Enhanced carbon dioxide release and other possible effects of clay minerals during thermal evaluation of sediments

Z. Aizenshtat*, I. Miloslavsky, L. Heller Kallai

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Thermal evaluation of potential source rocks (PSR) include measurements of CO2 evolved (>400°C) designated as IO (Oxygen Index). For whole rock analysis this index frequently exceeds the value derived from organically bonded oxygen. The surplus of CO2 stems mainly from the reaction of carbonates with active acidic volatiles released from the associated clays. The magnitude of this effect is specific for every clay mineral, but for any particular mineral assemblage it correlates directly with the clay/carbonate ratio. The largest discrepancy between IO values and organically bonded oxygen occurs when O.M. is low (ca. 0.5-1%), clays dominate and sufficient carbonates are present to react. Clay minerals and kerogen probably do not react, as such. However, the active volatiles released upon heating attack even before depolymerization. The liquid monomers produced then can react with both clay minerals and their volatiles. These interactions could result in changes of the IH factor (Hydrogen Index), as well as the distribution of products.

Original languageEnglish
Pages (from-to)25
Number of pages1
JournalAmerican Chemical Society, Division of Petroleum Chemistry, Preprints
Volume34
Issue number1
StatePublished - Mar 1989
EventSymposium on Comparative Studies of Various Oil Shales - Dallas, TX, USA
Duration: 9 Apr 198914 Apr 1989

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