Abstract: The Cretaceous low resistivity reservoir in Junggar basin is characterized by high porosity, high permeability, low salinity of formation water, low formation pressure and low resistivity. Based upon the analysis of log curves and the simulated log responses of formation, it was demonstrated that the filtrate invasion to Cretaceous low resistivity reservoir mainly occurred during the very beginning of the penetration of the permeable formation. Logging immediately made after drilling has not much improvement to the identification of pay zone. It was verified that induction logging is superior to lateral logging by comparing those two measurements in various wells. Three kinds of logging suites are successfully carried into execution in the exploration and development of the Cretaceous low resestivity reservoir in Junggar basin.

Key words: low resistitvity reservoir, mud filtrate invasion, induction logging, laterolog, hydrocarbon identification, Junggar basin