Detailed Reservoir Prediction Of Nantun Formation In The Wudong Slope In Hailaer Basin

The Wudong Slope is the Eastern Slope of Southern Wuerxun Sag in Hailaer Basin. It is one of the main exploration area of Wuerxun Depression. Nantun Formation is one of the main oil layer. Because of its characteristics such as intense fault activity and rapid changing of sedimentary facies, its reservoir distribution is very complicated. The precondition of identifying lithologic traps and understanding the role of reservoir in hydrocarbon distribution is detailed reservoir prediction. Based on the study of geological characteristics of reservoir, this thesis combined well logging data, 3D seismic data and geological data, applied seismic attribute information fusion and wave impedance inversion in prediction of reservoir distribution of Nantun Formation. With analysis of influence of reservoir sandbody on hydrocarbon distribution, this thesis lay the foundation for the exploration and development.This thesis applied multiple linear regression in multi-seismic attribute information fusion in seismic analysis. 5 attributes are optimized in sandstone thickness prediction of 4 oil layers of Nantun Formation. They are average reflection strength, average energy, RMS amplitude, total absolute amplitude and arc length. Prediction coincidence rate is well, show the correlation coefficient of 0.88.Based on the data condition of study area, spares spike wave impedance inversion is applied in reservoir prediction. By optimizing inversion parameters, this thesis launched detailed prediction of horizon and vertical distribution of Nantun Formation. Compared with thickness in well data together with the result of seismic attribute analysis, the inversion result has a high credibility.Detailed sandbody description was conducted in 4 key areas. In N1 Member, hydrocarbon distribution is controlled by the difference of sandbody of different periods. In N2 Member, hydrocarbon distribution is limited by the shape of fan delta, the vertical layout and the variety of sedimentary facies of sandbody of different periods also lead to the difference of hydrocarbon accumulation. For the sandbody in sag area, the pinch out part in higher position is favorable area of oil accumulation.