Source-rock reservoirs geochemistry of Devonian–Mississippian mudrocks in central Oklahoma

Petroleum generation kinetics of unconventional Mississippian mudrocks in central Oklahoma, United States

“…Additionally, the post-pyrolysis rock samples showed a linear increase in reflectance values (from 0.54% to 1.27%) at higher hydrous pyrolysis temperatures. A further detailed comparison between macerals in Mississippian mudrocks and Woodford Shale can be found in previously published studies (Cardott, 2012;Atwah et al, 2020).…”

“…A recent investigation of the Mississippian mudrocks across STAK play documented mixed fine-grained lithology of clay, carbonate grains, and quartz silts, with clay content in the argillaceous quartz siltstone facies ranging between 25% and 50% within the Mississippian mudrocks (Price et al, 2020). The organic geochemistry of Mississippian mudrocks is characterized by more than 2% of total organic carbon by weight percent and enrichment in hydrogen index based on pyrolysis analysis (Atwah et al, 2020). Moreover, Mississippian mudrocks, associated oils, and oil-bearing fluid inclusion are well-known to have unique biomarker signatures such as the enrichment of extended tricyclic terpane relative to hopane in the terpane biomarker class and enrichment of cholestane relative to stigmastane and ergostane in the sterane biomarker class (Atwah et al, 2021).…”

“…Understanding petroleum generation kinetics of source rocks is crucial for defining oil and gas windows and the timing of hydrocarbon generation. In Oklahoma, the Woodford Shale has gained significant attention due to the regional-scale presence and the widespread availability of core samples (Cardott, 2012;Quan et al, 2013;Abrams and Thomas, 2020;Atwah et al, 2020). Conversely, the Mississippian mudrocks and associated organicrich facies are heterogeneously complex, and only a few organic geochemical evaluations have shown in some locations the presence of good source rock potential (Wang and Philp, 1997;Atwah et al, 2020).…”

“…In Oklahoma, the Woodford Shale has gained significant attention due to the regional-scale presence and the widespread availability of core samples (Cardott, 2012;Quan et al, 2013;Abrams and Thomas, 2020;Atwah et al, 2020). Conversely, the Mississippian mudrocks and associated organicrich facies are heterogeneously complex, and only a few organic geochemical evaluations have shown in some locations the presence of good source rock potential (Wang and Philp, 1997;Atwah et al, 2020). Kinetic parameters within the Woodford Shale have been previously investigated using hydrous pyrolysis isothermal experiments (Lewan and Ruble, 2002); however, petroleum generation kinetics remain poorly constrained for the Mississippian mudrocks, largely due to the assumption that the Mississippian rocks function as a reservoir rather than a source of hydrocarbons.…”

Fossil Invertebrate Taphonomy of the Devonian in the state of Paraná: Contributions to the Studies on Hydrocarbon Potential Linked to the Folhelho Project (LAGESED-UFRJ)

“…Dentre todas as rochas em um sistema petrolífero, esta é a mais abundante (c. 60% do registro geológico) e a única que comparece como rocha geradora, selante ou reservatório -gas shale (Bennett et al, 1991;Meléndez, 2010). Nos últimos 10 anos tem havido um expressivo aumento no reconhecimento e caracterização sedimentológica e petrofísica dos folhelhos para a avaliação de sua qualidade como rocha selante ou reservatório de gás, tanto na indústria quanto na academia (Lupoi et al, 2017;Zeng et al, 2018;Atwah et al, 2020). Contudo, o Brasil não tem acompanhado essa evolução em termos de conhecimento, quer seja do ponto de vista geral, quer seja sobre as nossas bacias sedimentares, ou de formação de pessoal qualificado (Potter, 2005).…”