Geochemical characterization of source rocks and oils from the eastern part of the Precaspian and Pre-Uralian Basins (Kazakhstan): Palaeoenvironmental and palaeothermal interpretation

Izart, Alain; Joltaev, Geroi; Hautevelle, Yann; Montchowui, Élie; Suárez‐Ruíz, Isabel

doi:10.1016/j.orggeochem.2009.11.003

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…Average TOC values 2-3.5% are documented for the sediments over Tengiz carbonate platform (Pairazian 1999). Lower Permian pre-salt sedimentary successions contain Type II organic matter with TOC up to 2.5% (Yensepbayev et al 2009;Pairazian 1999). Most authors agree that post-salt reservoirs are charged by pre-salt Upper palaeozoic source rocks.…”

Section: Source Rock Evaluationmentioning

confidence: 99%

“…Recent biomarker studies and geochemical correlations between oils, reservoirs and source rocks in the eastern and southern edges of the PCB have linked Palaeozoic source rocks with the post-salt Precaspian petroleum system (Gurgey Warner et al 2007;Yensepbayev et al 2009Yensepbayev et al , 2002Peters et al 2005), indicating an important role for primary vertical migration from pre-salt to post-salt strata via welded regions. Despite the long-term study into the structure and formation of PCB salt structures, questions related to the mechanisms and pathways of hydrocarbon migration and accumulation in the post-salt complex remain debatable.…”

Section: Source Rock Evaluationmentioning

confidence: 99%

“…In Yensepbayev et al (2009), earlier study based on Rock-Eval pyrolysis and molecular analysis of a large number of source rock samples from the Eastern Precaspian and Pre-Uralian Basins (Republic of Kazakhstan) determined the following, Early and Mid-Carboniferous source rocks are dominated by algal kerogen Type II, while the mixed kerogen Type II/III is established for predominantly marine siliciclastic Early Permian source rocks. The identified feature is presumably linked to the increasing of collisional processes during the Early Permian and contribution of terrestrial plants.…”

Section: Source Rock Evaluationmentioning

confidence: 99%

“…The Middle Carboniferous source rocks with predominant type II kerogen (Yensepbayev et al 2009;Gurgey 2002;Ulmishek 2001) entered the main oil zone during the Late Triassic and Jurassic and may have been a source of HC for Mesozoic structural traps formed due to salt tectonics. The deepest Devonian source rocks are predominantly in the zone of wet gas generation (1.3-2%R o ).…”

Section: Thermal Modellingmentioning

confidence: 99%

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Prospect evaluation based on integrated petroleum system analysis: Block E case study, south-eastern edge of Precaspian Basin (Kazakhstan)

Zhanserkeyeva

Kassenov

2022

J Petrol Explor Prod Technol

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Generative potential and thermal maturity for Upper Palaeozoic source rocks from the south-eastern edge of Precaspian Basin were determined using Rock–Eval. A high hydrocarbon source rock generative potential and high degree of thermal maturity for the Lower Permian, Mid-Carboniferous strata have been revealed based on 39 rock samples. TOC values of 0.4–5.5% have been obtained for mature source rocks. Integrated geochemical analysis determined from Rock–Eval studies combined with 1D basin modelling was utilized in order to reconstruct thermal evolution for the Upper Palaeozoic source rocks. Calibrated 1D models for three wells had been constructed to understand petroleum system. For two deep exploration wells (Nur-1 and Tassym SE-1), which penetrated pre-salt strata at the depths of 5.7 and 7 km, respectively, the impact of salt diapirism on timing of maturation was modelled. Type II kerogen was used, which is based on previous palaeogeographic studies. The stratigraphic framework and major stages of geodynamic evolution were analysed. Salt-related structural traps in post-salt strata have been described based on 3D seismic data, and additional intra-salt sediment packages have been delineated. Discovered producing oil fields in the Upper Triassic and Jurassic–Cretaceous stratigraphic sections are mainly confined to the four-way dip structural closures above the steep flanks of salt structures. Based on burial and thermal modelling, the maturation and generation behaviour of kerogen Type II below salt-related minibasins and close to thick salt diapirs were inferred. For Lower Permian SR with type II kerogen, the generation peak (maturity over 50%) occurs in Middle to Late Jurassic. For predominantly carbonate and terrigenous-carbonate Mid-Carboniferous marine SR, generation peak occurs earlier below salt withdrawal minibasins. Implications for deeper hydrocarbon prospectivity were made for the study area, and methodology for evaluating hydrocarbon potential adopting 1D basin modelling technique and geochemical data is presented.

