Things that change with time
This section lists and "flags" those reservoir properties that may change with time and result in seismic differences. It also gives insight into the typical extent of the changes that may be experienced. A later section covers predicting possible seismic changes.
During the hydrocarbon extraction process, those primary reservoir properties that change with time include:
Secondary effects of hydrocarbon extraction include compaction, porosity, density, overburden stress, fracturing and chemical changes.