J.P. Castagna
R.L. Brown
A.C.B. Ramos
Chen Hao
2001
<p>Amplitude versus offset (AVO) interpretation can be facilitated by crossplotting AVO intercept (<i>A</i>), gradient (<i>B</i>), and curvature (<i>C</i>) terms. However, anisotropy, which exists in the real world, usually complicates AVO analysis. Recognizing anisotropic behavior on AVO crossplots can help avoid AVO interpretation errors.</p><p>Using a modification to a three-term (<i>A</i>,<span> </span><i>B</i>, and<span> </span><i>C</i>) approximation to the exact anisotropic reflection coefficients for transversely isotropic media, we find that anisotropy has a nonlinear effect on an<span> </span><i>A</i><span> </span>versus<span> </span><i>C</i><span> </span>crossplot yet causes slope changes and differing intercepts on<span> </span><i>A</i><span> </span>versus<span> </span><i>B</i><span> </span>or<span> </span><i>C</i><span> </span>crossplots. Empirical corrections that result in more accurate crossplot interpretation are introduced for specific circumstances.</p>
application/pdf
10.1190/1.1487081
en
Society of Exploration Geophysicists
Three-parameter AVO crossplotting in anisotropic media
article