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Section: Source Rock Evaluationmentioning

confidence: 99%

Section: Source Rock Evaluationmentioning

confidence: 99%

Section: Source Rock Evaluationmentioning

confidence: 99%

Section: Thermal Modellingmentioning

confidence: 99%

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Prospect evaluation based on integrated petroleum system analysis: Block E case study, south-eastern edge of Precaspian Basin (Kazakhstan)

Zhanserkeyeva

Kassenov

2022

J Petrol Explor Prod Technol

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“…Несмотря на более вековую историю геологического изучения восточного обрамления Прикаспийского впадины, выделение нефтегазоматеринских горизонтов и их генерационно-эмиграционный потенциал слабо изучен. Это связано со сложной историей геодинамического развития Прикаспийского осадочного бассейна (ПОБ) и неравномерной геолого-геофизической изученностью глубоко погруженных горизонтов [3][4][5][6][7][8][9]. Изучение генерационно-эмиграционного потенциала различных литолого-стратиграфических комплексов палеозоя, вскрытых глубокими скважинами, позволяет определить объем, количество и качество исходного органического вещества нефтематеринских толщ палеозоя восточного борта Прикаспийского осадочного бассейна.…”

Section: Potential Source Rocks Evaluation For the Pre-salt Complex O...unclassified

Potential Source Rocks Evaluation for the Pre-Salt Complex of the Eastern Edge of Precaspian Basin

ZHANSERKEYEVA¹

2022

NiG

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Through basin analysis, the major tectonic stages and paleogeographic conditions of the formation of potential oil and gas source rocks of the subsalt complex of the eastern side zone of the Precaspian basin are considered. Prediction and localization of potential source rocks is critical for the Precaspian petroleum system understanding, both during petroleum play assessment at the prospecting and exploration stages. The generation and emigration potential of the oil and gas basin is determined not only by the concentration of the initial organic matter in the rock, but also by the type of kerogen. Based on Rock-Eval studies and comparative analysis with published biomarker data, the generation potential, genetic type and thermal maturity are analyzed depending on the age and structural relatedness of potential source rocks. A high generation potential has been established for the Lower Permian deposits, the occurrence of multiple generation foci controlled by the type and concentration of organic matter is predicted, which led to the formation of specific reservoirs of the "akzharite" type. The generation potential of the Visean-Bashkirian deposits is poor to average, catagenetic unconformities have been established within KT-II, KT-I, which indicates erosions, the total organic carbon (TOC) is 0.1-4%, the hydrogen index increases with depth, for samples enriched with TOC and with a content of S2 > 1, type II kerogen has been established, which it is an indicator of reducing marine environment. 2D basin modeling was performed in order to reconstruct the thermal evolution of potential source rocks and their thermal maturity and transformation ratio were modelled to determine the regional characteristics of hydrocarbon generation and migration. It is assumed that the formation and distribution area of the primary source rocks is associated with reducing conditions of the deep-sea shelf and continental slope and intensive subsidence in the Late Devonian-Lower Permian times. Conducting a comprehensive analysis of paleogeographic and paleotectonic conditions for the formation of potential source rocks is of key importance in the seismic interpretation and reconstruction of thermal history. 2D basin modeling was performed in order to reconstruct the thermal history of potential oil-producing strata and the degree of catagenetic maturity and the kerogen maturity index were estimated to determine the regional characteristics of hydrocarbon generation and migration.

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Effect of the progressive precipitation of petroleum asphaltenes on the Re–Os radioisotope system

Mahdaoui¹,

Reisberg²,

Michels³

et al. 2013

Chemical Geology

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Geochemical characterization of source rocks and oils from the eastern part of the Precaspian and Pre-Uralian Basins (Kazakhstan): Palaeoenvironmental and palaeothermal interpretation

Cited by 10 publications

References 17 publications

Prospect evaluation based on integrated petroleum system analysis: Block E case study, south-eastern edge of Precaspian Basin (Kazakhstan)

Prospect evaluation based on integrated petroleum system analysis: Block E case study, south-eastern edge of Precaspian Basin (Kazakhstan)

Potential Source Rocks Evaluation for the Pre-Salt Complex of the Eastern Edge of Precaspian Basin

Effect of the progressive precipitation of petroleum asphaltenes on the Re–Os radioisotope system

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