Abstract：VSP is used to study seismic absorption and attenuation because of seismic wave acquired in wells. We consider that there are two kinds of formation: strong attenuation formations and weak attenuation formations according to the maximum amplitude variation of down primary wave with time in zero-offset VSP. The strongest attenuation formation is composed by multi constant Q layers, and the Q value in each layer can be extracted from VSP data. While the Q is infinite in weak attenuation formations, and seismic wave attenuation can be ignored. Based on the wave-extrapolation inverse Q filtering, the inverse Q filtering in strong attenuation formations is presented in this paper. Pilot tests show that this proposed approach is more stable and efficient than conventional inverse Q filtering which lead low accuracy due to difficulties in accurate Q value calculation. At the same time, this approach may provide meaningful insights for surface seismic inverse Q filtering.
