These data include composition of void gas, pressure core gas, and hydrate gas samples collected from the Terrebonne Basin in the Gulf of America (Gulf of Mexico) at Walker Ridge Site H, Holes H003 and H002. Cores were collected during drilling as part of the Deepwater Hydrate Coring Expedition (UT-GOM2-2) in August 2023. This U.S. Department of Energy funded project was focused on better understanding microbial methane generation in marine sediments and characterizing coarse-grained gas hydrate reservoirs. Sediments were recovered continuously down to 155 meters below the seafloor and as spot cored intervals down to 861 meters below the seafloor. Cores were recovered using both conventional and pressure cores. Gas samples were collected from both conventional and pressure cores in order to understand the source of gases in Terrebonne Basin sediments. Gas samples were analyzed for C1-C5 hydrocarbon, CO2, O2, N2, and δ13C-CH4 composition using gas chromatography and cavity ringdown spectroscopy.