scispace - formally typeset
Search or ask a question
Author

G. J. Demaison

Bio: G. J. Demaison is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 126 citations.

Papers
More filters
Journal Article
TL;DR: In this paper, the composition chimique and the maturation of huiles provenant du Bassin Adriatique have been investigated in order to find correlations entre the nature of hhiles and les roches meres.
Abstract: Etude de la composition chimique et de la maturation d'huiles provenant du Bassin Adriatique afin d'etablir des correlations entre la nature des huiles et les roches meres. L'etude experimentale est realisee en combinant l'utilisation de marqueurs biologiques et l'analyse des isotopes stables

129 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this article, the C35-homohopane index decreases with increasing API gravity and thermal maturity of related oils from the Monterey Formation, offshore California, showing that identical heating conditions result in different homopane C-22 epimer ratios.

677 citations

Journal ArticleDOI
TL;DR: In this paper, two new rearranged hopanoid hydrocarbons have been isolated from a Prudhoe Bay crude, Alaska, using X-ray crystallography, and the structures of these hopanes are consistent with an origin by catalytic rearrangement from hopenes during early diagenesis.

287 citations

Journal ArticleDOI
TL;DR: In this paper, the authors show that the marine Mississippian Barnett Shale is the primary source rock for petroleum in the Fort Worth Basin, although contributions from other sources are possible.
Abstract: Detailed biomarker and light hydrocarbon geochemistry confirm that the marine Mississippian Barnett Shale is the primary source rock for petroleum in the Fort Worth Basin, north-central Texas, although contributions from other sources are possible. Biomarker data indicate that the main oil-generating Barnett Shale facies is marine and was deposited under dysoxic, strong upwelling, normal salinity conditions. The analysis of two outcrop samples and cuttings from seven wells indicates variability in the Barnett Shale organic facies and a possibility of other oil subfamilies being present. Light hydrocarbon analyses reveal significant terrigenous-sourced condensate input to some reservoirs, resulting in terrigenous and mixed marine-terrigenous light hydrocarbon signatures for many oils. The light hydrocarbon data suggest a secondary, condensate-generating source facies containing terrigenous or mixed terrigenous-marine organic matter. This indication of a secondary source rock that is not revealed by biomarker analysis emphasizes the importance of integrating biomarker and light hydrocarbon data to define petroleum source rocks. Gases in the Fort Worth Basin are thermogenic in origin and appear to be cogenerated with oil from the Barnett Shale, although some gas may also originate by oil cracking. Isotope data indicate minor contribution of biogenic gas. Except for reservoirs in the Pennsylvanian Bend Group, which contain gases spanning the complete range of observed maturities, the gases appear to be stratigraphically segregated, younger reservoirs contain less mature gas, and older reservoirs contain more mature gas. We cannot rule out the possibility that other source units within the Fort Worth Basin, such as the Smithwick Shale, are locally important petroleum sources.

245 citations

Journal ArticleDOI
TL;DR: In this article, the chemical speciation of sulfur in heavy petroleums, petroleum source rock extracts, and source rock pyrolysis products was studied using X-ray absorption near-edge structure (XANES) spectroscopy.

216 citations

Journal ArticleDOI
TL;DR: In this paper, the C-25 methyl group from the extended 17α,21β(H)-hopanes (hopanes) generates 25-norhopanes in crude oils from the West Siberia and San Joaquin basins.

172 citations