The distribution of thermogenic, bacterial and inorganic fluid sources in the petroleum systems of the Llanos Basin (Colombia) – Insights from the noble gases and carbon stable isotopes

Gonzalez-Penagos, Felipe; Rouchon, Virgile; Guichet, Xavier; Moretti, Isabelle

doi:10.1016/j.marpetgeo.2015.11.007

Cited by 9 publications

(6 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the discovery of the Chuchupa and Ballenas fields in the 1970s [43,44], the offshore Colombian Caribbean has been considered a gas province originating mainly from microbial activity [45]. The latest discoveries in areas located below 2000 m with the drilling of the Orca (2014), Kronos (2015), Purple Angel (2017) and Gorgon (2022) exploratory wells confirm the presence of an emerging basin dominated by methane [46]. This suggests occurrences not only of biogenic origin but also the thermogenic generation of hydrocarbons [46,104].…”

Section: Discussionmentioning

confidence: 99%

Acoustic Evidence of Shallow Gas Occurrences in the Offshore Sinú Fold Belt, Colombian Caribbean Sea

Osorio-Granada,

Jigena-Antelo,

Vidal-Perez

et al. 2023

JMSE

View full text Add to dashboard Cite

High-resolution seismic analysis and bathymetry data, used in the Offshore Sinú Fold Belt (OSFB), have revealed seabed and sub-surface anomalies, which were probably caused by the presence of shallow gas within the sedimentary records. Shallow gas is widely detected by the frequent presence of anomalous acoustic reflections including acoustic blanking, enhanced reflections, acoustic plumes, pockmarks, and dome structures. More than 30 anomalies that occur within a subsurface depth of ~65 m were acoustically detected within an area of 1000 km2 on the continental shelf and upper continental slope, in water depths ranging from −20 to −1300 m. Moreover, a map with the spatial distribution of the gas occurrences is shown. A close relationship between the locally elevated seabed (dome structures), pockmarks, and acoustic blanking was found. Most of the active pockmarks may be closely related to the submarine path of the Uramita Fault, indicating that the gas occurrences are controlled by active faulting. The shallow gas occurrence was confirmed by the generation of authigenic carbonate and the occurrence of chemosymbiotic biological communities sampled in the area. Although there is an admixture of biogenic gas, it is believed that many of the features observed relate to thermogenic gas. The identification of these anomalies represents a useful basis for an assessment of marine geohazards and can serve as a hydrocarbon exploration tool.

show abstract

Section: Discussionmentioning

confidence: 99%

Acoustic Evidence of Shallow Gas Occurrences in the Offshore Sinú Fold Belt, Colombian Caribbean Sea

Osorio-Granada,

Jigena-Antelo,

Vidal-Perez

et al. 2023

JMSE

View full text Add to dashboard Cite

show abstract

“…Overpressures have been measured along the western edge of the Llanos Basin, probably caused by lateral influx of fluids from the uplifted folds and the deformed belt of the Eastern Cordillera [52]. Additionally, along the foredeep zone, Helium concentrations in aquifer fluids from the Une and Mirador Formations suggest probable mantle contributions [61].…”

Section: Geothermal Setting Of the Basinmentioning

confidence: 98%

“…The lateral variation of gradient temperature may be related to the expulsion of diagenetic waters from deep aquifers, which occurred during the structural advance of the Eastern Cordillera foothills [19]. These areas with probable fluid expulsion from deep reservoirs, coincide with areas where overpressures have been measured, along the Llanos foothills [52], as well as the presence of helium, with isotopic signatures linked to mantellic sources to the foredeep zone through cortical fault systems [61]. In this context, is may be considered that the structural advance of the Eastern Cordillera foothills over the Llanos Basin has led to the expulsion of overpressure waters in clay units, which have probably started their transformation process from smectite to illite, further dilating the thermal structure along the central-eastern edge of the Llanos Basin.…”

Section: Potential Heat Of the Basinmentioning

confidence: 99%

Low - medium enthalpy geothermal resource assessment in deep reservoirs of the Llanos Basin - Colombia

