| 天然气水合物和游离气饱和度估算的影响因素 |
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| 引用本文： | 王秀娟,吴时国,刘学伟.天然气水合物和游离气饱和度估算的影响因素[J].地球物理学报,2006,49(2):504-511. |
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| 作者姓名： | 王秀娟 吴时国 刘学伟 |
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| 作者单位： | 1.中国科学院海洋研究所，青岛 266071 2中国科学院研究生院，北京 100039 3 中国地质大学地球探测与信息技术学院，北京 100083 |
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| 基金项目： | 中国科学院知识创新工程重要方向性项目（KZCX3-SW-219）和国家自然科学基金项目（40276022）资助. |
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| 摘 要： | 讨论了不同水合物胶结类型的流体饱和多孔隙固体中地震波的衰减情况，分析了估算天然气水合物和游离气饱和度影响因素.结果表明, 地层孔隙度、纵波速度模型和弹性模量的计算方法是影响反演水合物和游离气饱和度的关键因素.含水合物地层的吸收与水合物胶结类型密切相关，当水合物远离固体颗粒,像流体一样充填在孔隙时，品质因子出现负异常，而当水合物胶结固体颗粒影响骨架的弹性性质，其品质因子出现正异常.根据布莱克海台地区164航次995井的测井资料，分别应用低频和高频速度模型估算了水合物和游离气饱和度.由低频速度模型得到的水合物饱和度(占孔隙空间的)10%～20%，游离气饱和度(占孔隙空间的)05%～1%；而由高频速度模型得到的水合物饱和度(占孔隙空间的)5%～10%,游离气饱和度(占孔隙空间的)1%～2%.
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| 关 键 词： | 天然气水合物和游离气 饱和度 纵波速度 品质因子 |
| 文章编号： | 0001-5733（2006）02-0504-08 |
| 收稿时间： | 2005-03-21 |
| 修稿时间： | 2005-03-212005-12-10 |
Factors affecting the estimation of gas hydrate and free gas saturation |
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| WANG Xiu-Juan,WU Shi-Guo,LIU Xue-Wei.Factors affecting the estimation of gas hydrate and free gas saturation[J].Chinese Journal of Geophysics,2006,49(2):504-511. |
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| Authors: | WANG Xiu-Juan WU Shi-Guo LIU Xue-Wei |
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| Institution: | 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3 School of Geophysics and Geoinformation Systems, China University of Geosciences, Beijing 100083,China |
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| Abstract: | Attenuations of different types of gas hydrate cementation in fluid-saturated porous solids are discussed. The factors affecting estimation of gas hydrate and free gas saturation are analyzed. It is suggested that porosity of sediment, the P wave velocity model and methods of calculating elastic modulus are key factors in the estimation of gas hydrate and free gas saturations. Attenuation of gas hydrate-bearing sediment is closely related with the cementation types of gas hydrate. Negative anomalies of quality factors indicate that gas hydrate deposits away from grain as part of fluid. Positive anomalies of the quality factors indicate that gas hydrate contacts with solid and changes the elastic modulus of matrix. Low frequency velocity and high frequency velocity models are used to estimate gas hydrate and free gas saturation in the Blake Ridge area according to the well log data of the hole 995 in ODP leg 164. The gas hydrate saturation obtained by low frequency velocity is 10% -20% of the pore space and free gas saturation is 0.5% - 1% of the pore space. The gas hydrate saturation obtained by high frequency velocity is 5% - 10% of the pore space and free gas saturation is 1% 2% of the pore space. |
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| Keywords: | Gas hydrate and free gas Saturation Compressional wave velocity Quality factor |
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