逆时偏移处理技术在复杂断块中的研究与应用

Application of Reverse-time Migration Processing Technique in Complex Fault Block

北部湾盆地复杂断块油田断裂结构复杂,受断层影响地震资料成像效果受到一定限制。逆时偏移处理技术在陡倾构造中成像效果显著,有鉴于此将逆时偏移处理技术应用在改善复杂断块油田地震资料地层与断层成像中。逆时偏移采用双程波动方程求解,没有速度近似、无倾角限制。通过模型试验证明逆时偏移实现了真振幅成像,能量归位更加精确,有利于储层及特殊岩性体的识别。将逆时偏移成像处理技术应用于复杂断块实际地震资料处理中,该方法有效地改善了断层成像,提高了储层的识别能力。

The fault structure of fault block oilfield in Beibu Gulf Basin is complex, and the imaging effect of seismic data is limited by faults. The inverse time migration processing technology has a remarkable imaging effect in steep structures. In view of this, the inverse time migration processing technology is applied to improve the stratigraphic and fault imaging of seismic data in complex fault block oilfields. Inverse time migration is solved by twoway wave equation, without velocity approximation and inclination limitation. The model test shows that the reverse time migration realizes the true amplitude imaging, and the energy homing is more accurate, which is conducive to the identification of reservoir and special lithologic body. The inverse time migration imaging technology is applied to the actual seismic data processing of complex fault blocks. This method effectively improves the fault imaging and improves the reservoir identification ability.