| Titre | Hydrocarbon expulsion evaluation based on pyrolysis Rock-Eval data: implications for Ordovician carbonates exploration in the Tabei Uplift, Tarim |
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| Auteur | Chen, J; Zhang, X; Chen, Z ; Pang, X; Yang, H; Zhao, Z; Pang, B; Ma, K |
| Source | Journal of Petroleum Science & Engineering vol. 196, 107614, 2021 p. 1-15, https://doi.org/10.1016/j.petrol.2020.107614 |
| Image |  |
| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200363 |
| Éditeur | Elsevier B.V. |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.petrol.2020.107614 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Région | Tarim River |
| Lat/Long OENS | 86.0833 88.6667 46.7500 45.4167 |
| Lat/Long OENS | -113.0000 -96.0000 53.0000 42.0000 |
| Sujets | ressources pétrolières; hydrocarbures; pétrole; roches mères; géologie du substratum rocheux; lithologie; roches sédimentaires; carbonates; maturation thermique; géochimie organique; production
d'hydrocarbure; kérogène; milieu sédimentaire; milieux marins; Bassin de Williston ; Formation d'Yeoman ; combustibles fossiles; géochimie; Sciences et technologie; Nature et environnement; Phanérozoïque; Paléozoïque; Ordovicien |
| Illustrations | cartes de localisation; échelles stratigraphiques; représentations graphiques combinées; graphiques |
| Diffusé | 2020 07 15 |
| Résumé | (disponible en anglais seulement)
The Middle-Upper Ordovician carbonate source rocks in the Tabei Uplift, Tarim Basin, are at highly mature evolution stage with relatively low present-day TOC
(TOCpd). It is significant to study the hydrocarbon expulsion characteristics for the marine hydrocarbon exploration in Ordovician carbonate reservoirs. Due to similar depositional environment and same kukersite kerogen, two groups of Ordovician
source rocks (468 sets of data from the highly mature Middle–Upper Ordovician source rock (O2+3) in the Tarim Basin and 27 sets of data from the lowly-medium mature Upper Ordovician Yeoman Formation (O3y, Canadian Williston Basin)) are selected as
analogue to research the hydrocarbon expulsion characteristics by the approach of mass balance. The result indicates that the two sets of source rocks (O2+3 and O3y) have similar hydrocarbon generation kinetics with the original hydrocarbon index of
900 mg HC/g TOC and a narrow Tmax window; the kerogen transformation ratio reaches 90% at calculated VRE of 1.10%. The hydrocarbon expulsion threshold of the O2+3 source rock is at calculated VRE of 0.9%, the maximum expulsion intensity can reach 20
× 104 t/km2, and the cumulative volume of expulsion is 9.3 ? 109 tons. The restored TOCo values of the O2+3 can reach approximately 2%, showing a good original potential. The distribution of high quality oil discovered in the Tabei Uplift is in
accordance with that of high hydrocarbon expulsion intensity of the O2+3 carbonate source rocks, implying that the regions with high hydrocarbon expulsion intensity in the southern slope of Tabei Uplift would be favorable exploration areas for the
marine hydrocarbons in the Ordovician carbonates in the Tarim Basin in the future. |
| Sommaire | (Résumé en langage clair et simple, non publié et disponible en anglais seulement)
The study focuses on understanding how hydrocarbons (like oil and gas) are generated and expelled from
ancient rock layers in the Tarim Basin, which is important for marine hydrocarbon exploration. They look at two types of rocks from the Ordovician period and compare them to learn more about this process. They discovered that both types of rocks have
similar characteristics related to hydrocarbon generation. The study found that the Tarim Basin's O2+3 source rocks reached their maximum hydrocarbon expulsion intensity when about 0.9% of the rock's volume had been transformed. They also estimated
that a significant amount of hydrocarbons (about 9.3 billion tons) had been expelled in the past.
The key findings of this research help scientists and those in the oil and gas industry better understand how and where hydrocarbons are found in
ancient rocks. This knowledge can guide future exploration for oil and gas in the Tarim Basin, potentially leading to new discoveries. It is essential for the energy industry to locate and access these resources efficiently. The study's scientific
impact lies in its practical applications for hydrocarbon exploration and resource management. |
| GEOSCAN ID | 327074 |
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