Many mature oil fields in the North Sea are experiencing challenges with respect to increasing H2S production representing big economical challenges. The current manuscript is describing an attempt to extract information about these issues using a “macroscale” reservoir simulation approach for a large mature offshore field in the North Sea. The strategy chosen is to assume that the underlying processes of microbial, chemical and physical origin are capturing generation and transport of H2S in the reservoir with sufficient accuracy by applying only two major variables in a reservoir souring simulation tool (SourSimRL (SSRL)). Such a strategy is driven both from a practical (constrained on time) as well as a scientific point of view (Occam’s razor - be able to make useful conclusions). The overall goal of the research reported is to identify a total simulation workflow capable of reducing the uncertainty in future predicted H2S vs. time for each individual well and the total field production.


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