Petroleum Systems Along The Fold Belt Associated to the Marañon Oriente - Putumayo (MOP) Foreland Basins

Marksteiner, Robert; Alemán, Antenor M.

doi:10.3997/2214-4609-pdb.117.054eng

Cited by 6 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The name of Upper Amazon Basin (UAB) was proposed initially by Feininger (1975) and corresponds to the fore-deep, where the thickest depo-center (at present day) is located, near the Ecuador-Peru boundary (Figure 1). Other names have been assigned to this fore-land basin, such as MOP (Marañón-Oriente-Putumayo) by Marksteiner and Aleman (1997) or NAFB (North Amazonian foreland basin) by Roddaz et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Barba

Barragán

Gallardo

et al. 2021

ijthfa

View full text Add to dashboard Cite

The Upper Amazon Basin (UAB), present foredeep of the sub Andean retro-foreland basin. It comprises Putumayo area (southeastern part of Colombia), Oriente area (eastern Ecuador) and Marañón area (northeastern part of Peru). Bottom Hole Temperature (BHT) from a regional well log database (1076 wells and 2957 logs) were analyzed and data discriminated according to drilling operations (i.e., log acquisition operations, cementing, formation test, tools misreading values), topography and shallow subsurface weathering conditions (i.e., temperature data from wells with depths below 305 m. were avoided). A new normalized database has been setup (1021 wells and 1399 logs). Analysis of this data set has allowed better understanding of the regional distribution of geothermal gradient variations within the study area. The results indicate mean uncorrected geothermal gradient (UCGG) for the UAB of 20.4 °C/km. The UCGG is a first approach based on well data with sufficient information and is useful for comparison purposes with other basin where corrected data is limited. In addition, a new computer-generated contour Geothermal Gradient Map (GGM) has been created, using 56 locations (for which number of BHT at different depths ≥ 3, and temperatures in the range 23.4 to 44.4 °C). As for the locations 2 are in Colombia, 28 in Ecuador and 26 in Peru. This map is useful in analysis data of UCGG due to its wide distribution along the basin. Finally, correction based on Horner´s method was applied to these datasets (where number of BHT ≥3 at the same depth; time since circulation - TSC incremental), obtaining a Corrected Geothermal Gradient (HCGG) of 22.9 °C/km (46 wells and 153 logs). We recommend the use of this gradient for comparative reference purposes.

show abstract

Section: Introductionmentioning

confidence: 99%

Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Barba

Barragán

Gallardo

et al. 2021

ijthfa

View full text Add to dashboard Cite

show abstract

Hydrocarbon Generation Potential and Depositional Environment of Shales in the Cretaceous Napo Formation, Eastern Oriente Basin, Ecuador

Yang

Xie

Zhang

et al. 2017

Journal of Petroleum Geology

View full text Add to dashboard Cite

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 δ13C of −27.19 to −27.45‰; whereas the Upper T and Lower U member samples contain Type II–III kerogen mixed with Type III (δ13C > −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 Ba...

show abstract

The influence of intraplate structural accommodation zones on delineating petroleum provinces of the Sub-Andean foreland basins

Jacques

2004

View full text Add to dashboard Cite

The Sub-Andean foreland region is summarized in a series of palaeogeographical maps. Various time-slices show important basin-forming processes and the extent and evolution of principal depositional elements. Based on spatial and temporal changes in palaeodepositional setting, the Sub-Andean region can be subdivided longitudinally into a number of tectonostratigraphic domains. The differential amount of subsidence between two adjacent tectonostratigraphic provinces or sub-provinces has been taken up across, complex, broad, transverse, transcontinental accommodation zones, which probably represent the multiphase reactivation of pre-existing fault systems in the underlying basement. Two predominant sets of basement lineaments are recognized: ENE-WSW and NW-SE. Both sets of lineaments occur as major structural anisotropies throughout the basement rocks of South America, providing zones of weakness, which were repeatedly reactivated and, at least in part, controlled: (a) the geometry of inter-and intra-cratonic rifting; (b) rates of subsidence and uplift along the Andean depositional axis; (c) the position of basin-bounding and intra-basinal highs/arches; (d) the structural geometry of the Andean Deformation Zone, correlating with changes in deformational style and major deflections; and (e) the location of magmatism.Based primarily on source rock age, it is suggested that these transverse, structural accommodation zones had a profound effect on source rock distribution and hydrocarbon occurrence; subdividing the Sub-Andean region into five petroleum provinces/megasystems: a 'Northern' Late Cretaceous (La Luna Formation and equivalents); a 'Western' Late Palaeozoic-Early Mesozoic (Permian and Upper Triassic to Lower Jurassic source rocks); a 'Central' Palaeozoic (Late Devonian and Silurian); an 'Eastern' Tertiary; and a 'Southern' Mesozoic.

show abstract

Petroleum Systems Along The Fold Belt Associated to the Marañon Oriente - Putumayo (MOP) Foreland Basins

Cited by 6 publications

References 0 publications

Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Geothermal Gradients in the Upper Amazon Basin derived from BHT data

Hydrocarbon Generation Potential and Depositional Environment of Shales in the Cretaceous Napo Formation, Eastern Oriente Basin, Ecuador

The influence of intraplate structural accommodation zones on delineating petroleum provinces of the Sub-Andean foreland basins

Contact Info

Product

Resources

About