Marine petroleum source rocks - download pdf or read online

By James Brooks, A. J. Fleet, Geological Society of London, Geological Society of London. Marine Studies Group, Geological Society of London. Petroleum Geochemistry Group

ISBN-10: 0632011378

ISBN-13: 9780632011377

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22 (see Cornford et al. 1983). These source rock models can help to explain a number of contentious 'threshold' values. It may be significant that workers in exploration areas such as the Gulf Coast and the Far East Questions Geological Input 43 Geochemical Input Is-there a STRUCTURE F SO rto0 I r , I HC Generated ! "[ Accumulation FIG. 23. Summary of the various stages of integration of geological and geochemical input into basin evaluation and petroleum accumulation in reservoirs. 44 Brooks et al.

1983, with permission). )-Exinite/Liptinite. stratification. This work also predicts that wellventilated basins or lakes (with active mixing processes) produce wholly oxic environments and little or no deposition of hydrocarbon source rocks. Sedimentary organic matter and kerogen Any consideration of the origin, mode of formation and definition of kerogen must be somewhat speculative. Kerogen from different parts of the earth and even from adjacent sedimentary basins varies, sometimes very widely, in composition.

In the absence of further burial an early midmature source rock would be expected to retain high levels of migratable hydrocarbons, visible in the optical microscope as a fluorescent groundmass, and to the geochemist as high carbon normalized hydrocarbon (CNH) yields or high pyrolysis $1 peaks when analysed by Rock Eval pyrolysis methods (see Espitalie et al. 1979). These thick homogeneous shales may only show oil expulsion efficiencies of 5-25% An optimum quality kerogen is required in this situation.

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Marine petroleum source rocks by James Brooks, A. J. Fleet, Geological Society of London, Geological Society of London. Marine Studies Group, Geological Society of London. Petroleum Geochemistry Group

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