The Sedimentology and diagenesis of the Cadomin formation, Elmworth area, northwest Alberta
| dc.contributor.advisor | Hopkins, John C. | |
| dc.contributor.author | Varley, Christopher John, 1956- | |
| dc.coverage.spatial | 2000001398 | en |
| dc.date.accessioned | 2005-07-21T20:34:52Z | |
| dc.date.available | 2005-07-21T20:34:52Z | |
| dc.date.issued | 1982 | |
| dc.description | Bibliography: p. 131-137. | en |
| dc.description.abstract | The Cadanin Formation Blairrrore Group of is the basal unit of Northwestern Alberta. the Lower Cretaceous It is a wedge-shaped CC>njlaneratic molasse deposit of the Columbian Orogeny. Laramide thrusting and subsequent erosion exposed the thickest sections of Cadanin in the Foothills of the Rocky mountains. Beyond the eastern limit of OJerhrusti~ the deposit has been deeply buried in the Alberta Deep Basin. There it forms a thin, laterally extensive sheet-like unit which overlies a regional unconfirmity of low, topographic relief. The Cadanin was deposited in an alluvial-fan - braidplain environment. Climatic conditions were humid. Braided river systems have reworked the detritus lateraly and distally and a thin yet widespread distribution has resulted. Systematic textural variations and facies assemblages have been identified and a Scott to Donjek type braided-river deposit is inferred. Proximal to distal trends include decreasirg clast-size, increasing sand content, and a decreasing proportion of bimodal textures while poorly sorted textures are increasingly abundant. In the subsurface, the unit forms a gently southwest dipping monocline in which a Deep Basin type hydrocarbon reservoir has developed. Porous and permeable water-bear is strata pass downdip into poor reservoir quality gas-saturated strata. Significant gas reserves have been established in the Elmworth Area but production is lirnited to higher permeability zones. Permeability and ultimate reservoir potential is a function of the primary depositional textures and the diagenetic modifications. Moderately sorted and poorly sorted conglomerate textures generally have higher porosities and permeabilities than bimodal conglomerate textures of clast or matrix-supported pebbles and sand. A variation in diagenetic modification exists in the Cadornin because of a geothernal gradient and an increasing depth of burial towards the rou thrust of the Deep Basin Area. Permeabilities are reduced in zones of quartz overgrowth cementation and added authigenic clay matrix. Secondary porosity is developed and permeabilities enhanced in zones of disrolution and leaching by pore fluids. Successful exploitation of these conglomerates depends on knowledge of reservoir facies textures and diagenetic controls. | |
| dc.description.notes | This title is not available online. Access options are: - consulting the copy from Archives in our reading room in person - https://asc.ucalgary.ca/visiting/ - borrowing a circulating copy from the Library catalogue – https://ucalgary.primo.exlibrisgroup.com/discovery/search?vid=01UCALG_INST:UCALGARY&lang=en | |
| dc.format.extent | xv, 173 leaves : ill., maps ; 30 cm. | en |
| dc.identifier.citation | Varley, C. J. (1982). The Sedimentology and diagenesis of the Cadomin formation, Elmworth area, northwest Alberta (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/17848 | en_US |
| dc.identifier.doi | http://dx.doi.org/10.11575/PRISM/17848 | |
| dc.identifier.lcc | QE 186 V35 1982 | en |
| dc.identifier.other | NL Number: 63253 | en |
| dc.identifier.uri | http://hdl.handle.net/1880/22892 | |
| dc.language.iso | eng | |
| dc.publisher.institution | University of Calgary | en |
| dc.publisher.place | Calgary | en |
| dc.relation | Additional Copy: QE 186 V35 1982G Geology | en |
| dc.rights | University 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.lcc | QE 186 V35 1982 | en |
| dc.subject.lcsh | Geology - Alberta - Elmworth area | |
| dc.subject.lcsh | Diagenesis - Alberta - Elmworth area | |
| dc.title | The Sedimentology and diagenesis of the Cadomin formation, Elmworth area, northwest Alberta | |
| dc.type | master thesis | |
| thesis.degree.discipline | Geology and Geophysics | |
| thesis.degree.grantor | University of Calgary | |
| thesis.degree.name | Master of Science (MSc) | |
| ucalgary.thesis.additionalcopy | QE 186 V35 1982G Geology | en |
| ucalgary.thesis.notes | UARC | en |
| ucalgary.thesis.uarcrelease | no | en |