基于保幅单程波延拓算法的叠前AVP成像方法  

Pre-stack AVP Imaging Method Based on Amplitude-preserv One-way Wave Extrapolation Algorithm

作　　者：吕彬[1] 王西文[1] 王宇超[1] 

机构地区：[1]中国石油勘探开发研究院西北分院

出　　处：《岩性油气藏》2010年第F07期68-71,共4页Lithologic Reservoirs

摘　　要：基于共聚焦点技术的叠前AVP（振幅随射线参数变化）分析方法与叠后反演方法相比具有明显优势。目前通过褶积和互相关两步数学运算来实现的方法依赖于聚焦算子。而在复杂构造区走时计算困难且子波难以精确提取．从而导致了聚焦算子不准确，而且会影响信噪比和分辨率。为了进一步提高对复杂构造的适应性以及振幅保持性，文中提出了基于保幅单程波延拓算法的叠前AVP成像方法。具体的延拓算子选取保幅傅里叶有限差分延拓算子，从而可以充分发挥保幅傅里叶有限差分延拓算法在复杂构造适应性及其保幅性方面的优势。该方法在继承了传统叠前AVP成像方法优势的同时，能够更好地适应复杂构造，因而能够得到质量更高的成像结果。Compared with the post-stack inversion method, the pre-stack AVP （amplitude-versus-ray parameter） imaging method based on CFP（common focusing point） technology has remarkable advantages. In the current methods using convolution and cross-correlation arithmetical operation, it is dependent on focusing operators and calculation is difficult for complex structures with accurate wavelets hardly extracted, leading to inaccurate focusing operators and impacts on S/N ratio and resolution. In this paper, a pre-stack AVP imaging method based on the amplitude-preserved one-way wave extrapolation algorithm is proposed in order to enhance the adaptability of the method to complex structures and the amplitude preservation. The amplitude-preserved FFD （Fourier finite difference） extrapolation operators are chosen to take fully the advantages of amplitude-preserving characteristic and complex structure adaptability of the amplitude-preserved FFD extrapolation algorithm. This AVP imaging method has inherited not only the conventional method＇ s advantages, but also can adapt to complex structures, providing high-quality images.

关 键 词：真振幅 单程波方程 傅里叶有限差分 共聚焦点技术 AVP 

分 类 号：P631.4[天文地球—地质矿产勘探]