Production of hydrocarbons is usually accompanied by changes in reservoir pore pressure. Large changes in reflection amplitude have been observed around injectors, and result from the decrease in elastic wave velocity in the reservoir caused by the increase in reservoir pore pressure. In contrast, the velocity change resulting from the decrease in pore pressure in depleting reservoirs is much smaller in magnitude. The difference in the response of elastic wave velocities to injection and depletion is discussed in terms of the non-linearity of the response of elastic wave velocities to stress, the difference in reservoir stress paths between injection and depletion, and any damage induced by the changes in stress that occur.

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