foundation for a better interpretation of saturation after polymer flooding.

10.11743/ogg20110418