In the early stage,production wells are usually lack of S-wave logging data.Starting from this point,we probed the prediction of
S-wave logging by three methods based on Greenberg-Castagna formula,approximate Gassmann equation and Xu-White
model.Taking the prediction of S-wave moveout logging of the production wells from one oilfield as example,by comparing it
with the actual S-wave logging data,the application result of the three methods was analyzed,which shows that Greenberg-
Castagna formula is simple and practical,and can achieve good result in shaly sand formation after fluid
correction.Moreover,approximate Gassmann equation and Xu-White model are relatively complex,and the optimization on
input parameters will increase the precision of S-wave velocity prediction.
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