Received date: 2013-09-03
Revised date: 2013-11-19
Online published: 2014-06-10
P-wave velocity and S-wave velocity are the bridge of petrophysical property and seismic exploration.Through the study of P-wave velocity and S-wave velocity,we can get the effective identification of lithology,physical property and fluid.However,there is often lack of S-wave data in actual study,so S-wave velocity prediction is necessary.Now s-wave velocity prediction in clastic reservoir has developed very well,but in the carbonate reservoir,because the lithology and pore systems are very complex,the prediction accuracy is low and the development of prediction is slow.Xu-Payne model considered the effect of different pore type to elastic wave which can be used in carbonate reservoir theoretically.In this article,we introduce the method of S-wave velocity prediction which is based on rock physics,and analyze the effect of pore type on P-wave and S-wave velocity,such as stiff pores,inter-particle pores and crack.Also we compare it with other models,the prediction accuracy of Xu-Payne model is 2.9% higher than that by Xu-White model,so it is more consistent to the measured S-wave log.
Key words： S-wave velocity; Carbonate reservoir; Pore shape; Aspect ratio; Rock physics model
CHEN Qi-yan,GAO Jian-hu,DONG Xue-hua,JIANG Chun-ling . Shear Velocity Estimation in Carbonate Reservoir[J]. Natural Gas Geoscience, 2014 , 25(6) : 921 -927 . DOI: 10.11764/j.issn.1672-1926.2014.06.921
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