| P-SV波反射系数近似及其AVO属性特征 |
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| 关键词:P-SV wave reflection coefficient AVO analysis background trend crossplotting |
| 基金项目:国家自然科学基金项目(编号:49874029)，高等学校博士学科点专项科研基金项目(编号:97018705)，教育部回国人员启动基金(编号:981303005)，教育部骨干教师资助计划长江学者专项基金共同资助 |
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| P-SV Wave Reflection Coefficient Approximations and Characteristics of AVO Attributes |
| To make variations of P-SV wave reflection coefficient characteristics with incidence angle clearer and more convenient for AVO analysis and parameter inversion with multi-attributes, the authors used Snell law to rewrite the angle of emergence related to shear-wave of P-SV wave reflection coefficient approximation given by Aki & Richards as sine function of incidence angle, employed binomial expansion to the latter, reserved the two headmost items and introduced the bi-angle of incidence to replace the terms related to cosine function of angle of incidence. On such a basis, a new approximation equation for P-SV wave was put forward which has a simple form and doesn′t involve the angles of incidence and emergence related to shear-wave. To analyze the accuracy of the new equation, the authors made computation and compared such reflection coefficient equations as Zoeppritz′s equation and Aki approximation with the new expression for different models under different lithologic interfaces. The results show that the new approximation can accurately describe characteristics of P-SV wave amplitude varying with offset when the angle of incidence is less than, with the precision even higher than that of Aki and Richards. Based on writing the new approximation in different forms, the authors also analyzed AVO background trends and characteristics of AVO crossplottings for 25 different gas sand models with different AVO attribute combinations, and dealt with the procedures of extracting fundamental lithologic parameters such as density contrast and velocity contrast and the methods for constructing variousseismic attribute sections from these new attributes. From the analysis and the corresponding discussion, it is concluded that the new expression has a high precision and can construct multi-attribute AVO crossplottings, and that one can easily construct such non-conventional seismic attribute sections as and fluid factors, shear modulus, and compression-to-shear-wave velocity. These conclusions are of significance in P-SV wave AVO analysis and elastic AVO theoretical investigation. |
| SUN Peng-yuan,SUN Jian-guo,LU Xiu-li.2006.P-SV Wave Reflection Coefficient Approximations and Characteristics of AVO Attributes[J].Acta Geoscientica Sinica,27(1):85-89. |
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