Technologies with Two Azimuths in West Area of South China Sea:A Case Study of Zhusan Sag
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摘要: 南海西部海域珠三凹陷地区地下断裂体系复杂，不同的勘探阶段采集的地震资料，方位角窄，复杂断裂带成像困难，而同一批次采集多方位三维地震采集难度大、成本高.为了更好地实现宽方位地震成像目的，可将不同年度不同方位采集的三维地震资料结合先进的多次波去除技术和地震融合技术进行联合处理，从而间接形成一个宽方位三维地震资料，据此操作将极大地降低采集成本，从实际处理效果对比分析，该方法较好地改善了复杂断裂带的成像效果.Abstract: The fault system in the Zhusan Sag area of the western South China Sea is complex. The seismic data acquired at different exploration stages has a narrow azimuth,and it is difficult to image the complex fracture zones. The seismic data with different azimuths in the same batch need higher operation technology and higher cost.In order to achieve the purpose of wide-azimuth seismic imaging,3D seismic data acquired in different orientations in different years can be combined with advanced multiple suppression technology and seismic fusion technology to indirectly form a wide-azimuth 3D seismic data. This operation will greatly reduce the acquisition cost. The comparison and analysis of the actual imaging effect indicate this method can better improve the imaging effect of the complex fracture zone.
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Key words:
- Zhusan Sag /
- complex fault system /
- multiple suppression /
- fusion processing /
- geophysics
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图 1 不同期采集的地震方位
Fig. 1. The sketch map showing different azimuths on seismic acquisition
图 3 同一位置不同方位速度谱对比
a为2010年北东向速度资料; b为1996年北西向速度资料
Fig. 3. Velocity spectrum of the same survey area in different direction
图 4 新老资料偏移成果对比
a.149/329°处理成果；b. 16/196°处理成果；c.双方位融合后偏移成果
Fig. 4. Migration of old and new seismic data
图 5 简单模型浅水多次波射线路径示意图
Fig. 5. The sketch map of rays path about multiple in shallow water from simple model
图 6 浅水多次波压制原理
a, b为海底一次反射形成的多次波; c, d为地下地层的反射在海底形成的多次波
Fig. 6. The sketch map shows suppressing multiple in shallow water
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