| 裂隙充填型天然气水合物的各向异性分析及饱和度估算——以印度东海岸NGHP01-10D井为例 |
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| 引用本文： | 王吉亮,王秀娟,钱进,吴时国.裂隙充填型天然气水合物的各向异性分析及饱和度估算——以印度东海岸NGHP01-10D井为例[J].地球物理学报,2013,56(4):1312-1320. |
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| 作者姓名： | 王吉亮 王秀娟 钱进 吴时国 |
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| 作者单位： | 1. 中国科学院海洋研究所 海洋地质与环境重点实验室,青岛 266071;
2. 中国科学院大学,北京 100049;
3. 国土资源部海洋油气资源与环境地质重点实验室,青岛 266071 |
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| 基金项目： | 国际科技合作计划，国家自然科学基金项目 |
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| 摘 要： | 沿裂隙发育的天然气水合物是印度深水盆地细粒沉积物中水合物的重要产出方式,水合物以结核状或脉状充填在高角度裂隙中.天然气水合物主要沿着构造主应力方向生成,由于裂隙的存在,含水合物的沉积物层呈现各向异性.利用孔隙介质中水合物呈均匀分布的速度模型计算的NGHP01-10D井水合物饱和度高达40%,而压力取芯表明水合物饱和度占孔隙空间的20%左右.为了研究水合物饱和度差异,基于层状介质的各向异性模型计算了裂隙充填型水合物的饱和度.在垂直井孔中,由于波入射角与裂隙倾角有关,考虑裂隙倾角变化,利用纵波和横波速度同时反演水合物饱和度和裂隙倾角.利用层状介质模型计算的水合物占孔隙空间的15%～25%,裂隙的倾角在60°～90°,多为高角度裂隙.在NGHP01-10D井中,纵横波速度联合计算的饱和度与压力取芯结果吻合更好.
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| 关 键 词： | 天然气水合物 裂隙 饱和度 各向异性 印度 |
| 收稿时间： | 2012-03-21 |
Anisotropic analysis and saturation estimation of gas hydrate filled in fractures:a case of site NGHP01-10D, offshore eastern India |
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| WANG Ji-Liang
,
WANG Xiu-Juan
,
QIAN Jin
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WU Shi-Guo.Anisotropic analysis and saturation estimation of gas hydrate filled in fractures:a case of site NGHP01-10D, offshore eastern India[J].Chinese Journal of Geophysics,2013,56(4):1312-1320. |
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| Authors: | WANG Ji-Liang WANG Xiu-Juan QIAN Jin WU Shi-Guo |
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| Institution: | 1. Key Laboratory of Marine Geology & Environment, Institute of Oceanology, the Chinese Academy of Sciences, Qingdao 266071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources (MRE201105), Qingdao 266071, China |
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| Abstract: | Gas hydrate filled in fractures was the important occurrence morphology in fine-grained sediments from deep basin of India. Gas hydrate existed as solid nodules and subhorizontal veins filled in high angle fractures. Gas hydrate was formed along the tectonic principal stress. Gas hydrate filled in fractured reservoir shows anisotropic properties. Gas hydrate saturation estimated from NGHP01-10D was about 40% of the pore space using isotropic velocity model. However, gas hydrate saturation estimated from pressure cores was about 20% of the pore space. To reconcile the difference, an anisotropic model based on laminated media was used to estimate gas hydrate saturation in fractured reservoir. In vertical borehole, the incident angles of wave propagation have a relation with fracture dip angles. Gas hydrate saturations and fracture dip angles can be estimated from both P-wave and S-wave velocities obtained from the logging data. Gas hydrate saturations estimated from NGHP01-10D vary from 15% to 25% of the pore space using anisotropic velocities for laminated media. The fractures are high angle fractures and the dip angles vary from 60 to 90 degrees. The saturations estimated using the new method fit the results estimated from pressure core gassing well. |
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| Keywords: | Gas hydrate Fracture Saturation Anisotropic India |
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