Geochemical characterization of crude oils and potential source rocks from southern coastal Ecuador: Hypothetical petroleum systems

Márquez, G.; Morato, Antonio Carlos; Guzmán, Marco; Boente, Carlos; Witt, César

doi:10.1016/j.marpetgeo.2022.105545

Cited by 7 publications

(2 citation statements)

References 66 publications

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“…100 and supplemented with data from Refs. 78,86,[101][102][103][104][105][106][107][108][109][110][111][112] . Unlike for kerogen, more care must be taken when reporting crude oil ages since depositional age can differ from host-rock age due to oil migration.…”

Section: Crude Oilmentioning

confidence: 99%

The geologic history of marine dissolved organic carbon from iron oxides

Galili,

Bernasconi,

Nissan

et al. 2024

Preprint

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Dissolved organic carbon (DOC) is the largest reduced carbon reservoir in modern oceans¹,². Its dynamics regulate marine communities and atmospheric CO₂ levels³,⁴, whereas ¹³C compositions track ecosystem structure and autotrophic metabolism⁵. However, the geologic history of marine DOC remains entirely unconstrained⁶,⁷, hindering our ability to mechanistically reconstruct coupled ecological and biogeochemical evolution. To address this, we developed the first direct proxy for past DOC signatures using co-precipitated organic carbon in iron ooids, and we applied this to 26 marine iron ooid-containing formations deposited over the past 1650 million years. Predicted DOC concentrations were near modern levels in the Paleoproterozoic then decreased by 90-99% in the Neoproterozoic before sharply rising in the Cambrian. We interpret these dynamics to reflect three distinct states: (i) small, single-celled organisms combined with severely hypoxic deep oceans; (ii) larger, more complex organisms and little change in oxygenation; (iii) continued organism growth and a transition to fully oxygenated oceans⁸,⁹. Furthermore, modern DOC is significantly ¹³C-enriched relative to the Proterozoic, likely due to changing autotrophic fractionation driven by biological innovation; together with isotopically invariant carbon inputs to Earth's surface¹⁰, this implies increasing relative organic carbon burial through time. Our results reveal new connections between the carbon cycle, ocean oxygenation, and the evolution of complex life.

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Section: Crude Oilmentioning

confidence: 99%

The geologic history of marine dissolved organic carbon from iron oxides

Galili,

Bernasconi,

Nissan

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…1). The complex structural architecture and petroleum systems of this frontier forearc region have been strongly studied by academic and petroleum industry through numerous seismic reflection and exploration well data (e.g., Benitez, 1995;Deniaud et al, 1999;Deniaud, 2000;Collot et al, 2002;Higley, 2004a, b;Calahoranno, 2005;Fernández et al, 2005;Witt et al, 2006;Cobos, 2010;Espurt et al, 2018;Reynaud et al, 2018;Aizprua et al, 2019;Lemgruber-Traby et al, 2020;Guzmán et al, 2022;Márquez et al, 2022). These studies show that the Tumbes-Gulf of Guayaquil forearc basin is characterized by: (1) a massive Cenozoic prograding sedimentary infill containing ductile basal shale layers (Higley, 2004a,b;Espurt et al, 2018); (2) a large crustal-scale strike-slip fault zone, the Puná fault zone that crosses obliquely the forearc basin, leading to significant transtensional deformation favoring available space and sedimentary trapping in the forearc basin (Benitez, 1995;Deniaud et al, 1999;Deniaud, 2000;Cobos, 2010).…”

Section: Introductionmentioning

confidence: 99%