Assessment of the oil source-rock potential of the Pedregoso Formation (Early Miocene) in the Falcón Basin of northwestern Venezuela

Montero‐Serrano, Jean‐Carlos; Martínez, M.; Riboulleau, Armelle; Tribovillard, Nicolas; Márquez, G.; Gutiérrez-Martín, José Vicente

doi:10.1016/j.marpetgeo.2009.12.007

Cited by 18 publications

(8 citation statements)

References 33 publications

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“…The tricyclic/pentacyclic terpane ratios of the K 1 g 0 , K 1 g 1 , K 1 g 2 , and K 1 g 3 samples vary from 0.07 to 0.1 (average: 0.08), 0.03 to 0.6 (average: 0.14), 0.14 to 0.41 (average: 0.28), and 0.18 to 0.41 (average: 0.26), respectively (Table 4). This indicates that the thermal maturity of source rocks is not high and can have bacterial contribution to OM (Ourisson and Rohmer 1992;Montero-Serrano et al 2010). The C 21 /C 23 tricyclic terpane ratios of the K 1 g 0 , K 1 g 1 , K 1 g 2 , and K 1 g 3 source rocks range from 1.13 to 1.37 (average: 1.25), 0.53 to 1.91 (average: 1.28), 0.83 to 1.8 (average: 1.29), and 1.14 to 1.78 (average: 1.38), respectively, and the C 24 tetracyclic/C 23 tricyclic terpane ratios range from 0.82 to 0.94 (average: 0.88), 0.26 to 7.25 (average: 1.36), 0.22 to 1.67 (average: 0.6), and 0.25 to 1.08 (average: 0.59), respectively (Table 5).…”

Section: Terpanesmentioning

confidence: 99%

“…10). The tricyclic terpane abundance increasing with respect to hopane is controlled by thermal maturity and biodegradation (Connan and Cassou 1980;Seifert and Moldowan 1986;Peters et al 2005), and higher pentacyclic triterpane is associated with bacterial contribution to OM in the source rocks (Ourisson and Rohmer 1992;Montero-Serrano et al 2010). The tricyclic/pentacyclic terpane ratios of the Xiagou Formation source rocks range between 0.03 and 0.06 (average: 0.19) ( Table 4).…”

Section: Terpanesmentioning

confidence: 99%

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Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

Gao

Zhang

et al. 2018

Pet. Sci.

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The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin, northwestern China. The Xiagou Formation source rock was formed in a closed, anoxic, reducing, alkaline lacustrine environment with a high salinity. Its high content of brittle minerals is favorable for the fracturing of reservoirs in source rock formations in the Qingxi Sag. The Xiagou Formation contains a great number of fair to excellent source rocks, and their organic matter (OM) came chiefly from plankton/algae and high plants as well as possibly bacterial organisms. The Xiagou Formation source rocks mainly contain Type II OM and some Type III and Type I OM, with good oil-generating potential. The source rock maturity is mainly in the early-mature and mature stages, and its R o value corresponding to oil peak is about 0.8%, which is lower than classic oil peak R o value of 1.0%; therefore, a great deal of hydrocarbon was generated before the classic oil peak R o = 1.0%. Mature source rock in the Xiagou Formation tends to be distributed in the older members and at a greater depth. There is a better exploration potential of tight oil in the deep Qingxi Sag.

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Section: Terpanesmentioning

confidence: 99%

Section: Terpanesmentioning

confidence: 99%

Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

Gao

Zhang

et al. 2018

Pet. Sci.

