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題 名 | Estimation of Gas Hydrate Saturation Using Constrained Sparse Spike Inversion: Case Study from the Northern South China Sea=基於約束稀疏脈衝反演估算天然氣水合物飽和度:南海北部實例研究 |
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作 者 | 王秀娟; 吳時國; 徐寧; 張光學; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 17:4 民95.12 |
頁 次 | 頁799-813 |
專 輯 | 南海與臺灣鄰近地區之天然氣水合物研究專刊 |
分類號 | 457.8 |
關鍵詞 | 天然氣水合物; 飽和度; Gas hydrate; Free gas; Saturation; Acoustic impedance; South China sea; |
語 文 | 英文(English) |
英文摘要 | Bottom-simulating reflectors (BSRs) were observed beneath the seafloor in the northern continental margin of the South China Sea (SCS). Acoustic impedance profile was derived by Constrained Sparse Spike Inversion (CSSI) method to provide information on rock properties and to estimate gas hydrate or free gas saturations in the sediments where BSRs are present. In general, gas hydrate-bearing sediments have positive impedance anomalies and free gas-bearing sediments have negative impedance anomalies. Based on well log data and Archie’s equation, gas hydrate saturation can be estimated. But in regions where well log data is not available, a quantitative estimate of gas hydrate or free gas saturation is inferred by fitting the theoretical acoustic impedance to sediment impedance obtained by CSSI. Our study suggests that gas hydrate saturation in the Taixinan Basin is about 10 - 20% of the pore space, with the highest value of 50%, and free gas saturation below BSR is about 2 - 3% of the pore space, that can rise to 8 - 10% at a topographic high. The free gas is non-continuous and has low content in the southeastern slope of the Dongsha Islands. Moreover, BSR in the northern continental margin of the SCS is related to the presence of free gas. BSR is strong where free gas occurs. |
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