Abstract:Zeta Oilfield in the deep sea of West Africa has been developed for more than 10 years,and water displacement has been adopted for oil production for some time.However remaining-oil enrichment zones cannot be determined due to unclear directions of water flooding in injection-production well patterns and uneven displacement for different layers.To solve the problem,we carry out a research on the main oil bed,Layer 1#,and predict remaining-oil enrichment zones based on time-lapse seismic data.The adjacent-trace correlation coefficient on the time-lapse seismic data is optimized as a sensitive attribute for remaining oil prediction.Both the dynamic change of water flooding displacement and the water flooding frontier are clearly delineated on time-lapse seismic data.With the integration of geological structures,sand-body distribution,and adjacent-trace correlation coefficient,remaining oil enrichment zones are successfully predicted.And the following understandings are obtained:A.The impedance of oil-or water-content unconsolidated sand reservoirs is smaller than that of overlying deep-sea mudstone; B.The differences of time-lapse seismic data can basically indicate the range and direction of oil-water displacement,in which the correlation coefficient is more sensitive than others,it can better describe the edge position of oil-water displacement in the period of monitor survey acquisition; C.Based on the comprehensive analysis of oilfield structures,sand-body distribution,and correlation coefficient,three remaining oil zones of Layer 1# in 2013 are predicted,among which Zone Ⅲ and the southern part to Well Ⅰ-2 in Zone Ⅱ might be residual oil permanent retention zones.They need to be confirmed by further drilling.
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