Identification of Oil Reservoir Meeting Atypical Archie Phenomenon

According to core data, this paper studies variation of resistivity in different pore structures and wettability conditions. The results show that with the increase of pore structure index m, the resistivity will increase significantly when the saturation is constant. Similarly, with increasing saturation index n, the resistivity will also increase even with the same saturation. With fixed m and n, the calculated formation water saturation will be very high, resulting in hydro- carbon reservoir being ignored. This variation characteristic is significant for the identification of hidden reservoir with atypical Archie formula.