2012 31 (4):  721-729    ISSN: 1004-5589:  CN: 22-1111/P Geological features and oil-gas accumulation conditions of Zhangwu depression in new exploration area of southern Songliao Basin ZHAO Hong-Wei Exploration and Development Research Institute，Northeast Oil and Gas Branch，SinoPEC，Changchun 130062，China Received null  Revised null  Online 2012-12-25 Reference   Corresponding author: