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A pyrolysis technique has been developed to study hydrocarbon source rock potential by in situ visualization of kerogen transformation in a diamond anvil cell under a microscope (white and UV-light) using a CCD video monitoring system. The technique enables us to observe directly the processes and timing (or temperature) of kerogen transformation during pyrolysis in open or closed systems (either anhydrous or hydrous). It has been used to study a Green River kerogen and a lignite sample at heating rates similar to Rock-Eval pyrolysis under several pyrolysis conditions. The study has revealed: (1) the solid kerogen yields mobile oily liquids and solid residues and continues to evolve into gases. Most gases are generated later than oily liquids, probably from cracking of liquid. (2) The kerogen transformation is not significantly retarded in a closed system or at higher water pressure relative to an open system. (3) The neoformed oily liquid is immiscible with aqueous fluid at high pressure (8 kbar), but dissolves in the fluid at lower pressure (3 kbar). This confirms that the solubility of oily liquids in hydrothermal water decreases significantly with increasing pressure. The disso

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Author

Wuu-Liang Huang

Publisher

Elsevier BV

Published

1996

Language

EN

Field

Engineering (Physical Sciences)