Abstract
Abstract The MC252 reservoir fluid (oil with dissolved gas) underwent tremendous changes to its physical and chemical properties through multiple processes, including, but not limited to, evaporation, dissolution, dispersion, emulsification, biodegradation and sedimentation, as it moved along a path from the reservoir to the wellhead, then to the water column, to the sea surface, and in some cases, to the shoreline. These changes were characterized and documented through extensive GC, GCMS, and isotope analysis of hundreds of oil, oil-water emulsion, and tarball samples in this fingerprinting study. In the first part of this path, from reservoir at 18,000 feet deep to the sea surface, MC252 fluid lost up to 40% of its weight (mostly gas range and soluble aromatic components). Phase separation (gas exsolution) and dissolution in water were the main processes responsible for this mass loss. These processes substantially removed compounds smaller than C7, as shown by the composition of oil and oil-water samp...
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