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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。
In this paper, Jason inversion technique was used to calculate the longitudinal wave velocity of A line in the southern slope of the South China Sea. Combined with the information of occurrences of BSR, amplitude blank band and polarity reversal of multiple hydrates, the velocity characteristics of the hydrate metallogenic belt The results show that high-speed anomalies in low-velocity background are important features of gas hydrate occurrence. High-velocity anomalies are generally strip-like distribution parallel to seafloor. In the high-velocity anomalies, the velocity is constantly changing. Generally, the center velocity of the anomalous body is the highest, and the velocity from the center to the edge is gradually decreased. It is reflected in the hydrate ore zone that the hydrate saturation gradually decreases from the ore body center to the edge. The research results in this paper further indicate that high-precision velocity analysis can not only help find hydrate ore spots, but also further determine the hydrate rich reservoirs.