Geochemical conditions of oil and gas potential of the South Caspian basin on the basis of pyrolytic studies of mud volcanoes
01 Jul 2019-Vol. 98, pp 02007
TL;DR: In this paper, the results of geochemical studies with products of mud volcanoes conducted for a purpose of evaluating the generative potential of the South-Caspian basin were provided.
Abstract: This paper provides the results of geochemical studies with products of mud volcanoes conducted for a purpose of evaluating the generative potential of the South-Caspian basin. The kerogen types have been identified for different stratigraphic intervals and stages of the organic matter (OM) thermal maturity have been determined. A correlation has been established between the generative potential and the basin deposition and subsidence rate.
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TL;DR: In this article, the authors used pyrolysis to rapidly evaluate the petroleum-generative potential and thermal maturity of rocks and found that most coals showed high S2/S3 (>5) and low HI values (< 300 mg HC/g TOC.
Abstract: Rock-Eval pyrolysis is used to rapidly evaluate the petroleum-generative potential and thermal maturity of rocks. Accurate conclusions require programs every 30-60 ft (9-18 m), understanding of interpretive pitfalls, and supporting data, such as visual kerogen, vitrinite reflectance, and elemental analyses. The generative potential of coals is commonly overestimated by pyrolysis and is best determined by elemental analysis and organic petrography. Most coals show high S2/S3 (>5) and low HI values (< 300 mg HC/g TOC). Migrated oil and mud additives, which alter Rock-Eval data, can sometimes be removed by special processing. For immature rocks, bimodal S2 peaks and PI values over 0.2 indicate contamination. Pyrolysis downgrades organic-poor, clay-rich rocks, which show lower HI and higher Tmax values than isolated kerogen because of adsorption of pyrolyzate on the clays. Tmax values for small S2 peaks (< 0.2 mg HC/g TOC) are unreliable. Tmax is affected by maturation, organic matter type, contamination, and the mineral matrix. S3 is sensitive to inorganic and adsorbed carbon dioxide, and to instrumentation problems. Acidification of carbonate-rich samples and proper maintenance improves S3 measurement. Constant sample weights (100 mg) are recommended. Below a threshold weight, Tmax increases by up to 10°C, and other parameters decrease. Organic-rich samples, which overload the detector, can be diluted with carbonate. Detector linearity is determined by pyrolyzing various weights of an organic-rich rock.
2,121 citations
TL;DR: In this article, a pyrolyse type Rock-Eval sur kerogenes, avec determination du carbone residuel, permet par contre, a partir d'une hypothese raisonnable, de calculer les hydrocarbures produits.
Abstract: L'evaluation quantitative des produits mobiles formes lors de l'evolution geochimique de la matiere organique est necessaire parce qu'on ne peut jamais retrouver ces produits en place dans. la roche ou ils ont pris naissance. Ils ont, en effet, pu migrer durant l'histoire geologique, et de toute maniere une fraction, importante et non connue, se perd lors de la prise des echantillons puis de leur conservation avant analyse. La connaissance de l'analyse d'un etat E et d'un etat plus evolue E' ne suffit pas pour reconstituer les quantites de produits formes. La pyrolyse type Rock-Eval sur kerogenes, avec determination du carbone residuel, permet par contre, a partir d'une hypothese raisonnable, de calculer les hydrocarbures produits. L'analyse elementaire permet d'y ajouter CO2, H2O, H2S et N2 (consideres comme seuls produits a cote des hydrocarbures). Une analyse chromatographique sommaire supplementaire permet d'estimer la composition globale des hydrocarbures. Dans le cas des roches, on propose des techniques de correction de l'effet de matrice pratiquement utilisables et qui permettent de retrouver les resultats precedents, au prix d'une incertitude accrue.
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TL;DR: In this paper, the indispensable functional relationship between large-scale hydrocarbon trap saturation and limited space overflow-injection hydrogeological processes outside the regional action of elision and artesian mechanisms is described.
Abstract: The paper describes the indispensable functional relationship between large-scale hydrocarbon trap saturation and limited space overflow-injection hydrogeological processes outside the regional action of elision and artesian mechanisms. We propose a set of qualitative criteria and quantitative indicators of oil and gas potential, making it possible to minimize the risks of geological exploration and production and create individual forecast zones and priority areas of oil and gas accumulation.
18 citations