For decades, the main use of seismic data has been to delineate sedimentary bodies and tectonic features in the subsurface. The mission of seeing inside the geologic body has been added recently. Mapping porosity, lithology, and other reservoir bulk properties inside the geologic body has become possible due to the recent dramatic improvement in seismic acquisition, imaging, and inversion quality as well as the accompanying progress of rock physics.

Rock physics provides transforms between a reservoir's elastic properties and its bulk properties, including porosity, lithology, pore fluid, and pore pressure. Such transforms are known as trends. Trends are built...

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