Browsing by Author "Krause, Federico F."
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Item Open Access Biostratigraphic evaluation of a sequence bounding surface: The Cardinal/Leyland unconformity ("E5/T5 surface") in the Cardium Formation (Upper Cretaceous; upper Turonian - lower Coniacian) at Seebe, Alberta(Canadian Society of Petroleum Geologists, 1994) Krause, Federico F.; Hall, R. L.; Joiner, S. D.; Deutsch, K.B.Item Open Access Carbonate and siliciclastic deposition on a cold- and warm-water, wave-swept ramp: lower Carboniferous Mount Head Formation, Southwest Alberta and Southeast British Columbia(1993) Brandley, Richard Theodore; Krause, Federico F.Item Open Access Deformation and Fluidization During Early Diagenesis: Impact on the Sedimentology and Geochemistry of Deep Water Carbonate Deposits from the Middle Cambrian House Range Embayment, South-Western United States(2009) Haluszka, Alexander Matthew; Krause, Federico F.Item Open Access Depositional dynamics of middle Devonian deposits in the Elk Point Basin: Gilwood Mbr (Wood Mountain Fm), Nipisi Field, northcentral Alberta and Yahatinda Fm (Rocky Mountain Front Ranges)(1997) Williams, Caroline Audrey; Krause, Federico F.Sedimentologic, pedologic and geochemical data are integrated to interpret the Gilwood Mbr delta system in Nipisi field and its stratigraphic outcrop correlative, the Yahatinda Fm. Five papers are presented with an emphasis on the mudstones and carbonates comprising interfluve paleosols, lacustrine, shallow marine and peritidal deposits. Because paleosols are laterally extensive and mark significant time periods of subaerial exposure, they are useful for correlations, paleogeographic reconstructions and sequence stratigraphic analysis. Proving that these buried paleosols can be used for correlation purposed necessitates determining the conditions and time periods during which they formed. For the Gilwood Mbr this required using relative degradation of organic matter to determine maturity as standard geochemical methods showed paleosols as relatively homogeneous. Enigmatic dolocrete and calcrete within mudstone and sandstone host rock were interpreted as due to the interaction of pedogenic, vadose and phreatic processes. Lateral distribution of carbonates reflect paleogroundwater tables and show that groundwater flow was centripetal, into a fault controlled low within Nipisi field. The faulting associated with this low was related to resurgent tectonism of the Peace River Arch, which was a sediment source and possibly dissolution of salt in the underlying strata. This central low contained an ephemeral lake and created accommodation space for thicker sediments prior to and during Gilwood Mbr deposition. Tectonism, sediment supply and accommodation space within a transgressive systems tract are reflected by four progradational-aggradational parasequence sets overlain by a retrogradational parasequence. Each parasequence is comprised of a coarsening upward sandstone succession overlain by marine mudstones and paleosols. The delta system had a: (1) low slope delta plain, with shallow ephemeral, sandy braided channels; (2) dissipative, shoreline zone; and (3) delta front dominated by hyperpycnal flows. Correlation of paleosol chronosequences within the peritidal deposits of the Yahatinda Fm support its correlation to Gilwood Mbr deposits to the north. Deposition within a transgressive systems tract is supported by the observed sedimentology, however it is dissimilar to predicted idealized models of paleosol chronosequences.Item Open Access Dynamic casting and growth faulting: Dawson Creek Graben Complex Carboniferous-Permian Peace River Embayment, Western Canada(Canadian Society of Petroleum Geologists, 1990) Krause, Federico F.; Barclay, J. E.; Campbell, R. I.; Utting, J.Item Open Access Item Open Access Evolution of an Upper Cretaceous (Turonian) shelf sandstone ridge: analysis of the Crossfield - Cardium pool, Alberta, Canada(Blackwell Publishing, 1991) Krause, Federico F.; Nelson, D. A.Item Open Access Implied basement-tectonic control on deposition of Lower Carboniferous carbonate ramp, southern Cordillera, Canada(Geological Society of America, 1996-05) Brandley, R. T.; Krause, Federico F.; Varsek, J. L.; Thurston, J.; Spratt, D. A.Item Open Access Interwell Connectivity in Tight Formations(2018-05-03) Mirzayev, Mammad; Jensen, Jerry Lee; Clarkson, Christopher R.; Krause, Federico F.A significant amount of oil and gas are present in formations having permeability less than 0.1 md. Although these tight reservoirs typically have small well spacings, not all well pairs exhibit connectivity because of the reservoir heterogeneity. Measuring connectivity can improve model realism and identify important geological