Abstract: Complex lithologicical reservoir is the key storage space for oil and gas in the development of oilfield, and the accurate identification of the oil and water layer is the crucial problem in the development of this kind of reservoir. This paper in Moliqing fault depression two segment reservoir is main research group the layer, through the study area exploration wells drilling core data analysis to determine the study area reservoir sandstone and conglomerate, containing gravel sandstone, mud (CA) sandstone and pebbly siltstone. To study area 24 wells 73 test oil, 56 wells 132 layer for data logging data migration, according to the data were established based on different lithology fluid qualitative classification identification chart, various lithologic oil and water layers in the final recognition accuracy reached 85%, fully meet the requirements of oilfield production.