Abstract：Regarding the complexity of lithology and difficulty in fluid identification in deep-water turbidite fans in Block G of Equatorial Guinea,this paper conducts an AVO ray-trace modeling from well logs firstly,which based on careful well-tie calibration and rational wavelet extracted.In oil-bearing sandstone,there is an AVO II abnormality.The amplitude of oil-bearing sandstone is weak in near-offset,and gets stranger with the distance increase.Based on this forward model,the near-trace multiples which seriously affect the middle-deep layer imaging and amplitude preserving are suppressed.The multiple suppression method first decomposes the initial gather data,then eliminates the multiples by using coherent fitting based on dip scanning,finally reconstructs the remaining signals.According to the intercept-gradient attributes of oil-bearing layer which extracted from CDP gather,this paper divides the angle range which used in forming the angular gather rationally,and judges the general distribution of interface abnormality.Both petrophysical analysis and AVO inversion show that the zones with VP/VS less than 2.0 and P-wave impedance less than 6.5×106(kg·m-2·s-1) are oil-bearing sandstones in target layer.In this area,there are two channels from east to west,with the branch channel advancing,lobe complex runs widely spread.With lateral connectivity,good thickness,high porosity and permeability,the reserves abundance is great.
