ROCK PHYSICS MODEL FOR SIMULATING SEISMIC RESPONSE IN LAYERED FRACTURED ROCKS

摘要

Method for modeling anisotropic elastic properties of a subsurface regioncomprising mixed fractured rocks andother geological bodies. P-wave and fast and slow S-wave logs are obtained,and an anisotropic rock physics model of the subsurfaceregion is developed (21). P- and fast and slow S-wave logs at the welldirection are calculated using a rock physics model capableof handling fractures and other geological factors (22). Calculated values arecompared to measured values in an iterativemodel updating process (23). An upscaled ID model is developed by averagingelastic properties in each layer using an upscalingtheory capable of handling at least orthorhombic anisotropy (24). The ID modelmay be used to generate synthetic seismic responsefor well ties or AVO modeling (25). Further, a method is disclosed forestimating anisotropy parameters from P- andfast/slow S-wave logs from one or more deviated wells.