Characteristics of valley-slope break zone in the western slope of Songliao Basin and its control over reservoir distribution

Through comprehensive study on well data and seismic profile,stratigraphic collection,sedimentary facies and palaeo geomorphology analysis,the valley-slope break zone was identified,and characteristics of the valley-slope break system and its control over reservoir distribution were emphatically analyzed.The results show that the two flexural slope breaks spread in NE direction in the western slope of Songliao Basin during the early Cretaceous period and the valley is vertical to the strike of slope break zone.The valley-slope break zone has specific control over sediment volume partitioning and facies differentiation during the change process of basal level,so it has close relation with reservoir distribution.The valley is the main transportation channels for drainage system and sediment,and the slope-break is the place of sediment unloading.So valley-slope break zone controls the sediment types and planar distribution.