地震反射AVO理论及其应用研究进展

Progress on AVO Theory and Its Application

主要针对近年AVO理论研究和AVO技术的应用案例,论述了当前AVO理论及其技术的进展,一是在反演中增加能反映岩性和流体变化的新弹性参数,例如加入品质因子等;二是改进算法提高AVO反演精度和加快反演速度,例如采用的贝叶斯反演法、PP波和PS波联合反演以及自适应步长反演等方法。在上述基础上,介绍了在碳酸盐岩储层预测以及方位AVO在一些地区的实际应用效果,展示了AVO在油气藏流体识别及流体边界检测具有较大的应用潜力。

With oil and gas exploration become more and more difficult, further development of geophysical methods for reservoir exploration is necessary. Amplitude vs. offset （AVO） technology rapidly developed due to its capability of directly identifying fluid from seismic profiles. This paper describes the AVO theory and its development progress with some examples of its application. Some new developments improving AVO applications include： （1） increasing new elastic parameters in the inversion which reflect lithology and fluid variation, such as adding a viscoelastic coefficients quality factor （2） improving the algorithm to increase the accuracy of AVO inversion and speed of inversion, such as using methods of Bayesian inver- sion, and jointing AVO inversion of PP and PS waves and adaptive step length for inversion. The applica- tion of AVO theory and azimuth AVO in carbonate reservoir prediction in some areas is discussed to show the potential of applying AVO theory in fluid identification for oil and gas reservoir and fluid boundary de- tection.