Methylphenanthrene maturity index of marine source rock extracts and crude oils from the Maracaibo Basin

Cassani, Fernando; Gallango, O.; Talukdar, Suhas C.; Vallejos, Carlos; Ehrmann, Ursula

doi:10.1016/0146-6380(88)90027-7

Cited by 108 publications

(26 citation statements)

References 7 publications

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“…Regarding the methylphenanthrene ratio (MPR or ratio of 2-to 1-isomer), considered as a practical indicator of maturity level for marine organic material at vitrinite reflectances beyond 0.9% [59,60], the sampled oils showed very similar MPR values ranging from 1.1 to 1.27 (Table 4). This would denote a maturation level equivalent to about 1% after the peak oil generation.…”

Section: Thermal Maturitymentioning

confidence: 99%

Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela)

et al. 2020

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The organic geochemical features of 30 sampled oils from the northern Bolivar Coastal Complex (Lake Maracaibo Basin, NW Venezuela) were examined by combining carbon isotope, classical biomarker, and extended diamondoid analyses to clarify source facies and to assess the thermal maturity and extent of biodegradation of the oils analyzed. In this work, oils are understood as a mixture of two episodes of petroleum generation from the La Luna Formation: a paleobiodegraded oil pulse during Paleogene times and a late pulse having a higher maturity in the post-Oligocene. For the oil samples analyzed, results revealed a mixing composed of different proportions of almost a terrestrially derived siliciclastic-sourced and a purely marine carbonate-sourced oil pulse. Moreover, two main groups of oils were identified by means of hierarchical cluster analysis. Finally, inter- and intrafield variations in the extent of biodegradation were also assessed using two classification schemes (Peters and Moldowan, and Manco scales).

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Section: Thermal Maturitymentioning

confidence: 99%

Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela)

et al. 2020

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“…Additionally, abnormally high concentrations of thermally labile trimethylnaphthalenes 1,4,6‐, + 1,3,5‐TMN (Fig. 4b) showing a declining depth trend indicate the methyl‐shift process occurring during aromatic hydrocarbon maturation (Radke et al ., 1982b; Radke et al ., 1986; Cassani et al ., 1988; Radke, 1988). Such a thermal conversion mechanism also explains the increasing TeNR‐depth trend occurring in the deep section (Fig.…”

Section: Discussionmentioning

confidence: 99%

Quaternary exhumation history of the NE Tibetan Plateau revealed by peculiar distributions of polycyclic aromatic hydrocarbons in core extracts from the Sanhu depression, eastern Qaidam basin

Yin

Huang

2020

J Quaternary Science

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Reworked organic matter (ROM) has been frequently encountered in fresh organic matter (FOM) in young sedimentary basins. Our study reports an ROM-dominated sequence from 21 borehole cores of the Late Pliocene-Quaternary strata in the Sanhu depression of the eastern Qaidam basin in northwestern China. Reworked organic matter occurrence is confirmed by Rock-Eval pyrolysis results, high Ro values, and reversed polyaromatic hydrocarbon (PAH) maturity trends showing elevated maturities. Rock-source correlation using molecular fingerprints of biomarkers shows ROM was derived from Jurassic freshwater lacustrine source rocks dominated by terrestrial input, contrasting the immature Quaternary FOM developed in anoxic, saline lacustrine facies. The ROM provenance is traced northward to the southern Qilian Mountains. Maximum burial depths of ROM prior to erosion have been inferred by a burial depth-Rc (calculated vitrinite reflectance) correlation. Two chronological boundaries (1.83 Ma and 3.12 Ma) displaying distinct biomarker fingerprints are obtained from a previously reported chronological framework in the study area. Accordingly, an eroded thickness of 1214 m and an average erosion rate of 94 cm/ka of the ROM provenance areas during this temporal interval are derived. Our study has illustrated the potential value of geochemical compositions of ROM with constrained provenances in investigating the exhumation history of a mountain.

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“…A relation between MPI-1 and vitrinite reflectance (R o [calculated] = 0.60 × MPI-1 + 0.40) for type III kerogen was suggested by Radke et al (1984). However, the applicability of the empirical relationship to type II kerogen has been discussed controversially (Cassani et al, 1988). Figure 9) is shown by a thick black line.…”

Section: Calibration Datamentioning

confidence: 97%

Evaluation of hydrocarbon generation and migration in the Molasse fold and thrust belt(Central Eastern Alps, Austria) using structural and thermal basin models

Gusterhuber

Hinsch²,

Sachsenhofer

2014

Bulletin

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The Molasse Basin represents the northern foreland basin of the Alps. After decades of exploration, it is considered to be mature in terms of hydrocarbon exploration. However, geological evolution and hydrocarbon potential of its imbricated southernmost part (Molasse fold and thrust belt) are still poorly understood. In this study, structural and petroleum systems models are integrated to explore the hydrocarbon potential of the Perwang imbricates in the western part of the Austrian Molasse Basin.The structural model shows that total tectonic shortening in the modeled north-south section is at least 32.3 km (20.1 mi) and provides a realistic input for the petroleum systems model. Formation temperatures show present-day heat flows decreasing toward the south from 60 to 41 mW/m 2 . Maturity data indicate very low paleoheat flows decreasing southward from 43 to 28 mW/m 2 . The higher present-day heat flow probably indicates an increase in heat flow during the Pliocene and Pleistocene.Apart from oil generated below the imbricated zone and captured in autochthonous Molasse rocks in the foreland area, oil stains in the Perwang imbricates and oil-source rock correlations argue for a second migration system based on hydrocarbon generation inside the imbricates. This assumption is supported by the models presented in this study. However, the model-derived low transformation ratios (<20%) indicate a charge risk. In

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Methylphenanthrene maturity index of marine source rock extracts and crude oils from the Maracaibo Basin

Cited by 108 publications

References 7 publications

Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela)

Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela)

Quaternary exhumation history of the NE Tibetan Plateau revealed by peculiar distributions of polycyclic aromatic hydrocarbons in core extracts from the Sanhu depression, eastern Qaidam basin

Evaluation of hydrocarbon generation and migration in the Molasse fold and thrust belt(Central Eastern Alps, Austria) using structural and thermal basin models

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