Geochemical Study on Hydrocarbon Gases in Seafloor Sediments, Southwestern Offshore Taiwan - Implications in the Potential Occurrence of Gas Hydrates

Seafloor sediment samples collected from southwestern offshore Tai-wan have been analyzed for hydrocarbon gases resident in samples by us-ing the technique of headspace gas analysis. The results reveal that the gas content is in tens to thousands ppm (vol. in wet sediments). Both microbial gas (usually called biogenic gas) dominated with methane and thermogenic gas containing C2 hydrocarbons were detected, inferring that the gases involved in the potential gas hydrate occurrence in the study area may have multiple origins. The microbial gas generated by methanogenic archaea in immature sediments is more widely distributed than thermogenic gas gen-erated in sediments of the catagenesis stage. The presence of thermogenic gas infers an effective petroleum system, which may favor the formation of gas hydrate as well as for oil and gas exploration.