Crude shale oil produced by underground retorting of Green River Formation oil shale was hydrogasified over a cobalt-molybdate-on- alumina catalyst at operating temperatures ranging from 800 deg to 1,300 deg f, pressures of 500, 1,000, and 1,500 psig, and a liquid hourly space velocity of 1.02 Volumes of oil per volume of catalyst per hour (vo/vc/hr). At a temperature of 1,300 deg f and pressure of 1,500 psig, 94 weight-percent of the liquid feed was converted to gas containing 72 volume-percent methane. With two reactors in series at a temperature of 1,170 deg f in reactor 1 and 1,260 deg f in reactor 2 and a pressure of 1,500 psig, 97 weight-percent of the liquid feed was converted to gas with a methane content of 75 volume- percent. Liquefied petroleum gas (lpg) was hydrogasified at operating temperatures ranging from 500 deg to 1,400 deg f at a pressure of 500 psig over a cobalt-molybdate-on-alumina catalyst. Similar experiments were made with an empty tubular reactor. The data indicate that gasification reactions in the presence of a cobalt-molybdate catalyst change from predominantly a catalytic (carbonium ion) reaction to predominantly a thermal (free radical) reaction at temperatures greater than 1,100 deg f. The data also indicate that a reaction temperature of 1,350 deg f is necessary at the space velocities used in this investigation to make a synthetic natural gas (methane content of 90 volume-percent) from in situ crude shale oil. Work done in cooperation with the University of Wyoming.