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TitleGeologic setting and tectonic evolution of Eagle Plain Basin, northern Yukon, Canada: Implications for petroleum potential
AuthorHannigan, P KORCID logo; Lane, L SORCID logo
SourceGAC-MAC-CSPG-CSSS Joint Meeting, Abstracts vol. 39, 2016 p. 32-33 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20150425
PublisherGeological Association of Canada
MeetingGAC-MAC 2016 Annual Conference; Whitehorse, YT; CA; June 1- 3, 2016
File formatpdf
NTS106E; 106L; 116H; 116I
AreaEagle Plains
Lat/Long WENS-138.0000 -134.0000 67.0000 65.0000
Subjectsgeneral geology; tectonics; petroleum; petroleum exploration; petroleum generation; petroleum resources; structural analysis; structural basins; Cordilleran Orogenic system; Permian; Carboniferous; Paleozoic
ProgramGeoscience for New Energy Supply (GNES) Frontier basin analysis
Released2016 01 01
Eagle Plain in northern Yukon is underlain by an intermontane petroliferous sedimentary basin that has been shaped by multiple tectonic events throughout its Phanerozoic history. These eventsintimately affected the generation, migration and distribution of petroleum accumulations in the basin. Major advances in understanding the basin's structural evolution provided impetus for the Geological Survey of Canada to re-evaluate the petroleum potential of the basin incorporating newly-identified exploration play concepts. All discoveries to date are located in southern Eagle Plain and were drilled on large Laramide surface structures.Eagle Plain is located within the ordilleran Orogenic system of northern Canada characterized by marked crustal instability. Angular unconformities, diverse structural trends, fold bundles, and extension, contraction and transcurrent faults are common features of the region. During Late Devonian time, south-directed Ellesmerian tectonism affected the region. Broad east-west trending open folds are preserved in the subsurface of northeastern Eagle Plain Basin. In the basin, a major northeast-southwest feature called Eagle Arch, a pre-Mesozoic upwarp of Paleozoic strata, marks the northern limit of erosional edges of various Upper Paleozoic successions. The Arch was active during Late Carboniferous to Early Permian time resulting in erosion of the Carboniferous succession to the north. Early Permian Arch movement uplifted northern Eagle Plain
resulting in bevelling of underlying Paleozoic strata beneath the sub-Mesozoic unconformity. Early stages of the Cordilleran orogenesis produced Jurassic and Cretaceous mountain ranges to the south of Eagle Plain region. These ranges were the source areas for clastic debris that shed northward into the foredeep region through Late Cretaceous time. Broad north-trending folds detached by décollements within the Proterozoic succession were formed in Eagle Plain. To the west, more intense deformation produced mainly thrust faults.
In northeastern Eagle Plain, Laramide thrusting and folding of Mesozoic strata form Tertiary triangle zones marginal to the basin. Stratigraphic and combination traps are also present in Eagle Plain. These trap configurations include updip basinward facies changes, subcrops of Upper Paleozoic reservoirs beneath the sub-Cretaceous unconformity and carbonate-to-shale facies changes in Lower Paleozoic strata. The probabilistic assessment of total oil and gas potential (discovered and undiscovered) for all Phanerozoic sedimentary strata in the basin is 52.2*106 m3 (329 MMBO) of oil and 96.7*109 m3 (3.4 Tcf) of gas (in-place mean volumes).
Summary(Plain Language Summary, not published)
A comprehensive petroleum resource potential study has been completed in Eagle Plain Basin of northern Yukon. Sufficient data was available in the majority of 21 defined plays established throughout the stratigraphic column from Ordovician to Cretaceous age to predict their oil and gas endowment. The probabilistic assessment of total oil and gas potential (discovered and undiscovered) for all Phanerozoic sedimentary strata in Eagle Plain and its environs is 52.2 million cubic metres (329 MMBO) of oil and 96.7 billion cubic metres (3.4 Tcf) of gas (in-place mean volumes). Major advances in defining the basin's structural evolution have identified new and untested conceptual exploration petroleum plays in the area. These new play concepts with their predicted volumes provide important information for stakeholders involved in evaluating land-use issues and for petroleum industry companies in pursuing future exploration opportunities

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