Experimental studies on the occurrence, formation, and dissociation of methane hydrates.

甲烷水合物的发生、形成和解离的实验研究。

• 批准号: 07559004
• 负责人: MATSUMOTO Ryo
• 金额: $ 7.1万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07559004/
• 关键词: ODP Leg164; distribution of methane hydrate; synthesis of gas hydrates; oxygen isotopic composition; CO2 hydrate; induction time; 分布規制要因; PH多様性; ガスハイドレート; 合成実験; 海底疑似反射面; 圧力容器; メタンハイドレート; ODP Ley164; 深海堀削; ブレークリッジ

For the first year of this project, experimental apparatus was designed, manufacutured and installed in the laboratory. Head investigator participated in ODP Led 164 cruise to recover natural gas hydrates from deep sea sediments in the area of Blake Ridge, Atlantic. Therefore, most of experimental and analytical data were obtained for the second year.1, Marine gas hydrates of blake Ridge were observed to occur in sediments between 200 and 450 meters below sealevel. The lower limit is easily explained interms of temperature and pressure of the sediments, but the upper limit is likely to be controled by drastic changes in mineralogy, lithology, and physical roperties at that depth.2, Oxygen isotopic fractionation between methane hydrates and ambient interstitial water was analyzed to be 3-4 permil. These values are similar to the fractionation between ice and water.3, CO_2 hydrates were synthesized in pure water with pH of 3.2-3.3, and in CH3CO2Na-CH3CO2H buffer solutions with pH of 3.1 and 5.2. Total concentration of acetic acid and acetate anion of the buffer solutions range between 0.2M AND 1M.The results imply that change of pH value has minimum influence on the equilibrium condition of CO_2 hydrate. The equilibrium condition are mainly controlled by the total concentration of acetic acid and acetate anion, and Na+ cation plays a minimum role. The total concentration also controls the induction time for the formation of CO_2 hydrate in the pH buffer solutions. The solubility change of CO_2 gas in solutions, which is possibly caused by the pH variation, is another factor controlling the induction time.

在该项目的第一年中，设计，制造和安装在实验室中。主管调查员参加了ODP，导致164巡航，从大西洋布雷克·岭地区的深海沉积物中恢复天然气水合物。因此，第二年获得了大多数实验数据和分析数据。1，观察到Blake Ridge的船用气体水合物发生在海平面低于200至450米之间的沉积物中。下极限很容易解释沉积物的温度和压力之间的互动，但是上限很可能通过该深度的矿物学，岩性和物理繁殖的急剧变化来控制。2水被分析为3-4腐烂。这些值类似于冰和水之间的分馏。3，在pH为3.2-3.3的纯水中合成了CO_2水合物，在CH3CO2NA-CH3CO2H缓冲液中，pH为3.1和5.2。缓冲溶液的乙酸和乙酸阴离子的总浓度在0.2m至1之间。结果表明，pH值的变化对CO_2水合体的平衡条件的影响最小。平衡条件主要由乙酸和乙酸阴离子的总浓度控制，而Na+阳离子起着最小作用。总浓度还控制了pH缓冲溶液中CO_2水合物形成的诱导时间。溶液中CO_2气体的溶解度变化可能是由pH变化引起的，是控制诱导时间的另一个因素。

项目成果

松本 良 他: "海洋のガスハイドレートの分布と産状-ODPLeg164ブレークリッジ掘削-" 地質学雑誌. 102(11). 932-944 (1996)

Ryo Matsumoto 等人：“海洋中天然气水合物的分布和发生 - ODPLeg164 Blake Ridge 钻井 -”地质杂志 102(11) 932-944 (1996)。

松本良: "エネルギー資源としてのガスハイドレート" 日本雪氷学会誌. 59. 41-44 (1997)

Ryo Matsumoto：“天然气水合物作为能源”日本冰雪学会杂志 59. 41-44 (1997)。

松本 良: "炭酸塩のδ^<13>C異常の要因と新しいパラダイム「ガスハイドレート仮説」" 地質学雑誌. 101(11). 902-924 (1995)

Ryo Matsumoto：“碳酸盐 δ^13C 异常的原因和新范式‘天然气水合物假说’”地质杂志 101(11) (1995)。

松本 良: "炭酸塩のS^<13>C異常の要因と新しいパラダイム「ガスハイドレート仮説」" 地質雑. 101. 902-124 (1995)

Ryo Matsumoto：“碳酸盐中S^ 13 C异常的原因和新范式‘天然气水合物假说’”地质杂志101. 902-124 (1995)。

Matsumoto, R.: "Gas hydrates as energy resourcec." Seppyou. 59. 41-44 (1997)

Matsumoto, R.：“天然气水合物作为能源。”