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Relationship between Base-level Cycles and Sedimentary Features in 2nd Member of Nantun Formation,Su-31 Block of Haila′er Basin

ZHANG Zeng-zheng(Haila′er Petroleum Exploration and Development Administration of Daqing Oilfield Company Ltd.,Daqing 163000,China)  
Using high-resolution sequence,we identified the base level cycles with 46 ultra short term,8 short,4 medium and 2 long-term in the Member 2 of Nantun Formation,Su-31 block of Haila′er basin.We used the sedimentary dynamics to illustrate the depositional changes with all base-level cycles.The main micro-facies of target layer in the study area included the braided distributary channel,sheet sand,former delta mud,etc.The base-level cycles constrain the micro-facies.With rise of base level,sediments showed retrogradation features,in contrast,with drop of base level,sediments had progradation.The sand rarely developed near the conversion surface of base level rise to fall,whereas the sand relatively developed near the conversion surface of base level fall to rise.The high-resolution sequence composed of base-level cycles and deposition kinetics gave more information to identify fine sedimentary body for development of the complex rift basin.
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