![]() ![]() ![]() ![]() Source rocks with high Hl 0 tend to generate saturate-rich oils with a high mean activation energy and a tight distribution of bond energies, which crack relatively slowly over a high but relatively narrow temperature range. Thus cracking rates are predictable using a simple, routinely performed geochemical screening measurement. The initial hydrogen index (Hl 0) of the sample, taken as an indirect measure of the saturate to aromatic ratio of the oil it generates, correlates strongly with optimized rate constants for oil cracking in individual samples. Cracking rates vary markedly between samples, depending on the saturate to aromatic ratio of the generated oil. This simple first-order kinetic model, calibrated on closed-system laboratory pyrolysis of 16 different source rock samples, describes the bulk conversion of oil (C 6+ molecular range) to gas (C 1–5 molecular range). Kinetic schemes describing oil-gas cracking are a required component of models which predict the masses, compositions and phases of petroleum expelled from source rocks an additional application is in predicting the temperature zone over which reservoired oil deposits will be degraded to gas. ![]()
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