Effect of Downhole Source Signature on Cross-Well Seismic Data Joseph G. Gallagher, Phillips Petroleum Seismic cross-hole tomography is emerging Current Issues in Acoustic Tomography as an important tool in production geophysics. T. W. Lo, Texaco Inc. describe or monitor reservoirs, the technique Well Effects in Cross-Hole Seismic Data is still in its early stages of R. Gerhard Pratt, University of Toronto preprocessing and imaging techniques are Toward a Complete Inversion: The Gypsy some of the issues that will be addressed. Project Emphasis will be given on combined techniques Walter Turpening, BP Exploration that would leverage the use of cross-hole seismic data for estimating interwell petrophysical parameters.