IntroductionThe petroleum basin system in Northeast China is characterized by the Songliao Basin and its Mesozoic–Cenozoic peripheral small-to medium-sized basins. With escalating exploration challenges and operational costs in the mature Songliao Basin, strategic attention has shifted to evaluating hydrocarbon potential in these under-explored peripheral basins to address regional energy security and production sustainability.MethodsThis study investigates the eastern peripheral basins of Songl