文摘
In the first study of its kind, we analyze heavy ends of crude oils to characterize oil reservoirs by both insitu downhole fluid analysis (DFA) in oil wells along with heavy-end fingerprinting utilizing ultrahigh resolutionmass spectrometry. One of the biggest problems in the exploitation of oil reservoirs in high-cost settings is thedifficulty of characterizing flow connectivity or compartmentalization of the various permeable zones. Standardindustry methods to determine compartmentalization either fail or are prohibitively expensive. A relativelynew method of performing DFA on crude oils has identified compartmentalization on a regular basis and israpidly becoming an industry standard. Here, compartmentalization is established in an oil-containing verticallystacked sand-shale sequence by performing visible-near-infrared spectroscopy on crude oils in situ in the oilwell. These crude oils are then fingerprinted by electrospray ionization-Fourier-transform ion-cyclotron-resonance mass spectroscopy. This novel analysis protocol can lead to a more detailed understanding of thereservoir and provides a new utility for advanced methods of analytical chemistry; this charter fits within thenew field of petroleomics.