Abstract: The type logs from west District No.1 in Karamay oilfield are classified as the normal logs and composite logs. The normal logs from most wells are poor in quality, so the porosity and permeability models developed by them are lower in interpretation accuracy. For this reason, this paper proposes that for wells without the composite logs, the normal logs can be inverted to composite logs by means of neural network method, by which the porosity and permeability models are developed on litholgy, thus satisfying the requirement of logging interpretation. On the basis of these, the reservoir quality evaluation the Lower Karamay formation in west District No.1 in Karamay oilfield is conducted.

Key words: normal log, composite log, porosity model, permeability model, reservoir evaluation