基于谱反演估算神狐海域含水合物沉积层厚度

doi:10.11978/j.issn.1009-5470.2015.03.007

热带海洋学报 ›› 2015, Vol. 34 ›› Issue (3): 54-61.doi: 10.11978/j.issn.1009-5470.2015.03.007CSTR: 32234.14.j.issn.1009-5470.2015.03.007

基于谱反演估算神狐海域含水合物沉积层厚度

孙运宝^{1, 2}, 赵铁虎², 秦轲², 冯京²

1. 国土资源部海洋油气资源与环境地质重点实验室, 青岛海洋地质研究所, 山东青岛 266071; 2. 青岛海洋地质研究所, 山东青岛 266071

收稿日期:2014-05-28 修回日期:2014-08-22 出版日期:2015-06-08 发布日期:2015-06-08
作者简介:孙运宝(1983~), 男, 山东省烟台市人, 助理研究员, 博士, 主要从事水合物形成机理数值模拟研究。E-mail: yunbaos@sina.com
基金资助:
中国博士后基金(2012M521296); 国家自然科学基金(41306037); 中国地质调查局国家专项工作项目(GZH201100308)

Time-frequency-based thickness estimation of hydrate-bearing layer in the Shenhu area of the South China Sea

SUN Yun-bao^{1, 2}, ZHAO Tie-hu², QIN Ke², FENG Jing²

1. Key Laboratory of Marine Hydrocarbon Resource and Enviroment Resources, Ministry of Land Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China; 2. Qingdao Institute of Marine Geology, Qingdao 266071, China

Received:2014-05-28 Revised:2014-08-22 Online:2015-06-08 Published:2015-06-08

摘要/Abstract

摘要： 文章采用基于特殊处理数据的叠后谱反演方法对南海北部陆坡神狐海域的含水合物沉积层厚度进行预测。正演模拟结果表明, 谱反演技术可以精细识别异常地质体, 获取高分辨率的反射系数剖面。结合研究区高信噪比地震资料, 基于频谱分析, 发现在频率剖面上含水合物沉积层主要表现为低频高能、高频低能或高频盲区之上的低频低能、高频高能或高频低能区, 含水合物沉积层顶底界面均存在频率异常, 且含水合物沉积层底界衰减最为强烈, 通过谱反演, 发现获取的反射系数剖面比原始地震数据分辨率更高, 且与实际测井结果可对比, 通过定义-90°相位旋转后谱反演结果上振幅为零值的点之间的距离为地层厚度, 计算的过井含水合物沉积层厚度与测井估算结果吻合度高。研究表明, 该方法可以获取精度较高的含水合物沉积层厚度信息, 实现精度较高的水合物储量估算。

关键词: 南海, 神狐, 水合物, 时频, 资源量

Abstract: Gas hydrate has attracted great interest from the scientists for the impact of its fossil fuel resource potential, the extent of submarine geohazard and global climate change. Thickness of a hydrate-bearing layer is an important parameter in resource evaluation. Quantitative identification of potential gas hydrate accumulation needs to pay urgent attention to the technology in pre-drilling assessment. Thickness of a hydrate occurrence can be identified by the time-frequency analysis method. The result suggests that the time-frequency analysis method, guiding by the logging data, may be an effective tool to identify thick hydrate-bearing layers. A hydrate-bearing layer tends to appear as a low-frequency low intensity zone, underlying a low-frequency high intensity and high-frequency low intensity zone.

Key words: South China Sea, Shenhu, hydrate, time-frequency, resource

孙运宝, 赵铁虎, 秦轲, 冯京. 基于谱反演估算神狐海域含水合物沉积层厚度[J]. 热带海洋学报, 2015, 34(3): 54-61.

SUN Yun-bao, ZHAO Tie-hu, QIN Ke, FENG Jing. Time-frequency-based thickness estimation of hydrate-bearing layer in the Shenhu area of the South China Sea[J]. Journal of Tropical Oceanography, 2015, 34(3): 54-61.

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基于谱反演估算神狐海域含水合物沉积层厚度

Time-frequency-based thickness estimation of hydrate-bearing layer in the Shenhu area of the South China Sea

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