Abstract: Songliao basin is a large-scale complex sedimentary basin of Mesozoic and Cenozoic with fault depressions and depressions. It features three structural evolution stages, showing fault depression at early stage, depression at middle stage, reversal structure at late one. Dongnan uplift is the Class-I tectonic unit in Songliao basin, in which there are lots of spreading structures and reversal structures. They play good control parts to the hydrocarbon accumulation and distribution here. But different stages of formation and different horizons of development for the spreading structures and reversal structures result in different control effects of them on hydrocarbon accumulation in it. The spreading structures mainly control the primary hydrocarbon reservoirs, while the reversal structures mainly control the secondary reservoirs in deep sag and the primary ones in slope area.

Key words: Songliao basin, Dongnan (southeast) uplift, spreading structure, reversal structure, hydrocarbon distribution