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Macroscopic Heterogeneity and Hydrocarbon of Nantun Formation in the Eastern Structural Belt of Tanan Depression

ZHANG Jun-long Exploration and Development Research Institute,Daqing Oil Field Ltd Co.,Daqing 163712,Heilongjiang,China  
Nearshore subaqueous fan deltas developed in the Nantun Formation within the eastern structural belt of Tanan depression and deltas developed locally.Complex fill patterns formed complicated lithological reservoirs.On the basis of lithology,petrophysics and oiliness,reservoir heterogeneity is classified.Combing with sandstone genesis,sandstone superimposed pattern,lateral distribution and permeability rhythmicity,reservoir macroscopic heterogeneity is analyzed according to interlayer,plane and intralayer.This result reveals that sequence cycle controls vertical lithology and petrophysics changes.Tuffaceous facies devastate reservoir and influence petroleum migration.Subaqueous channels and channel sandstone are preferential for hydrocarbon accumulation.Middle fan of subaqueous fan deltas accumulates most of petroleum.
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