频率衰减梯度属性在南海北部神狐海域天然气水合物检测中的应用

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。

APPLICATION OF FREQUENCY ATTENUATION GRADIENT TO GAS HYDRATE PREDICTION: A CASE FROM SHENHU AREA,NORTHERN SOUTH CHINA SEA

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.