摘要
对于较复杂的理论模型和低信噪比的实际地震资料处理来说,用基于射线理论的有限差分走时法共聚焦点(CFP)成像技术生成的CFP偏移剖面不能精确地对地下构造成像。为此,探讨了基于波动方程的傅里叶有限差分法(FFD)共聚焦点(CFP)成像技术。该技术可以自动检测宏观速度场正确与否,大大提高了聚焦算子的计算精度和双聚型保幅成像精度。数值模拟验证了方法的正确性,实际资料处理验证了方法的有效性和实用性。与基于射线理论的有限差分走时法的CFP成像剖面对比结果表明,基于波动方程的CFP偏移剖面分辨率更高,层位更清楚,可以对地下构造清晰成像。
The common focus-point(CFP)imaging technology utilizes ray-theory-based finite difference travel-time method.In complex theoretical model and actual low S/N seismic data processing,the generated CFP imaging profiles can not exactly image the subsur- face structures.Therefore,the CFP using the wave-equation-based Fourier finite difference method is discussed.This technology can automatically detect the correctness of veloehy field,which greatly improves the computation accuracy of focusing operator and the ac- curacy of bifocal amplitude-preserving imaging.Numerical simula- tion has verified the correctness of the method and actual data pro- eessing has proved its validity and practicability.Compared to the ray-theory-based CFP imaging profiles,the wave-equation-based CFP profiles have higher resolution and clearer stratigraphie horizons, which can clearly image the subsurface structures.
出处
《石油物探》
EI
CSCD
2007年第4期329-333,共5页
Geophysical Prospecting For Petroleum
基金
国家自然科学基金(40474041)
CNPC中青年创新基金(04E7040)
中原油田和江苏油田博士后科研工作站资助
CNPC物探重点实验室中国石油大学(华东)研究室资助
关键词
共聚焦点成像
波动方程延拓
傅里叶有限差分
两步聚焦
振幅随射线参数变化分析
成像精度
common focus-point migration(CFP)
wave equation continuation
Fourier finite difference
two-step focusing
amplitude via ray parameter analysis
imaging accuracy