Abstract: Based on the analysis of structural characteristics and evolution, anatomise of hydrocarbon reservoirs and analysis of falling drills, eight types of reservoirs are recognized, i.e., the layer anticlinal reservoir, the fault block reservoir, the fault-nose reservoir, the structural fault reservoir, the sand lens reservoir, the up-dip pinch-out sandstone reservoir, the lithologic-structural reservoir, the lithologic fault reservoir. The controlling factors of reservoir formation are concluded in seven respects, i.e., the oil source condition, the effective reservoir, the power of hydrocarbon migration, the migration pathway, the effective trap, the source-reservoir-cap assemblage, and the preserving condition at the late stage. Five patterns of reservoir formation are summarized, i.e., the multi-stage and multi-directional reservoir of structural uplift zone, the upper source rock and lower reservoir near oil sources and sags, the multi-source reservoir of discordogenic fault communication, the fault-screened reservoir-forming pattern of slope zone, and the reservoir of negative structure. According to the analysis, the key time for reservoir formation in the area is the end of sediments in Nenjiang and Mingshui Formations.

Key words: Songliao Basin, Zhaoyuan-Taipingchuan Area, Fuyu Oil Beds, reservoir type, the controlling factor of reservoir formation, the pattern of reservoir formation