Correlation of Organic Parameters Derived from Elemental Analysis and Programmed Pyrolysis of Kerogen
Published:January 01, 1985
Laura J. Crossey, E. Sven Hagen, Ronald C. Surdam, Thomas W. Lapoint, 1985. "Correlation of Organic Parameters Derived from Elemental Analysis and Programmed Pyrolysis of Kerogen", Roles of Organic Matter in Sediment Diagenesis, Donald L. Gautier
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The quality, quantity, type, and level of hydrocarbon maturation of various organic-rich rock samples were evaluated by two different techniques: elemental analysis and programmed pyrolysis. Eighty samples varying in both total organic carbon (0.5-75 wt% OC) and kerogen type were analyzed. Effects of the mineral matrix on measured geochemical parameters were examined by analysis of synthetic mixtures of separated kerogen (Types I, II, and III) and mineral matter (bentonite and illite at various percentages).
Statistical analyses were performed on bulk rock samples, separated kerogen, and bitumen-extracted kerogen. Analyses include population descriptions, correlations, and stepwise multiple regression. Data parameters include: bulk rock Hydrogen Index (HI), sep-arated kerogen HI, bitumen-extracted kerogen HI, atomic H/C and O/C (bitumen-extracted kerogen), and % OC in bulk, separated, and bitumen-extracted samples.
Results from a wide variety of hydrocarbon source rocks indicate that programmed pyrolysis can be used to predict atomic H/C. Although the variance of both methods is similar, the HI values derived from bulk rock samples consistently underestimate those derived from bitumen-extracted samples. Both measures are highly correlated (r = 0.87, P = 0.001). Guidelines for the practical application of bulk rock pyrolysis data to source rock evaluation studies are presented.
In summary, standard pyrolysis techniques yield information which can be used for rapid, accurate appraisal of the quality, maturity, and type of organic material contained within a wide variety of organic-rich rocks.
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Roles of Organic Matter in Sediment Diagenesis
This volume is the direct result of an SEPM Research Conference held in October 1983 at Lost Valley Ranch, Colorado. The goal of the volume is to bring attention of the sedimentological community the importance of interaction of organic compounds with the inorganic sedimentary system and the degree to which organic compounds drive diagenetic systems. This volume comprises 16 reports illustrative of the scope and direction of current research in sedimentological and geochemical studies of organic/inorganic interaction.