Abstract: EMI image logging technique is used for study of the sedimentary facies of Lower Wuerhe conglomerate reservoir in District No.8, Karamay oilfield, which deals with the loss and misplacement of some sedimentary information caused by the vertical discontinuity of core, short core, core break, leakage and misplacement as well as no direction of core. The characters of EMI image logging about lithology and sedimentary structure by comparison between the core data and EMI image logging data. The regressive sand wave crossbedding, which cannot be found in the core data, is identified in the studied area for the first time, based on which the features of the EMI image logging of microfacies of fluvial-dominated fan delta deposits in the target zone of District No.8 in Karamay oilfield are discussed. And the EMI image logging features of such microfacies as grain-flow deposit, channel deposit, natural levee deposit, interchannel deposit, mud-rock flow and debris flow are then presented in this paper. The grain-flow deposit is identified for the first time, which isn't found in the core data. Also, the application of EMI image logging data to the distribution and evolution of sedimentary facies and the source direction of the target zone is discussed.

Key words: Karamay oilfield, EMI image logging, sedimentary facies, fan, delta