geochemical survey, study of activated organic carbon and the mineral matrix effect on gurpi formation of alvand oil field, in sirri area (persian gulf)

In this study, 31 cutting samples from 2 wells, were subjected to geochemical analyses, assessing the hydrocarbon potentiality of gurpi formation as candidate source rock. the expected hydrocarbon generation characteristics, percentage of toc, level of maturity, role of neutral and active carbon and the mineral matrix effects are the main subjects of this investigation. so, the preliminary geochemical evaluation such as rock-eval pyrolysis was performed.by examining the obtained information, the type of hydrocarbon-generating properties and organic matter in gurpi formation mainly suggested the kerogen type ii and iii and lower range type iii. the sedimentation area was sub anoxic to oxidant that indicates moderate to rapid sedimentation rates.in terms of thermal maturity, the kerogen is in beginning of the oil window, early catagenesis stage. the mineral matrix adsorption rate of activated organic and neutral carbon of the samples, was calculated as 0.32, 0.81, 0.168 and 0.18, 0.72, 0.042, respectively.