Behavior of lipid compounds on laboratory heating of a Recent sediment.

Kawamura, Kimitaka; Ishiwatari, Ryoshi

doi:10.2343/geochemj.19.113

Cited by 14 publications

(6 citation statements)

References 43 publications

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“…Kawamura and Ishiwatari (1985) found that long chain fatty acids (C12-C32) content of sediment samples heated at 200-325°C for 24h did not decrease. Suzuki and Taguchi (1982) reported that authentic palmitic (C16) and stearic (C18) acids remained unchanged when they were heated alone at 400'C for 20h.…”

Section: Fates Of Organic Acidsmentioning

confidence: 90%

Volatile organic acids generated from kerogen during laboratory heating.

et al. 1986

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Low molecular weight organic acids were studied in the course of pyrolysis experiments (200-400°C, 2-1,000h) of kerogen (Green River Formation and Monterey Formation) with and without the presence of water and minerals (montmorillonite, illite and calcite). C1-C10 aliphatic acids and benzoic acid were identified in the pyrolysis products of kerogen. Their distribution. is characterized by a dominance of acetic acid followed by formic and propionic acids with an even/odd preference in the range of C4-CIO

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Section: Fates Of Organic Acidsmentioning

confidence: 90%

Volatile organic acids generated from kerogen during laboratory heating.

et al. 1986

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“…PROPIONIC BUTYRIC + VALE RIC aliphatic acids with 9 to 30 carbons have been generated from Lake Biwa surface sediments in laboratory heating experiments (Kawamura and Ishiwatari 1985b). Isothermal experiments conducted for 24-h durations generate a steady increase of these acids from 129°C to a maximum at 279 DC, which is followed by a decrease at 300 and 325°C.…”

Section: ~W~--~----~~----~----~----~----~----~~----~--~5~owt%mentioning

confidence: 99%

“…Straight-chain acids with 1 to 32 carbon atoms are the most common acids of this type that are generated from experimentally heated sedimentary organic matter. C12 to C32 acids of this type in surface sediments of Lake Biwa have been monitored through a series of isothermal heating experiments at temperatures from 68 to 325°C for 24-h durations (Kawamura and Ishiwatari 1985b).…”

Section: Saturated Acyclic Aliphatic Monocarboxylic Acidsmentioning

confidence: 99%

“…Their experiments involved isothermally heating wet surface sediments from Lake Biwa in borosilicate glass tubes at 65 and 83°C for 24 to 5952 h (Kawamura and Ishiwatari 1985a), 120 to 198°C for 48 h (Kawamura and Ishiwatari 1981), and 68 to 325°C for 24h (Kawamura and Ishiwatari 1985b). Organic acids with 12 through 32 carbon atoms (i.e., C12-C32) extracted from the wet sediments showed no significant increase in concentration after being heated at 83°C for 5952 h, 120°C for 48 h, and 129°C for 24 h. A small but detectable increase in acid concentrations was first observed after heating at 140°C for 24 h, and a 50% increase relative to the concentration of the unheated sample required heating temperatures of 300 and 325°C for 24 h.…”

Section: Time and Temperature Conditionsmentioning

confidence: 99%

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Organic Acids from Petroleum Source Rocks

Lewan

Fisher²

1994

Organic Acids in Geological Processes

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SummaryThe vastness and dynamics of sedimentary basins make it difficult to assess organic acid generation from petroleum source rocks on the basis of the limited subsurface data currently available. An alternative approach involves simulating the natural process in laboratory pyrolysis experiments that maintain a liquid-water phase, utilize whole rock, avoid extreme temperatures, and minimize reactor-wall effects. Appropriately conducted laboratory pyrolysis experiments show that saturated acyclic monocarboxylic acids are the dominant organic acids generated, that Cz-C5 monocarboxylic acids dominate the aqueous phase assemblages, and that acetic acid (C2) is typically the dominant aqueous organic acid. Low activation energies derived from laboratory pyrolysis experiments indicate that these organic acids are retained in sedimentary organic matter by weak noncovalent bonds. Thus, the organic acid potential of a source rock is largely dependent on the amount of Cz-Cs monocarboxylic acids assimilated by noncovalent bonds into sedimentary organic matter during its early development into kerogen. Significant quantities of these acids may be released from petroleum source rocks by diffusion during early diagenesis. However, the sluggishness of this diffusion process is only likely to cause local enhancement of porosity within a source rock and in rocks immediately adjacent to it. Release of the remaining organic acids is most likely to occur during the expulsion of petroleum from a source rock. Dissolved organic acids in the expelled petroleum will redistribute themselves within the associated formation waters as the migrating or entrapped petroleum cools, degasses, or encounters lower salinity waters. As a result, enhanced porosity may occur within carrier beds during secondary petroleum migration or within reservoirs during or after petroleum entrapment.

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“…Biomarkers preserved in both sample types appear to be useful indicators for identification of an organic-matter (OM) origin Nádudvari et al, 2018). For example, n-fatty acids can serve as useful indicators of OM origin because they are precursors of aliphatic hydrocarbons, which represent some of the main components of petroleum and coal bitumen, which in turn forms via decarboxylation and reduction reactions (Cooper and Bray, 1963;Kawamura and Ishiwatari, 1985;Dong et al, 1993). In addition, n-fatty acids, which are present in recent plant tissues, may be important components of OM involving all types of kerogen.…”

Section: Introductionmentioning

confidence: 99%