Laboratory-simulated thermal maturation of different types of sediments from the Williston Basin, North America—effects on the production rates, the isotopic and organo-geochemical composition of various pyrolysis products

Arneth, J.-D.; Matzigkeit, U.

doi:10.1016/0168-9622(86)90022-9

Cited by 21 publications

(11 citation statements)

References 18 publications

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“…10) and, therefore, with distance from Rote Fäule, argues for the preferential release of 12 C-rich organic constituents during oxidative alteration of organic matter as indicated by the organic geochemistry data discussed previously. Consequently, the residual organic matter is enriched in 13 C (Arneth and Matzigkeit 1986). The results are in agreement with the carbon isotopic trend obtained from Kupferschiefer profiles of the Richelsdorf Hills in Germany (Bechtel and Püttmann 1991).…”

Section: Carbon Isotopic Analysis Of Organic Mattersupporting

confidence: 89%

Geochemical and isotopic composition of organic matter in the Kupferschiefer of the Polish Zechstein basin: relation to maturity and base metal mineralization

Bechtel¹,

Gratzer²,

Püttmann

et al. 2000

International Journal of Earth Sciences

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Drill core samples from the Kupferschiefer of Poland were collected throughout the Zechstein basin. The samples included oxidized Kupferschiefer from Rote Fäule zones, adjacent Cu-mineralized Kupferschiefer of southwestern Poland, and drill cores from the central and northern parts of the Zechstein basin. The Kupferschiefer samples reflect differences in base metal mineralization and in burial depth (630±5067 m). The organic matter of the Kupferschiefer is characterized by Rock-Eval and GC-MS analyses. Classification of kerogen by hydrogen and oxygen indices (HI, OI), correlations of T max vs the present depth of the Kupferschiefer, soluble organic matter (SOM) yields, and relative proportions of saturated and aromatic hydrocarbons of the SOM provide evidence for an oxidative alteration of organic matter in highly mineralized Kupferschiefer samples near the Rote Fäule zones. This is confirmed by differences in the composition of the saturated and aromatic hydrocarbon fractions of the soluble organic matter: Saturated hydrocarbons from Rote Fäule samples are dominated by short-chain n-alkanes and higher abundances of pristane and phytane relative to heptadecane (n-C17) and octadecane (n-C18), respectively, compared with samples more distant to the Rote Fäule zone. Compositional changes of the aromatic hydrocarbon fractions with decreasing distance to that zone are characterized by the occurrence of polycyclic aromatic hydrocarbons and elevated ratios of phenanthrene to methylphenanthrenes that are attributed to demethylation reactions and resulted in a decrease of the methylphenanthrene index (MPI 1). Kupferschiefer samples from the barren zone of the Polish Basin do not show these alteration patterns. The observed variations in organic matter composition with burial depth are consistent with changes due to increasing thermal maturation. Maturity assessment is achieved from MPI 1 and the methyldibenzothiophene ratio (MDR). From the relationship between the maturity of organic matter in terms of vitrinite reflectance values and depth of the Kupferschiefer strata, a continuous increase in reflectance of vitrinite is obtained within the Polish Basin. The alteration pattern of organic matter related to base metal mineralization of the Kupferschiefer corresponds to changes in the isotopic composition of organic carbon and calcite. Kerogen within, or close to, Rote Fäule zone is enriched in 13 C caused by the preferential release of isotopically light organic compounds through progressive degradation of organic matter. The opposite tendency towards lower d 13 C and d 18 O values of calcite provides evidence for isotopic exchange between carbonate and the oxidizing, ore-bearing solutions and for organic matter remineralization. In contrast, organic matter and calcite from the Kupferschiefer do not show regular trends in d 13 C with increasing thermal maturation.

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Section: Carbon Isotopic Analysis Of Organic Mattersupporting

confidence: 89%

Geochemical and isotopic composition of organic matter in the Kupferschiefer of the Polish Zechstein basin: relation to maturity and base metal mineralization

Bechtel¹,

Gratzer²,

Püttmann

et al. 2000

International Journal of Earth Sciences

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“…The 3 13 C results in Table 3 underscore the well-known isotopic disproportionation of sedimentary organic carbon during thermal maturation into 13 C-depleted low-molecular hydrocarbon compounds and relatively 13 C-enriched remaining kerogen, as documented from anhydrous pyrolysis (Sackett, 1978;Peters et al, 1981;Arneth and Matzigkeit, 1986; reviewed by Whiticar, 1996), hydrous pyrolysis (Andresen et al, 1995;E li l 1995) pyrolysis of a Green River Fm. shale sample similar to the one used in this study (Collister et al, 1992).…”

Section: Methodsmentioning

confidence: 95%

Experimental controls on D/H and 13 C/ 12 C ratios of kerogen, bitumen and oil during hydrous pyrolysis

Schimmelmann

Boudou

Lewan

et al. 2001

Organic Geochemistry

127

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Large isotopic transfers between water-derived hydrogen and organic hydrogen occurred during hydrous pyrolysis experiments of immature source rocks, in spite of only small changes in organic 13 C/ 12 C. Experiments at 330'C over 72 h using chips or powder containing kerogen types I and III identify the rock/water ratio as a main factor affecting ASD for water and organic hydrogen. Our data suggest that larger rock permeability and smaller rock grain size increase the H-isotopic transfer between water-derived hydrogen and thermally maturing organic matter. Increasing hydrostatic pressure may have a similar effect, but the evidence remains inconclusive.

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“…Following artificial pyrolysis in the laboratory, residual kerogen type III and other types of organic matter were 13 C-depleted by 1.9-3.0& relative to organic pyrolysates (Arneth and Matzigkeit, 1986). The same authors observed a decreasing d 13 C trend for a type III kerogen with increasing thermal stress.…”

Section: C Shifts In Thermally Maturing Kerogenmentioning

confidence: 90%

Dike intrusions into bituminous coal, Illinois Basin: H, C, N, O isotopic responses to rapid and brief heating

Schimmelmann

Mastalerz

Gao

et al. 2009

Geochimica et Cosmochimica Acta

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Laboratory-simulated thermal maturation of different types of sediments from the Williston Basin, North America—effects on the production rates, the isotopic and organo-geochemical composition of various pyrolysis products

Cited by 21 publications

References 18 publications

Geochemical and isotopic composition of organic matter in the Kupferschiefer of the Polish Zechstein basin: relation to maturity and base metal mineralization

Geochemical and isotopic composition of organic matter in the Kupferschiefer of the Polish Zechstein basin: relation to maturity and base metal mineralization

Experimental controls on D/H and 13 C/ 12 C ratios of kerogen, bitumen and oil during hydrous pyrolysis

Dike intrusions into bituminous coal, Illinois Basin: H, C, N, O isotopic responses to rapid and brief heating

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