Shear wave velocity estimation based on rock physics diagnosis
Tang Jie1,2, Wang Hao1,2, Yao Zhen'an1,2, Li Jingjing1,2, Zhao Aiguo1,3
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266555, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
3. Geophysical Research Institute, Shengli Oilfield of Sinopec, Dongying, Shandong 257022, China
Abstract：S-wave velocity is critical information for prestack seismic inversion and prestack seismic attribute analysis. But S-wave velocity in logging data usually is lacked. We propose in this paper S-wave velocity estimation based on rock physics diagnosis. First we analyze the factors affecting rock velocity based on the constant cement model. Both the solid part such as clay composition, porosity, precipitation model and coordination number, and the fluid part such as saturation, gas-oil ratio, and fluid mixture affect calculation. Then using Gassmann equation and the constant cement model and taking score of consolidation as the adjustable factor in the inversion process, we obtain rock cemented fractional value by rock P-wave wave velocity inversion. Finally we carry out shear wave velocity estimation. Log data processing tests prove that the proposed method can accurately and efficiently predict the shear wave velocity.
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