An assessment of the hydrocarbon source rock potential of the Canadian Arctic islands

Powell, T G

doi:10.4095/103606

Cited by 56 publications

(39 citation statements)

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“…This interpreted level of thermal maturation is consistent with the occurrence of higher-molecular-weight hydrocarbon gases (C 2 -C 4 ) (Powell, 1978) as indigenous products of catagenesis, observed in the headspace gas samples (Table 5).…”

Section: Rock-eval Pyrolysissupporting

confidence: 64%

“…The onset of significant amounts of ethane and propane in the headspace gas at about 880 mbsf coincided precisely with the same observation in the Eendracht well. The increase in concentration of "wet gas" has been interpreted herein to indicate that the level of thermal maturation attained a threshold level equivalent to a vitrinite reflectance level of about 0.45% R o (Powell, 1978). Because of the presence of inferred epigenetic gases in the overlying rocks, it must be assumed that some of the gas in the lowermost 100 m of Site 762 is also migrated dry gas.…”

Section: Safety Considerationsmentioning

confidence: 99%

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Site 762

1990

Proceedings of the Ocean Drilling Program, 122 Initial Reports

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1 Haq, B. U., von Rad, U., et al., 1990. Proc. ODP, Init. Repts., 122: College Station, TX (Ocean Drilling Program).2 Shipboard Scientific Party is as given in the list of Participants preceding the contents. 112°15.24'E, water depth 1360 m) is located on the western part of the central Exmouth Plateau. In this area a thick Triassic paralic section is unconformably overlain by a thin upper Jurassic marine succession and lower Cretaceous prodelta sediments, which is in turn covered by mid-Cretaceous to Cenozoic pelagic carbonates. This site was chosen to provide documentation of the Cretaceous and Tertiary depositional sequences and cycles of sea-level change in an area with excellent seismic-stratigraphic control. Together with Site 763 (which is closer to the source of terrigenous influx), this site was expected to furnish data that will help separate the tectonic, sedimentary, and eustatic signals for testing sequence stratigraphic models. Site 762 was drilled to a total depth (TD) of 940 m and recovered a section ranging in age from Berriasian to Quaternary, with an overall recovery rate of 75%. The upper 182 m of foraminifer-nannofossil and nannofossil oozes of late Oligocene through Quaternary age are underlain by nannofossil oozes and chalks of early Paleocene to late Oligocene age with numerous intervals of cyclic color bands. The Cretaceous/Tertiary boundary occurs at 554.6 mbsf, within the nannofossil chalk, and is marked by a slight color change. HOLE 762CDateThe chalky lithofacies is present to 838.5 mbsf. Clay content is generally greater in the lower part of the section; age ranges from early Albian to latest Maestrichtian. The Cenomanian chalks include abundant pressure-solution contacts (stylolites). The Cenomanian/Turonian boundary is well represented by an interval rich in organic material. Below 838.5 mbsf, a 10-m-thick unit of black shales (equivalent to Muderong Shales on land) of early Aptian age probably represents a period of anoxia on the plateau in an open-marine setting. The mid-Cretaceous to Paleogene section is essentially complete and in large part well preserved. The black shales are unconformably underlain by silty claystones and prodelta claystones of Berriasian to early Valanginian age (equivalent to the Barrow Group on land), which extend to the TD of 940 mbsf. A belemnite-rich horizon below the black shales might represent the beginning of a major global late Neocomian transgression. The site yielded an expanded Maestrichtian-Paleocene succession with well-preserved calcareous microflora and fauna, suitable for detailed magneto-biostratigraphic and stable-isotopic work. Nannofossils, and to some extent, foraminifers, were useful in assigning ages to the pre-Tertiary section. Rich dinoflagellate assemblages were found in the Aptian black shales.Three logging runs with the seismic-stratigraphic, geochemical, and neutron-density tools generated logs for detailed correlations and for safety considerations regarding the subsequent drilling of Site 763. Careful monitoring of hydroca...

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Section: Rock-eval Pyrolysissupporting

confidence: 64%

Section: Safety Considerationsmentioning

confidence: 99%

Site 762

1990

Proceedings of the Ocean Drilling Program, 122 Initial Reports

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“…These values are equivalent to a vitrinite reflectance range from about 0.4% to 0.5% R o in Unit V to about the equivalent of 0.65% R o at the bottom of Hole 763C. This interpreted level of thermal maturation is consistent with the occurrence of higher molecular weight hydrocarbon gases (C 2 -C 4 ) (Powell, 1978) as indigenous products of catagenesis observed in the headspace gas (Table 5). The level of maturity inferred from the Rock-Eval pyrolysis data at Site 763 is somewhat higher than for the approximately equivalent section at Site 762 (Site 762 chapter, this volume).…”

Section: Rock-eval Pyrolysissupporting

confidence: 69%

“…We interpret the increase in concentration of "wet gas" herein to indicate that the level of thermal maturation attained a thresh old level equivalent to a vitrinite reflectance level of about 0.45% R ? (Powell, 1978). Because of the presence of inferred epigenetic gases in the overlying rocks, it must be assumed that some of the gas in the lowermost 250 m of Site 763 is also migrated dry gas.…”

Section: Safety Considerationsmentioning

confidence: 99%

Site 763

1990

Proceedings of the Ocean Drilling Program, 122 Initial Reports

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“…Several workers believe that certain coals, where liptinite is low, contain hydrogen-rich vitrinite which generates oil (Bertrand, 1989;Newman et al, 1997;Petersen et al, 2000;Singh, 2012;Singh et al, 2013). Based on the studies made on solvent extraction, coal pyrolysis, and variation of porosity and permeability with rank, it is understood that the generated hydrocarbon products have a finite storage capacity, and until this capacity is exceeded, there will not be any oil expulsion (Durand, 1983;Inan et al, 1998;Mc Auliffe, 1979;Powell, 1978;Tissot and Welte, 1984). Wilkins and George (2002) have explained that hydrocarbon expulsion would occur by activated diffusion of molecules to maceral boundaries and ultimately by cleats and fractures.…”

Section: Thermal Maturity and Oil Potentialmentioning

confidence: 99%

Studies on thermal maturity and hydrocarbon potential of lignites of Bikaner–Nagaur basin, Rajasthan

Singh

Rajak

Singh

et al. 2016

Energy Exploration & Exploitation

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In the present investigation, an attempt has been made to study lignite samples from the working mines of Bikaner-Nagaur basin of Rajasthan with reference to their maturity and their hydrocarbon potential. The study has been made on the basis of petrological and geochemical characteristics. The assessments made through the empirically derived equations have been cross-checked and correlated with the rock-eval data. The study reveals that the low rank coals of BikanerNagaur basin contain mainly kerogen type-III organic matter and are dominantly composed of huminite (77-87%) with small concentrations of liptinite (4-11%) and inertinite (2-14%), which are worth liquefying to obtain liquid oil and gas. Further, the high conversion factor (93-95%) and high oil yield (63-65%) make them industrially significant, considering the vast lignite resource of the region.

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An assessment of the hydrocarbon source rock potential of the Canadian Arctic islands

Cited by 56 publications

References 0 publications

Site 762

Site 762

Site 763

Studies on thermal maturity and hydrocarbon potential of lignites of Bikaner–Nagaur basin, Rajasthan

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