Abstract: In view of reservoir feature in difficult-to-produce area of L oil pool in Ya 'erxia oilfield, this paper analyzes the structural style,sedimentary character,formation testing and production test fects, based on which establishes standards for reservoir classification andnet pay thickness recognition, describes the reservoir heterogeneity, and quantitatively determines the porosity, permeability, initial oilsaturation, net pay thickness and reservoir sensitivity, by using conventional study method for sandstone reservoir and re-interpretation ofwell test data. The sound bases could be as a guide for effective development of this dfficult-to-produce area.

Key words: Ya'erxia oilfield, low-yield oil-gas field, reservoir, petrophysical parameter, heterogeneity