EFFECT OF TEMPERATURE ON THE FORMATION RESISTIVITY FACTOR OF POROUS MEDIA.

In recent years, considerable effort has been directed toward accurate logging interpretation of shaly sands. The purpose of this study was to determine the effect of temperature on the formation resistivity factor and relate this to previous shaly sand studies. The problem was investigated by laboratory measurements on core samples at temperatures ranging from 72 degree F to 368 degree F and with brine resistivities from 5 ohm-cm to 20 ohm-cm. Experimental results indicated that temperature does affect the formation resistivity factor. An increase in temperature of 296 degree F caused increases in the formation factor from 55 to 106 percent. However, the cation exchange capacity associated with the clay was not changed. The change in formation resistivity factor with temperature may possibly be a function of pore constriction.