Jason反演技术在天然气水合物速度分析中的应用  

The Application of Jason Inversion Technology in Velocity Analysis of Gas hydrate

作　　者：梁劲[1] 王宏斌[1] 梁金强[1] 

机构地区：[1]广州海洋地质调查局,广州510760

出　　处：《南海地质研究》2006年第1期114-120,共7页Gresearch of Eological South China Sea

基　　金：广州海洋地质调查局科研项目(编号:GZJK200605)资助。

摘　　要：本文采用Jason反演技术对南海北部陆坡A测线纵波速度进行计算,结合BSR、振幅空白带以及波形极性反转等多种水合物赋存信息的分析,对水合物成矿带的速度特征进行了综合研究,结果表明:低速背景中的高速异常,是天然气水合物赋存的重要特征;高速异常体一般呈平行于海底的带状分布;在高速异常的内部,速度也是不断变化的。一般在异常体的中心速度最高,由中心到边缘速度逐渐降低,反映在水合物矿带内部,水合物饱和度由矿体中心向边缘逐渐降低的特征。本文的研究成果进一步表明高精度速度分析不仅可以帮助寻找水合物矿点,还可以进一步判定水合物的富集层位。The P velocity of A seismic profile in the north slope of the South China Sea were calculated by Jason inversion method. The velocity characterostic of the gas hydrate bed was researched in detail based on the calculated result and the information of gas hydrate existing including BSR, amplitude blanking and polarity reversion of the waveform. Research shows that： The abnormity of higher velocity in the background of lower velocity is an important characteristic of gas hydrate existing; The abnormity of higher velocity which distribute as a belt usually parallel to the seafloor; The velocity changes gradually at the inner of the abnormity of higher velocity with the highest velocity at the center of the abnormity whereas the lowest velocity at the margin of it, which suggests that the saturation of gas hydrate decreases gradually from the center to the margin. The result that mentioned above suggest that high resolution velocity analysis not only help to search the hydrate spot but also help to estimate the rich layer of gas hydrate.

关 键 词：JASON反演技术 天然气水合物 速度分析 

分 类 号：P744.4[天文地球—海洋科学]