摘要
为了准确识别和预测天然气水合物的矿体特征,利用频率吸收衰减属性开展水合物矿体定量分析是十分必要的。在实际地震资料中,天然气水合物段对应的高频段能量衰减受随机噪音的影响较大,容易导致计算结果出现误差。改进的频率衰减属性提取方法能够减小随机干扰对地震频谱斜率拟合的影响,得到有效信号的频率吸收衰减属性。将该方法应用到南海北部神狐海域的天然气水合物检测中,计算的结果能够准确刻画天然气水合物矿体的边界,满足定量预测的需要,证实该方法能够对天然气水合物定量预测提供更多信息。
In order to accurately predict and evaluate the characteristics of gas hydrate deposits,quantitative study is required to be conducted by frequency attenuation gradient properties for seismic data.Influenced by random noise,it is easy to cause calculation error for the gas hydrate segments with high frequency attenuation gradients.An improved frequency attenuation properties extraction method is then proposed in this paper,which may reduce the random disturbance of the seismic spectrum slope fitting and get effective signal frequency absorption properties.The method was applied to the detection of gas hydrate in the Shenhu area in the northern South China Sea.The calculated results can accurately depict the boundary of the gas hydrate body to meet the needs in quantitative prediction of gas hydrate.
作者
李延
文鹏飞
张宝金
张如伟
LI Yan;WEN Pengfei;ZHANG Baojin;ZHANG Ruwei(Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou 510075,China;Guangzhou Marine Geological Survey,China Geology Survey,Guangzhou 510760,China)
出处
《海洋地质前沿》
CSCD
2019年第7期1-7,共7页
Marine Geology Frontiers
基金
自然资源部海底矿产资源重点实验室开放基金课题(KLMMR-2018-A-02)
中国地质调查局项目(DD20191007)
关键词
时频分解
频率吸收衰减属性
有效信号
水合物预测
神狐海域
南海
time-frequency domain decomposition
frequency absorption attenuation attributes
effective signal
hydrate prediction
Shenhu area
South China Sea
