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Reservoir souring is the phenomenon in which producing wells begin to produce H2S even though this gas was not present in the reservoir before production began. This problem is commonly encountered in waterfloods, particularly in those where seawater is used as the water-injection source. It is thought that approximately 80% of seawater floods have encountered a degree of reservoir souring at some time during field life.

The issue of reservoir souring has attracted considerable interest over the years because there are significant issues arising from the presence of H2S gas, including health, safety, and environment (HSE) concerns; corrosion; and gas sales contractual limits.

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