Abstract: In view of the complex lithology of volcanic rocks, the identification and evaluation on gas and water layers in deep zone in northern Songliao Basin, Daqing Oilfield Co. Ltd. enlarges the development and application of compound log data and develops new method for the identification and evaluation on gas and water layers of deep zone through the establishment of evaluation chart for the quick judgment on physical properties of reservoirs, the parameter evaluation of reservoir and the establishment of evaluation on gas and water zone layers , which has obtained remarkable achievements in practical application. Accurate evaluation is timely provided for the high-production gas wells, such as Xushen-1 well, Weishen-5 well, Xushen-6 well and Xushen-601 well, etc. It is favorable for Daqing Oilfield to make new breakthrough in deep gas exploration and meets the demand of complex geological exploration.

Key words: identification and evaluation of natural gas, compound logging, underbalanced drilling, volcanic reservoir, the north of Songliao Basin