高矿化度钻井液侵入后储集层双侧向电阻率实验校正

为消除高矿化度钻井液侵入对双侧向电阻率的影响,通过岩电实验分析影响因素,改进电极系和测量工艺,使非渗透层岩样电阻率与双侧向电阻率一致。在高温高压条件下,用半渗透隔板气驱法测量岩电参数,再用高矿化度钻井液驱替模拟钻井液侵入。以此为基础,建立岩样电阻率与测井电阻率的对应关系,形成以实验为依据的电阻率测井校正方法。在准噶尔盆地腹部多口钻井的应用表明,应用校正后的电阻率计算的含气饱和度更为合理,为测井响应研究和储集层评价提供了有效手段。

Experimental Correction of Dual Lateral Reservoir Resistivity After High Salinity Drilling Fluid Invasion

In order to eliminate the influences of high salinity drilling fluid invasion on dual lateral resistivity, it is necessary to restore the real resistivity of formation. By analyzing the factors influencing rock electric experiment, the electrode system and measuring technology were improved to make the resistivity of the rock sample from impermeable layers consistent with the double lateral resistivity. Under the conditions of high temperature and high pressure, the rock electric parameters were measured with the semi-permeable baffle plate gas flooding method, and then the drilling fluid invasion was simulated by displacing the oil in rock samples with high salinity drilling fluid. Finally, the relationship between rock sample resistivity and logging resistivity was established and a correction method for logging resistivity based on experiment was formed. The application of the method in multiple wells in the hinterland of Junggar basin shows that the gas saturation calculated with the corrected resistivity is more reasonable. The method provides an effective means for logging response analysis and reservoir evaluation.