Explorationists use rock property and reflectivity modeling to understand the frequently ambiguous amplitude and AVO signatures in seismic data. In that quest, great effort is placed on understanding the elastic reservoir properties and their dependence on pore fluid. Yet seismic reflection data measure changes in elastic rock properties across interfaces. It then necessarily follows that the elastic properties of the sealing cap rock are as important to the reflectivity solution as are those of the reservoir.

Pore pressure has greater influence on the elastic properties of shale than it has on the properties of sand. This phenomenon occurs primarily because...

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