Effect of hydrocarbon volatility and adsorption on source-rock pyrolysis |
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| Authors: | Martha E Tarafa John M Hunt Inger Ericsson |
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| Institution: | Woods Hole Oceanographic Institution, Woods Hole, MA 02543 U.S.A. |
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| Abstract: | Petroleum source-rock evaluations by pyrolysis are based on the concept that free hydrocarbons in rock samples are volatilized below 300°C while hydrocarbons cracked from kerogen come off at higher temperatures. The pyrolysis of pure hydrocarbons with different mineral matrices shows that free hydrocarbons containing 16 or more carbon atoms may not be evolved eblow 300°C, but at varying higher temperatures. The extent to which this occurs depends on the hydrocarbon volatility, the mineral matrix and the pyrolysis instrument design. Source-rock parameters which use the P1 (S1) peak may be not be reproducible between instruments if the rock contains appreciable amounts of high molecular weight hydrocarbons. |
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