南海淹没碳酸盐台地地震成像技术分析——以甘泉海台为例

淹没碳酸盐台地水深变化大且海底崎岖,地层结构复杂,导致二维反射地震资料发育大量多次波干扰,同时受采集环境影响,反射地震剖面广泛存在噪声干扰和大值干扰,给高分辨率成像带来挑战。甘泉海台作为南海北部典型的淹没碳酸盐台地,对其最新采集资料进行特征分析,采用低截滤波压制强涌浪噪声和异常振幅噪声衰减组合技术以及多步串联多次波压制技术,有效去除噪声干扰、大值干扰和复杂多次波,试验叠前时间偏移各项参数,最终大幅度提高甘泉海台地震剖面分辨率和信噪比,可为后续南海淹没碳酸盐台地二维地震资料处理提供借鉴。

Application of multi-channel two-dimensional transient Rayleigh wave exploration in goaf detection

The transient Rayleigh wave exploration has high detection accuracy in shallow exploration. The effect of detection array is comprehensive reflection of the velocity of rock and soil mass. Therefore, the roiling multi-channel transient acquisition system has been adopted in this study, which turns one dimensional transient Rayleigh wave exploration into two dimensions, consequently, the two-dimensional velocity distribution of rock and soil mass under the survey line has been achieved. Through comparing with the shallow seismic reflected wave exploration, the result indicates that the rolling multi-channel transient acquisition system has accurate resolution. Thus, in the process of the shallow reflected wave exploration, if the surface wave has developed, the coalition between the reflected wave exploration and the two-dimensional transient Rayleigh wave exploration should actualize the accuracy of exploration.