D06 CHARACTERIZATION OF SULFUR IN RESERVOIR ROCKS BY ROCK-EVAL ANALYSIS Abstract 1 As a result of steam or hot water injection reservoir rocks can generate significant amounts of H2S. Such recovery operations are therefore subject to corrosion and environmental risks which are currently difficult to predict. Previous works have shown that the formation of H2S is thermally induced by the alteration of organic sulfur in heavy oils (aquathermolysis). Other phenomena involving interactions between mineral sulfur (sulfates pyrite) and organic matter have been reported as sources of H2S as well. According to the current knowledge on these processes H2S can occur


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