Simulation study on the accuracy of ocean vertical cable detection based on multiples reverse time migration
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摘要:
海洋垂直缆地震勘探是一种将水听器垂直布放到水中的探测新技术，与传统的拖缆地震勘探相比，具有高分辨率和高信噪比的优势。针对海洋垂直缆观测系统的不同造成的地震照明密度差异特点，采用多次波逆时偏移成像方法，对Marmousi模型进行基于声波方程的垂直缆地震采集正演模拟和成像处理，分析了垂直缆地震勘探方法的探测精度。结果表明，当垂直缆位于勘探区域的中部时，对勘探目标层的成像更为有利，对含有自由表面多次波的地震数据进行成像能有效增加地下的照明范围，使得高陡构造区域的成像结果更为清晰。该研究对海洋垂直缆地震勘探观测系统设计和高精度成像处理意义重大。
Abstract:Marine vertical cable seismic survey is a new exploration technology that deploys hydrophones vertically into the water. Compared with traditional streamer seismic survey, it has the advantages of high resolution and high signal-to-noise ratio. In view of the different characteristics of seismic illumination density duo to different marine vertical cable observation systems, the multiple reverse time migration imaging was used to conduct forward simulation and imaging process for vertical cable seismic acquisition based on acoustic wave equations for the Marmousi model, and the detection precision of vertical cable seismic exploration method was analyzed. Results show that when the vertical cable was located in the center of the exploration area, the imaging of the exploration target layer was most beneficial. Imaging seismic data that contain free surface multiples could effectively increase the underground illumination range, making imaging results clearer in high and steep structural areas. This research is of great significance to the design of marine vertical cable seismic exploration observation systems and high-precision imaging process.
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Key words:
- vertical cable /
- reverse time migration /
- multiples /
- forward simulation /
- precision analysis
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