Sequence stratigraphy, sedimentology and petroleum geology of the Glauconitic Member and adjacent strata, Lower Cretaceous Mannville Group, Southern Alberta

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dc.contributor.advisorHopkins, John C.
dc.contributor.authorWood, James M. (James Michael)
dc.coverage.spatial20000069en
dc.date.accessioned2017-12-18T21:09:09Z
dc.date.available2017-12-18T21:09:09Z
dc.date.issued1990
dc.descriptionBibliography: p. 330-350.en
dc.description.abstractThe Lower Cretaceous Mannville Group forms part of the fill of the Cordilleran foreland basin in western Canada. Upper Mannville strata in the subsurface of the study area in southern Alberta accumulated on the cratonic side of the basin. Four upper Mannville lithostratigraphic units are informally recognized (in ascending order): Glauconitic member, and upper Mannville divisions A, B and C. Attention is focussed on the Glauconitic member and division A because many cores from oil and gas wells sample these units. Few cores sample division B, and none sample division C. The Glauconitic member and divisions A and B are differentiated based on sandstone composition, presence of valley fills, and nature of sedimentary structures, paleosols and coals. Upper Mannville strata accumulated in coastal plain settings located landward of fully marine environments. Deposition evolved in response to changes in sediment supply and relative sea level. The Glauconitic member accumulated dominantly in estuarine environments, whereas divisions A, B and C accumulated dominantly in fluvial and deltaic environ­ments. The change in depositional setting coincided with a change in sandstone composition from quartzose to litho­feldspathic. These changes occurred because sediment influx from the orogenic belt began to outstrip accommodation in this part of the foreland basin, and the boreal sea concomitantly regressed generally northward. Valley fills and paleosols in the Glauconitic member and division A indicate the presence of unconformity bounded sequences that formed through numerous cycles of fluvial incision and subaerial exposure followed by aggradation. These cycles, which are interpreted to have been induced by fluctuations of relative sea level, resulted in significant changes in coastal plain deposition. The Glauconitic member accumulated in inner estuarine environments that were confined within valleys when sea level was low, and in outer estuarine bays that covered interfluves when sea level was high. Division A accumulated in fluvial channels that were confined within valleys when sea level was low, and in shal­low deltas that covered interfluves when sea level was high. Most of the oil produced in the study area comes from the Glauconitic member. Reservoir sandstones in valley fills are thick, elongate pods that formed from longitudinal bars when inner estuarine deposition was confined within valleys. Reservoir sandstones outside valley fills are thin sheets that formed from coalesced sand shoal and tidal channel deposits when outer estuarine bays spread across interfluvial areas adjacent to the valleys. Common updip seals for both types of reservoirs are formed by (1) intra­sequence facies changes from sandstone to shale, and (2) younger, cross-cutting valley fills in division A which contain low-permeability lithofeldspathic sandstone.
dc.format.extentxiii, 355 leaves : ill. ; 30 cm.en
dc.identifier.citationWood, J. M. (1990). Sequence stratigraphy, sedimentology and petroleum geology of the Glauconitic Member and adjacent strata, Lower Cretaceous Mannville Group, Southern Alberta (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/464en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/464
dc.identifier.isbn0315669136en
dc.identifier.lccQE 686 W66 1990aen
dc.identifier.urihttp://hdl.handle.net/1880/101465
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lcshGeology, Stratigraphic - Cretaceous
dc.subject.lcshSedimentology
dc.subject.lcshPetroleum - Geology - Alberta
dc.subject.lcshGlauconitic & Lower Mann (Alta.)
dc.subject.lcshFormations (Geology) - Alberta
dc.titleSequence stratigraphy, sedimentology and petroleum geology of the Glauconitic Member and adjacent strata, Lower Cretaceous Mannville Group, Southern Alberta
dc.typedoctoral thesis
thesis.degree.disciplineGeology and Geophysics
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.additionalcopyQE 686 W66 1990en
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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