Geochemistry in Petroleum Exploration

Waples, Douglas

doi:10.1007/978-94-009-5436-6

Cited by 297 publications

(184 citation statements)

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“…Microseepage is the result of natural generation of gas and petroleum in sedimentary basins as the result of thermal processes operating over long periods of times [Tissot and Welte, 1984;Waples, 1985;Hunt, 1996]. The microseepage is a result of devolatilization of lighter components, principally methane, from these sources and is the basis of one class of hydrocarbon exploration methods [Klusman, 1993].…”

Section: Introductionmentioning

confidence: 99%

Natural microseepage of methane to the atmosphere from the Denver‐Julesburg basin, Colorado

Klusman¹,

Jakel²

1998

J. Geophys. Res.

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Abstract. Methane fluxes were measured at locations across the Denver-Julesburg (DJ) basin of northeastern Colorado, which is in a semiarid climate. There is a potential for microseepage of thermogenically derived methane and light hydrocarbons to the atmosphere, which during drier or colder seasons may exceed the capacity for methanotrophic oxidation in the shallow soils. Triplicate measurements of methane flux in three seasons across the basin found areas of positive and negative fluxes in a patchy pattern which averaged +0.57 mg CH 4 m -2 d -1. The possibility of drier areas of the continents, which are underlain by thick sedimentary units seasonally producing positive methane fluxes to the atmosphere, represents a second-order effect in the estimation of the terrestrial sources/sinks for atmospheric methane. The chambers were operated in a static mode, shaded from the Sun, and air under the chamber mixed using an externally 28,041

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Section: Introductionmentioning

confidence: 99%

Natural microseepage of methane to the atmosphere from the Denver‐Julesburg basin, Colorado

Klusman¹,

Jakel²

1998

J. Geophys. Res.

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“…It is found that the T max value measured during the pyrolysis and the calculated PI values are closely related to thermal history of the organic matter [13,14]. The average T max values calculated for the Beypazarı, Seyitömer, Himmetoğlu, Hatıldağ, Gölpazarı and Bahçecik oil shales are 429, 423, 432, 436, 431 and 442 °C, respectively.…”

Section: Maturity Of Organic Mattermentioning

confidence: 83%

“…Bimodal distribution where the low number n-alkanes are dominant is observed in the gas chromatograms of the Himmetoğlu, Hatıldağ, Gölpazarı and Bahçecik oil shale samples. Such a distribution shows the addition of very little amounts of terrestrial organic matter with algal dominance [13,14]. Furthermore, the oleanane recorded in m/z 191 mass chromatograms indicates contribution of organic matter from angiosperms of Cretaceous and younger higher plants [15][16][17][18][19].…”

Section: Type Of Organic Mattermentioning

confidence: 99%

Organic Geochemistry, Depositional Environment and Hydrocarbon Potential of the Tertiary Oil Shale Deposits in Nw Anatolia, Turkey

Gülbay¹,

Korkmaz²

2008

Oil Shale

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“…Kerogen is normally defined as that portion of the organic matter presented in sedimentary rocks that is insoluble in ordinary inorganic and organic solvents (Waples, 1985). Each kerogen macromolecule has a molecular-weight of several thousand or more and is unique because it has patchwork structure formed by the random combination of many small molecular fragments.…”

Section: Discussionmentioning

confidence: 99%

Short-chain carboxylates in high-temperature ore fluids of W-Sn deposits in south China.

2002

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The Xihuashan, Dangping and Piaotang deposits in the Jiangxi Province, south China can be considered as typical high-temperature hydrothermal quartz vein-type W-Sn mineralization, that is temporally and spatially related to Mesozoic S-type granite. Microthermometric studies of fluid inclusions in various minerals from these deposits were conducted to obtain homogenization temperature and salinity data. Major organic and inorganic aqueous components of the fluid inclusions were extracted by a crush-leaching, and concentrations of short-chain carboxylate (formate, acetate, propionate, oxalate), fluoride, chloride and sulfate anions in the leachates were determined using ion chromatography. The results indicate the presence of formate and acetate as well as minor amounts of oxalate and propionate in leachates, and the dominance of formate over other carboxylates. The molar ratio of acetate to formate appears to be a potential indicator of the redox state for the ore fluid system. Oxygen and hydrogen isotopic data show that inclusion water in quartz is mainly magmatic in origin. It is postulated that the dissolved carboxylate anions in the ore fluids for the deposits probably were generated by the breakdown of kerogen in "primitive sedimentary rocks" during the formation of S-type granites. The possibility of inorganic synthesis of the carboxylate species in a C-H-O system can not be excluded.organic complexes including metal-carboxylate complexes in hydrothermal solutions. Most studies, up to the present time, that looked at the role of organic matter in ore-formation were mainly focused on ore deposits formed at temperatures less than 200-250°C (Giordano, 1985200-250°C (Giordano, , 1994 and related to sedimentation and diagenesis, or those occurring in sedimentary rocks (e.g., Mississippi Valley type and red-bed type base-metal deposits). Lewan and Pittman (1994) pointed out the importance of identifying and quantifying organic acids in fluid inclusions of ore and related gangue minerals in developing and testing models for oreforming systems. Analysis of the aqueous organic components of fluid inclusions in ore and gangue minerals is the only direct method of providing

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Geochemistry in Petroleum Exploration

Cited by 297 publications

References 0 publications

Natural microseepage of methane to the atmosphere from the Denver‐Julesburg basin, Colorado

Natural microseepage of methane to the atmosphere from the Denver‐Julesburg basin, Colorado

Organic Geochemistry, Depositional Environment and Hydrocarbon Potential of the Tertiary Oil Shale Deposits in Nw Anatolia, Turkey

Short-chain carboxylates in high-temperature ore fluids of W-Sn deposits in south China.

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