南海北部神狐海域天然气水合物气源混合类型及定量表征

我国南海具有丰富的天然气水合物资源,水合物远景资源量约650亿t油当量."天然气水合物含油气系统"研究是一项十分重要的基础性工作,其中气源是天然气水合物含油气系统最基础的要素之一.已有的研究表明南海北部天然气水合物的气源主要为生物气、混源气(生物气和热成因气),但是混合类型、混合比例尚不明确.本文在气源岩分析基础上,以...

Gas Source Mixing Types and Quantitative Characterization of Natural Gas Hydrate in Shenhu Area,Northern of South China Sea

The South China Sea is rich in natural gas hydrate resources, and the prospective gas hydrate resources are about 65 billion tons of oil equivalent. The study of natural gas hydrate petroleum system is a very important work, in which gas source is one of the most basic elements of natural gas hydrate petroleum system. Previous studies have shown that the gas sources of natural gas hydrates in the northern South China Sea are mainly biogenic gas and mixed source gas (biogenic gas and thermogenic gas), while the mixing type and mixing ratio are not clear. Based on the analysis of gas source rocks, the typical biogenic gas and thermogenic gas in this area are taken as the sources, and the proportion of source gas in the gas mixture is calculated quantitatively. The results show that the contribution ratio of thermogenic gas is up to 68%. The research results can provide reference for hydrate resource calculation.