Abstract：Near-surface absorption attenuation can seriously reduce the resolution of seismic data. Using micro logging data to estimate the near-surface absorption structure, obtain quality factor Q value of surface layer medium, and then perform inverse Q filtering compensation can achieve high fidelity and high resolution proces- sing. This paper proposed an improved spectral ratio method for obtaining Q values from micro logging data of a single well and then fitted the relationship between surface layer velocity and Q values to convert the near-surface velocity field into a near-surface Q field. Because the surface layer of the Sichuan Basin is thin, the depth sampling interval of the near-surface velocity field by tomographic inversion is 10 meters, which makes it difficult to reflect the surface layer changes that are several meters. Therefore, combined with the multi-shot fitting algorithm for micro logging data of two wells, the equivalent Q value of the shallow surface layer was obtained. Then, the relative Q field of the surface layer was obtained using the amplitude and travel time information of the seismic data. In addition, the absolute Q value obtained from the micro logging data of two wellswas used to calibrate the relative Q field. Finally, the plane Q field of the surface layer was embedded in the shallow layer of the near-surface Q field converted according to the Q-V fitting relationship, and the optimized near-surface Q field of the work area was obtained and used for near-surface Q compensation of seismic data, so as to broaden the frequency band and improve the resolution of seismic data.
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