Abstract:To build a good surface velocity model,we present a method using micro-log tomography combined with azimuth-weighted interpolation.The velocity at each observation point is calculated using tomography of micro-log travel time,and the depth-velocity relation is normalized through depth transformation constrained using horizons.The weight coefficients at main azimuths are inverted using a radial basis function and azimuthal basis function,followed by weighted velocity interpolation.After inverse depth transformation,we obtain the final near-surface velocity model.Two case studies,i.e.shooting depth design in Miquan and detailed near-surface velocity modeling in Chuanguanzhuang,show that micro-log tomography and azimuth-weighted interpolation yield good results with higher resolution than those derived from conventional well log interpretation and Kriging interpolation.
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JIN Changkun, WANG Yanguang, SHANG Xinmin, CUI Qinghui, Wang Dongkai. Near-surface velocity modeling based on micro-log and azimuth-weighted interpolation. Oil Geophysical Prospecting, 2020, 55(2): 257-265.
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