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Thermal maturation of organic matter (OM) and the ensuing generation of oil, gas and organic rich residues appear to be the major factor controlling the development, the size and the abundance of OM pores in marine organic-rich mudstones (Katz and Arango, 2018; Ko et al., 2018). However, different formations containing a similar type II OM can exhibit different OM pore evolution models indicating that other factors, such as maceral composition, may influence the evolution of OM porosity during burial (Ko et al., 2018). To investigate how the chemical properties of the total particulate OM assemblage affect the evolution of porosity during thermal diagenesis of organic-rich marine mudstones, laboratory gold-tube anhydrous confined thermal maturation (325°C-470°C for 72h) was applied on immature Kimmeridge Clay (KCF) mudstones (Yorkshire, UK) which contain a type II oil-prone kerogen (HI: 418 to 617 mg HC/g TOC). The evolution of pore volume and pore size distribution was calculated using nitrogen adsorption measurement and evaluated as a function of OM properties: palynofacies analysis, Rock Eval 6 pyrolysis, the amount and the composition of oil and gas generated during maturation (GC-TCD and GC/MS analysis). The addressed question is to know how slight differences in the relative proportion of individual OM components throughout a same formation influence OM chemical transformations and pore development during thermal maturation of organic-rich marine mudstones.

Influence of Organic Matter Properties on Porosity of Kimmeridge Clay Source Rocks During Laboratory Thermal Maturation