1. An apparatus for forming a tomographic image of relative presence and position of oil, gas and water phases of three phase flow over a cross-sectional area of a conduit, comprising: an array of a plurality of transmitters mounted about the periphery of the conduit and emitting energy to travel over transmission channels from individual ones of the transmitters through the three phase flow in the conduit; an array of a plurality of receivers mounted about the periphery of the conduit, each receiving energy after travel over the transmission channels from the individual ones of the plurality of transmitters through the three phase flow in the conduit; and a data processing system forming the tomographic image of the three phase flow in the conduit based on travel of the energy over the transmission channels from the individual ones of the plurality of transmitters to each of the plurality of receivers through the three phase flow in the conduit, comprising: (1) a processor forming measures of the speed of travel of the energy in the three phase flow over the transmission channels from the individual ones of the plurality of transmitters to each of the plurality of receivers; (2) the processor further forming measures of the attenuation of the energy in the three phase flow over the transmission channels from the individual ones of the plurality of transmitters to each of the plurality of receivers; (3) the processor further forming a synthesized composite image as the tomographic image of the relative presence and position of the oil, gas and water phases over the cross-sectional area of the conduit based on the formed measures of the speed of travel and attenuation of the energy in the three phase flow in the conduit between individual ones of the plurality of transmitters to each of the plurality of receivers; and (4) a display presenting the synthesized composite image as the tomographic image of the relative presence and position of the oil, gas and water phases over the cross-sectional area of the conduit for evaluation and analysis.