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Study on Slope Breaks of the Late Cretaceous Depression Basin Around the Western Slope in the Southern Songliao Basin

DU Jiang-feng,LIU Zhao-jun,DONG Qing-shui,HE Yu-ping (College of Earth Sciences,Jilin University,Changchun130061,China)  
The study is carried out by a comprehensive analysis of the basement structure, palaeo-(geographic) location, occurrence and thickness of stratigraphy, structure development and of the well log and seismic data of the western slope of the southern sector of the Songliao basin in the late Cretaceous period. Three types of slope breaks developed during the depression period from the Qingshankou to Nenjiang Formations based on the present research: erodent, sedimentary and structural. It is evident these different types of slope breaks not only have restricted changes of compatible space filling in basin, but also have an important control on the sequence, development of sedimentary system and types of non-structural traps. Consequently it is obvious that the western slope of the Southern sector of the Songliao basin is a favorable area for non-structural traps and subtle reservoir exploration. The theory of slope breaks is also important in directing the further exploration and reserves prediction.
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