Abstract: The typical low-resistivity oil-gas layers reflected on well logs in Huoerguosi area in southern margin of Junggar basin resulted in difficult identification of oil/gas-bearing strata here. The drilling engineering conditions indicate that the low-resistivity property of the reservoir mainly resulted from the influence of drilling fluids. The rock resistivity with different salinities of drilling fluids saturated with 9 400 mg/L, 18 000 mg/L, 45 000 mg/L, 80 000 mg/L and 120 000 mg/L are measured, obtaining the corrective relationship between the rocks and the logs. By means of this relationship, the available well data are corrected in order to get real the reservoir resistivity and to well identify the oil and gas layers in this area.

Key words: Junggar basin, Huoerguosi area, low-resistivity reservoir, salinity, correction