摘要
采用射线追踪法对南海北部陆坡A测线层速度进行计算,结合BSR(Bottom Simulating Reflector)、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;在高速异常体的内部,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。研究结果还表明,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 interval velocity of seismic profiles A in the North slope of the South China Sea were calculated by the methods of ray-tracing method. The velocity characteristics of the gas hydrate bed were studied in detail based on the calculated results and the information,including BSR, amplitude blanking and polarity reversion of the waveform. It is shown that the higher velocity zone in the lower velocity background is an important characteristic of gas hydrate existing. That the higher velocity zone usually parallel the seafloor, and the velocity changes gradually in the higher velocity zone with the highest velocity at the center whereas the lowest at the margin, suggest that the saturation of gas hydrate zone decreases gradually from the center to the margin. The study reveals that the high-resolution velocity analysis is useful not only to search the hydrate spot but also to estimate the rich layer of gas hydrate.
出处
《物探化探计算技术》
CAS
CSCD
2007年第6期486-491,468,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
广州海洋地质调查局科研资助项目(GZJK200605)
