Multiscale rock-physics templates for gas detection in carbonate reservoirs |
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| Institution: | 1. Geophysical Department, Research Institute of Petroleum Exploration & Development, PetroChina, 100083 Beijing, China;2. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42c, Sgonico, Trieste 34010, Italy;3. Zhou Pei-Yuan Center for Applied Mathematics, Tsinghua University, 100083 Beijing, China;4. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China;1. Sinopec Geophysical Research Institute, Nanjing 211103, China;2. Center of Rock Mechanics and Geohazards, Shaoxing University, Shaoxing 312000, China;3. School of Civil Engineering, Southeast University, Nanjing 210096, China;4. College of Geo Exploration Science and Technology, Jilin University, Changchun 130026, China;1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. School of Geosciences, King''s college, University of Aberdeen, AB24 3UE Aberdeen, UK |
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| Abstract: | The heterogeneous distribution of fluids in patchy-saturated rocks generates significant velocity dispersion and attenuation of seismic waves. The mesoscopic Biot–Rayleigh theory is used to investigate the relations between wave responses and reservoir fluids. Multiscale theoretical modeling of rock physics is performed for gas/water saturated carbonate reservoirs. Comparisons with laboratory measurements, log and seismic data validate the rock physics template. Using post-stack and pre-stack seismic inversion, direct estimates of rock porosity and gas saturation of reservoirs are obtained, which are in good agreement with oil production tests of the wells. |
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