Hydrocarbon generation potential and depositional environment of shales in the Cretaceous Napo Formation, Eastern Oriente Basin, Ecuador (Record no. 190237)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04056nab a2200277 4500 |
| 008 - CÓDIGOS DE INFORMACIÓN DE LONGITUD FIJA - INFORMACIÓN GENERAL | |
| Campo de control de longitud fija | 260224s2017 xxu ing |
| 041 ## - IDIOMA | |
| Idioma | Inglés |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Yang, Xiao-Fa |
| 9 (RLIN) | 56393 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Xie, Yin-Fu |
| 9 (RLIN) | 56394 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Zhang, Zhi-Wei |
| 9 (RLIN) | 56395 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Ma, Zhong-Zhen |
| 9 (RLIN) | 56396 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Zhou, Yu-Bing |
| 9 (RLIN) | 56397 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Liu, Ya-Ming |
| 9 (RLIN) | 56398 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Wang, Dan-Dan |
| 9 (RLIN) | 56399 |
| 100 1# - RESPONSABLE PERSONAL | |
| Apellido, Nombre | Zhao, Yong-Bin |
| 9 (RLIN) | 56400 |
| 245 00 - TITULO | |
| Título | Hydrocarbon generation potential and depositional environment of shales in the Cretaceous Napo Formation, Eastern Oriente Basin, Ecuador |
| 260 ## - PUBLICACION, DISTRIBUCION, ETC | |
| Fecha de publicación, distribución, etc. | abr. 2017 |
| 270 ## - FECHA DE CARGA | |
| Fecha de carga | 21/04/2017 ; 20/04/2017 |
| 300 ## - DESCRIPCION FISICA | |
| Otra extensión | 20 p. ; 173-193 |
| 520 ## - RESUMEN, ETC | |
| Resumen | Transcripción del resumen del autor: Marine shale samples from the Cretaceous (Albian-Campanian) Napo Formation (n = 26) from six wells in the eastern Oriente Basin of Ecuador were analysed to evaluate their organic geochemical characteristics and petroleum generation potential. Geochemical analyses included measurements of total organic carbon (TOC) content, Rock-Eval pyrolysis, pyrolysis - gas chromatography (Py-GC), gas chromatography - mass-spectrometry (GC-MS), biomarker distributions and kerogen analysis by optical microscopy. Hydrocarbon accumulations in the eastern Oriente Basin are attributable to a single petroleum system, and oil and gas generated by Upper Cretaceous source rocks is trapped in reservoirs ranging in age from Early Cretaceous to Eocene. The shale samples analysed for this study came from the upper part of the Napo Formation T member ("Upper T"), the overlying B limestone, and the lower part of the U member ("Lower U").The samples are rich in amorphous organic matter with TOC contents in the range 0.71-5.97 wt% and Rock-Eval Tmax values of 427-446°C. Kerogen in the B Limestone shales is oil-prone Type II with d13C of -27.19 to -27.45‰; whereas the Upper T and Lower U member samples contain Type II-III kerogen mixed with Type III (d13C > -26.30‰). The hydrocarbon yield (S2) ranges from 0.68 to 40.92 mg HC/g rock (average: 12.61 mg HC/g rock). Hydrogen index (HI) values are 427-693 mg HC/g TOC for the B limestone samples, and 68-448 mg HC/g TOC for the Lower U and Upper T samples. The mean vitrinite reflectance is 0.56-0.79% R0 for the B limestone samples and 0.40-0.60% R0 for the Lower U and Upper T samples, indicating early to mid oil window maturity for the former and immature to early maturity for the latter. Microscopy shows that the shales studied contain abundant organic matter which is mainly amorphous or alginite of marine origin. Extracts of shale samples from the B limestone are characterized by low to medium molecular weight compounds (n-C14 to n-C20) and have a low Pr/Ph ratio (˜ 1.0), high phytane/n-C18 ratio (1.01-1.29), and dominant C27 regular steranes. These biomarker parameters and the abundant amorphous organic matter indicate that the organic matter was derived from marine algal material and was deposited under anoxic conditions. By contrast, the extracts from the Lower U and Upper T shales contain medium to high molecular weight compounds (n-C25 to n-C31) and have a high Pr/ Ph ratio (>3.0), low phytane/n-C18 ratio (0.45-0.80) with dominant C29 regular steranes, consistent with an origin from terrigenous higher plant material mixed with marine algae deposited under suboxic conditions. This is also indicated by the presence of mixed amorphous and structured organic matter. This new geochemical data suggests that the analysed shales from the Napo Formation, especially the shales from the B limestone which contain Type II kerogen, have significant hydrocarbon potential in the eastern part of the Oriente Basin. The data may help to explain the distribution of hydrocarbon reserves in the east of the Oriente Basin, and also assist with the prediction of non-structural traps. |
| 581 ## - ESTADO DE COLECCIÓN | |
| Estado de colección | 2 |
| 773 0# - CORRECCIÓN | |
| Título | Journal of Petroleum Geology |
| Partes relacionadas | 40 |
| 942 ## - DESC. DE MATERIAL | |
| Tipo de item KOHA | Artículo de Revista |
| Fuente de clasificación | Dewey Decimal Classification |
| Biblioteca propietaria | Biblioteca actual | Fecha de adquisición | Inventario | Total de préstamos | Inventario | Fecha de carga | Tipo de item KOHA |
|---|---|---|---|---|---|---|---|
| Biblioteca Alejandro Angel Bulgheroni | Biblioteca Alejandro Angel Bulgheroni | 06/03/2026 | 200062489 | 200062489 | 06/03/2026 | Artículo de Revista |
