Abstract：Most strata compensation methods only consider the middle and the deep absorption rather than the strong lateral velocity and thickness variations at the near-surface,so the results are not satisfactory.To solve the problem,we propose a deterministic quantitative compensation method based on near-surface model to realize quantitative Q prediction and space-time variation compensation.Based on the principle of surface consistency,the conception of surface relative attenuation coefficient is introduced.A relative attenuation coefficient is calculated with statistics iterations in the common offset domain,and a near-surface relative Q is obtained.Then the near-surface relative Q is calibrated with the measured absolute Q and a near-surface Q model is built.Finally,a stable near-surface Q space-time variation compensation is realized.Model tests verify the high accuracy of the proposed method,and 3D seismic data applications in a few oil fields prove the validity of the proposed method.
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