Ramos

Gonzalez-Penagos

Patiño

et al. 2022

CT&F Cienc. Tecnol. Futuro

Self Cite

View full text Add to dashboard Cite

The exploration and exploitation of hydrocarbons in sedimentary basins such as the Llanos Basin of Colombia, have enabled the acquisition of large volumes of surface and subsurface data, for assessing the geothermal potential of deep aquifers. The integrated analysis of geothermal play elements such as temperature, reservoir - fluid properties, and their depth in the basin, with the available hydrogeological-chemical data, allow us to define three regional plays as follows: Play A, characterized by naturally fractured reservoirs, in crystalline basement rocks - Paleozoic, with temperatures above 150 ºC, semi-confined aquifers; b) Play B, composed by Mesozoic quartz sandstone reservoirs, with primary porosity greater than 10%, temperatures between 75 ºC to 150 ºC, semi-confined aquifers, near to high hydraulic head zones with 500 m difference ranges in the regional piezometric surface; c) Play C, composed by Mesozoic quartz sandstones, high primary porosity, temperatures below 100 ºC, confined aquifers. Available well and Oil and Gas production data suggests that Play A is speculative, Play B is hypothetical, and Play C is known.

show abstract

“…Compared with the gases from the Zhongba Leikoupo Formation, the dryness coefficients were similar, the H 2 S content was lower than that of the gases from the Leikoupo Formation in well CK1, and the N 2 and CO 2 contents were similar, indicating that portions of the gas source were consistent. Compared with the oil-associated gases of the Hewanchang gas field, the dryness coefficients were the same, but the methane content of the Leikoupo Formation are lower and the CO 2 and N 2 contents were of the Leikoupo Formation are higher, suggesting that the natural gas type and parent organic material had similar marine source rocks (Xu et al, 2012;Feng et al, 2013;Gonzalez-Penagos et al, 2016) (Table 4).…”

Section: Natural Gas Compositionmentioning

confidence: 99%

Characteristics and Natural Gas Origin of Middle–Late Triassic Marine Source Rocks of the Western Sichuan Depression, SW China

Sun

Luo

Qing

et al. 2020

Acta Geologica Sinica (Eng)

View full text Add to dashboard Cite

A scientific exploration well (CK1) was drilled to expand the oil/gas production in the western Sichuan depression, SW, China. Seventy‐three core samples and four natural gas samples from the Middle–Late Triassic strata were analyzed to determine the paleo‐depositional setting and the abundance of organic matter (OM) and to evaluate the hydrocarbon‐generation process and potential. This information was then used to identify the origin of the natural gas. The OM is characterized by medium n‐alkanes (nC15–nC19), low pristane/phytane and terrigenous aquatic ratios (TAR), a carbon preference index (CPI) of ∼1, regular steranes with C29 > C27 > C28, gammacerane/C30hopane ratios of 0.15–0.32, and δDorg of −132‰ to −58‰, suggesting a marine algal/phytoplankton source with terrestrial input deposited in a reducing–transitional saline/marine sedimentary environment. Based on the TOC, HI index, and chloroform bitumen “A,” the algal‐rich dolomites of the Leikoupo Formation are fair–good source rocks; the grey limestones of the Maantang Formation are fair source rocks; and the shales of the Xiaotangzi Formation are moderately good source rocks. In addition, maceral and carbon isotopes indicate that the kerogen of the Leikoupo and Maantang formations is type II and that of the Xiaotangzi Formation is type II–III. The maturity parameters and the hopane and sterane isomerization suggest that the OM was advanced mature and produced wet–dry gases. One‐dimensional modeling of the thermal‐burial history suggests that hydrocarbon‐generation occurred at 220–60 Ma. The gas components and C–H–He–Ar–Ne isotopes indicate that the oil‐associated gases were generated in the Leikoupo and Maantang formations, and then, they mixed with gases from the Xiaotangzi Formation, which were probably contributed by the underlying Permian marine source rocks. Therefore, the deeply‐buried Middle–Late Triassic marine source rocks in the western Sichuan depression and in similar basins have a great significant hydrocarbon potential.

show abstract

The distribution of thermogenic, bacterial and inorganic fluid sources in the petroleum systems of the Llanos Basin (Colombia) – Insights from the noble gases and carbon stable isotopes

Cited by 9 publications

References 28 publications

Acoustic Evidence of Shallow Gas Occurrences in the Offshore Sinú Fold Belt, Colombian Caribbean Sea

Acoustic Evidence of Shallow Gas Occurrences in the Offshore Sinú Fold Belt, Colombian Caribbean Sea

Low - medium enthalpy geothermal resource assessment in deep reservoirs of the Llanos Basin - Colombia

Characteristics and Natural Gas Origin of Middle–Late Triassic Marine Source Rocks of the Western Sichuan Depression, SW China

Contact Info

Product

Resources

About