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“…The Pedregoso Fm. is a turbidite succession composed of organic-rich pelagic shales with rhythmically interbedded allodapic limestones and rarely sandstones (Montero-Serrano et al, 2010). The limestones comprise carbonate brecchias and packstones to rudstones with a wide variety of reworked allochthonous skeletal grains including larger foraminifera, coralline algae, coral fragments, echinoids and mollusks.…”

Section: Central Falcón Basinmentioning

confidence: 99%

Geology of the Falcón Basin (NW Venezuela)

et al. 2017

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This paper presents a geological map and cross-section of the Falcón Basin based both on published and unpublished work and on new data collected in the northern and southern basin margins. The geological map covers an area of 4600 km 2 at 1:100,000 scale. The crosssection is oriented NNW-SSE, traversing perpendicular to the main structures. In general, the structure of the study area results from the inversion of a graben (Oligocene-early Miocene back-arc basin), that started in the middle Miocene due to the convergence between the Caribbean and South American plates. The map, the cross-section and the observations made in the field have been used to generate a tectonostratigraphic reconstruction of the Falcón Basin. The Oligocene-early Miocene sedimentary succession mapped and described is relevant to the hydrocarbon exploration in the Caribbean and in the Gulf of Venezuela, where new hydrocarbon resources have recently been discovered (i.e. Perla gas field).

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“…These incomplete mass balance analyses suggest that the isolated kerogen contains a significant amount of residual minerals (e.g. Montero-Serrano et al, 2010). Kerogens from the NMS section have H/C ratios between 0.82 and 1.6 and O/C ratios between 0.07 and 0.3.…”

Section: Elemental Analysesmentioning

confidence: 99%

“…The pristane/phytane (Pr/Ph) ratio is a commonlyused parameter for the study of oxic/anoxic conditions (e.g. Montero-Serrano et al, 2010). However, differences in thermal maturity (Koopmans et al, 1999) and variable source input (ten Haven et al, 1987) must be taken into account when Pr/Ph ratios are considered.…”

Section: Bitumen Composition and Organic Geochemistrymentioning

confidence: 99%

Organic Geochemistry of Potential Source Rocks in the Tertiary Dingqinghu Formation, Nima Basin, Central Tibet

Wang

et al. 2010

Journal of Petroleum Geology

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The Tertiary Nima Basin in central Tibet covers an area of some 3000 km2 and is closely similar to the nearby Lunpola Basin from which commercial volumes of oil have been produced. In this paper, we report on the source rock potential of the Oligocene Dingqinghu Formation from measured outcrop sections on the southern and northern margins of the Nima Basin. In the south of the Nima Basin, potential source rocks in the Dingqinghu Formation comprise dark‐coloured marls with total organic carbon (TOC) contents of up to 4.3 wt % and Hydrogen Index values (HI) up to 849 mg HC/g TOC. The organic matter is mainly composed of amorphous sapropelinite corresponding to Type I kerogen. Rock‐Eval Tmax (430–451°C) and vitrinite reflectance (Rr) (average Rr= 0.50%) show that the organic matter is marginally mature. The potential yield (up to 36.95 mg HC/g rock) and a plot of S2 versus TOC suggest that the marls have moderate to good source rock potential. They are interpreted to have been deposited in a stratified palaeolake with occasionally anoxic and hypersaline conditions, and the source of the organic matter was dominated by algae as indicated by biomarker analyses. Potential source rocks from the north of the basin comprise dark shales and marls with a TOC content averaging 9.7 wt % and HI values up to 389 mg HC/g TOC. Organic matter consists mainly of amorphous sapropelinite and vitrinite with minor sporinite, corresponding to Type II‐III kerogen. This is consistent with the kerogen type suggested by cross‐plots of HI versus Tmax and H/C versus O/C. The Tmax and Rr results indicate that the samples are immature to marginally mature. These source rocks, interpreted to have been deposited under oxic conditions with a dominant input of terrigenous organic matter, have moderate petroleum potential. The Dingqinghu Formation in the Nima Basin therefore has some promise in terms of future exploration potential.

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Assessment of the oil source-rock potential of the Pedregoso Formation (Early Miocene) in the Falcón Basin of northwestern Venezuela

Cited by 18 publications

References 33 publications

Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

Geology of the Falcón Basin (NW Venezuela)

Organic Geochemistry of Potential Source Rocks in the Tertiary Dingqinghu Formation, Nima Basin, Central Tibet

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