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| | 講演要旨(英文) | | After recent advancement in exploration geophysics, the concept of shear or S-wave velocity emerged as an idea of fluid discrimination, fracture identification, and AVO modeling. However, an accurate prediction of shear wave velocity is still a great challenge in the industry. Based on rock physics theory, we proposed a simple, effective and reliable method for the estimation of S-wave velocity in the highly heterogeneous gas sand reservoir. Firstly, we calculate minerals content and calibrate them with laboratory based XRD. Then, dry rock modulus is calculated with three different models (Krief, Nur, and Pride). Finally, estimated S-wave velocities from three different models through Gassmann theory were compared and correlated with logged S-wave velocity data and choose the best fit model. Pride model, among others, provides reliable, effective and error free results and can be applied with confidence in the heterogeneous gas sand reservoir for S-wave velocity prediction. |
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