Integrating Outcrop and Subsurface Data to Evaluate Data-Poor Shale Plays: The Devonian Canol Formation, Northwest Territories, Canada

Jonk, R.; Potma, Ken; Bohacs, Kevin M.; Advocate, David M.; Starich, Patrick

doi:10.15530/urtec-2014-1896700

Cited by 2 publications

(1 citation statement)

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“…The total organic carbon (TOC) values of the subaerially exposed Upper Jurassic limestones in the study area are very low (average <0.1 %; Troskot-Čorbić, 2012). However, such low values from uplifted and exhumed outcrops could be the result of surface weathering processes that could have dramatically altered rock properties (e.g., Jonk et al, 2014, Haeri-Ardekani, 2015. No TOC data is currently available from the subsurface equivalents in southern Adriatic.…”

Section: Geologic Settingmentioning

confidence: 99%

Palynofacies and paleoenvironment of the Upper Jurassic mud-supported carbonates, southern Croatia: Preliminary evaluation of the hydrocarbon source rock potential

Koch

Prtoljan

Husinec

et al. 2017

Marine and Petroleum Geology

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Despite the vast research on various aspects of its stratigraphy, relatively little is known about the source-rock potential of the Upper Jurassic Adriatic platform, southern Croatia. Here a case palynological study has been provided to determine the kerogen type, quality, and thermal maturity, and assess its relative hydrocarbon generative potential. Palynofacies characteristics indicate a low-energy, shallow-marine oxygen-depleted setting. The deposited mud-supported carbonates contain organic matter that is almost entirely composed of a fluorescent amorphous organic matter of planktonic and bacterial origin. A high phycomata/dinocyst ratio suggests relative hydrographic stability in an environment favorable for motile-stage dinoflagellate community with reduced production of dinocysts. The lack of anaerobic degradation and very good preservation of lipoid palynomorphs indicates dysoxic conditions; the latter also is suggested by a low proportion of algal-phytoplanktic carbohydrates. The lack of oxygen-deficient zone within the water column, coupled with well-preserved lipoid sediment components, suggests that the boundary between the oxygen-rich and oxygen-poor levels was likely located at/near the sediment-water interface. The palyno-organic facies analysis suggests that the organic matter corresponds to the type II (possibly I/II) kerogen (VRo ~0.3-0.4%) that was protected from degradation before, during and after sedimentation. Well-preserved lipoid components suggest a good hydrocarbon-generative potential, but the low TOC values (<0.1%) of studied outcropping Upper Jurassic carbonates prevent their designation as source rocks. Given the known sourcerock potential of the Upper Jurassic succession in the wider region, further studies of subsurface samples are needed to exclude the Oligocene-recent subaerial weathering as a culprit for the low TOC values.

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Section: Geologic Settingmentioning

confidence: 99%