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頁籤選單縮合
題名 | The Characteristics of Fluid Potential in Mud Diapirs Associated with Gas Hydrates in the Okinawa Trough=沖繩海槽中伴隨天然氣水合物之泥貫入體的流體勢能特徵 |
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作者姓名(中文) | 徐甯; 吳時國; 王秀娟; 董冬冬; |
作者姓名(外文) | Xu, Ning; Wu, Shiguo; Wang, Xiujuan; Dong, Dongdong; |
書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 17:4 民95.12 |
頁次 | 頁871-881 |
分類號 | 351.925 |
語文 | eng |
關鍵詞 | 沖繩海槽; 天然氣水合物; Fluid potential; Velocity analysis; Gas hydrate; Mud diapir; Okinawa trough; |
英文摘要 | Many mud diapirs have been identified in the southern Okinawa Trough from a seismic survey using R/V KEXUE I in 2001. The movement and accumulation of free gas related to mud diapirs are discussed in detail by an analysis of fluid potential which is based upon velocity data. It can be found that free gas moves from the higher fluid potential strata to the lower ones and the gas hydrate comes into being during free gas movement meeting the proper criteria of temperature and pressure. In fact, gas hydrates have been found in the upper layers above the mud diapirs and in host rocks exhibiting other geophysical characteristics. As the result of the formation of the gas hydrate, the free gas bearing strata are enclosed by the gas hydrate bearing strata. Due to the high pressure anomalies of the free gas bearing strata the fluid potential increases noticeably. It can then be concluded that the high fluid potential anomaly on the low fluid potential background may be caused by the presence of the free gas below the gas hydrate bearing strata. |
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