P098 Far-Field Radiation in Poroelastic Media from a Point Source in a Fluid-Filled Borehole S.R. Ziatdinov* (St.-Petersburg State University) A.V. Bakulin (Shell International Exploration and Production Inc) B.M. Kashtan (St.- Petersburg State University) & V.N. Troyan (St.-Petersburg State University) SUMMARY Cross-well seismic with direct reflected and tube waves is often used for imaging and monitoring of oil and gas reservoirs. Even though downhole sources are usually located in the borehole fluid at low frequencies their radiation is modified by the presence of poroelastic formations surrounding the well. Permeable formations also enhance the conversion of borehole tube waves into body or


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