1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Key Laboratory for Mineralization��Exploration and Exploitation of Oil Shale and Paragenetic Energy Minerals�� Changchun 130061��China; 3. Exploration and Development ��esearch Institute��Northeast Oil �� Gas Branch��SINOPEC��Changchun 130062��China

Cretaceous Huoshiling Formation of the Shuanglong area in Lishu faulted depression of Songliao Basin developed two types of eruptive volcanos��including the central vent eruption and fissure eruption�� They dif- fer in terms of the development scale and hydrocarbon accumulation�� The central vent eruption has the characteris- tics of violent activity��long duration��extensive distribution scale of volcanic rocks��large thickness and the lithol- ogy progressively shift from the mafic to the neutral�� The fissure eruption has the characteristics of weak activity�� short duration��less distribution scale of volcanic rocks��thin thickness and the lithology is mainly neutral�� The central vent eruption volcano is adjacent to lake basin��forming the environment of volcanic- lacustrine deposit�� With the alternate deposition of volcanic rocks��conglomerate and deep and semi- deep lake mudstone��the Hu- oshiling Formation of central vent eruption area has good association pattern of source rocks��reservoirs and caps rock��and forms self- generation and self- bearing combination of source- reservoir- cap�� The fissure eruption volcano is far away from the lake basin and the distribution of volcanic rocks has no directly contact with the deep lacustrine facies mudstone��coupled with poor reservoir properties��the Huoshiling Formation of the fissure eruption volcano area has poor conditions of hydrocarbon accumulation�� According to the comprehensive analysis of the data of drill- ing��oil testing and earthquake��it could be considered that the central vent eruption volcano in the western studied area is the favorable exploration area of Huoshiling Formation��in which the source rocks are deep and semi- deep lake mudstones��reservoir including pyroclastic rock��conglomerate and volcanic rocks��the reservoir space are mainly fracture and pore��