controls sufficiently that field management can be made more reliable. In this study, we use the Capacitance Model (CM) to evaluate interwell connectivity. In order to render the CM suitable for tight reservoirs, we modified the model by adding a pseudo-well (CM-PW). This modification lets us apply the model to any areal window of interest and cope with long-transient periods in the production well flow rates. The CM-PW was tested with several heterogeneous simulation cases, which revealed that calculated connectivities from the tight permeability reservoirs agreed with results from higher permeability cases with only minor errors (< 7%). We applied the CM-PW to selected waterflooded areas from the East Pembina (Cardium Formation) and the Forget North (Bakken Formation) fields. As a further improvement on the existing CM analysis, horizontal wells were included in our field analyses. In the East Pembina Field, we could identify the effects of net local principal stress and hydraulic fracturing proppant amounts on the interwell connectivity. Pre-stimulation interwell connectivities are consistent with the maximum horizontal stress direction. We found that a change in connectivity was directly proportional with proppant tonnage. Also, the effect of the conglomerate layer on connectivity was studied. We found that strongest pseudo well connectivities are directed to the conglomerate-bearing region and the connectivities were related to the formation flow capacity. Finally, we also observed connectivity behavior consistent with the expected sandbody extent as identified through geological studies. In the Forget North Field connectivity study, we correlated well-to-well connectivities with geological and seismic analyses. We found that the natural fracture intensity and the Lodgepole Formation aquifer may be causes of long distance connectivity. It is well known that the CM evaluation is affected by the formation diffusivity. Using the analogy with heat conduction, we propose a method to determine an “area of influence” for an injection well. The method includes recognition that, in addition to the diffusivity, the injection rate frequency content affects the area size. The method was applied to determine the areal window size for the CM-PW application in tight oil reservoirs. From simulated and field applications, we observed that the interwell distance at the connectivity limit is within 3 to 5% of the interwell distance estimated from the heat conduction-based method. The modified CM allows us to extend the application to important new reservoir cases. The two field studies once again show the important role of geological features on reservoir communication. Finally, the importance of the injection rate frequency spectrum on the CM measurement opens up a new understanding of the injection well influence in reservoir performance.Item Open Access Miscible displacement of crude oil by CO2/SO2 mixtures(Society of Petroleum Engineers Inc., 1987) Sayegh, S. G.; Krause, Federico F.; Fosti, J. E.Item Open Access MORON FAULT ZONE, NORTH-CENTRAL VENEZUELAN BORDERLAND: IDENTIFICATION, DEFINITION, AND NEOTECTONIC CHARACTER(Springer Verlag, 1984-09) Schubert, Carlos; Krause, Federico F.Item Open Access Paleoecology and paragenesis of lower silurian micrite-supported bioherms: East Point Member, Jupitor Formation, Anticosti Island, Quebec, Canada(2009) Derochie, John-Paul; Krause, Federico F.Item Open Access Paleosol chronosequences and peritidal deposits of the Middle Devonian (Givetian) Yahatinda Formation, Wasootch Creek, Alberta, Canada(Candian Society of Petroleum Geologists, 2000) Krause, Federico F.; Williams, C.Item Open Access Paleozoic stromatactis and zebra carbonate mud-mounds: Global abundance and paleogeographic distribution(Geological Society of America, 2004-03) Krause, Federico F.; Scotese, Christopher R.; Nieto, Carlos; Sayegh, Selim' G.; Hopkins, John C.; Meyer, Rudolf 0.Item Open Access Pedogenic-phreatic carbonates on a Middle Devonian (Givetian) terrigenous alluvial-deltaic plain, Gilwood Member (Watt Mountain Formation), northcentral Alberta, Canada(Blackwell Publishing Ltd., 1998-12) Williams, C. A.; Krause, Federico F.Item Open Access Penetrative calcretes and their stratigraphic implications: Comment and Reply(Geological Society of America, 1993-06) Hopkins, John C.; Krause, Federico F.Item Open Access Permeability anisotropy and heterogeneity of a sandstone reservoir analogue: An estuarine to shoreface depositional system in the Virgelle Member, Milk River Formation, Writing-On-Stone Provincial Park, Southern Alberta(Canadian Society of Petroleum Geologists, 2006) Krause, Federico F.; Meyer, R. O.Item Open Access Petrological geochemical and diagenetic characterization of carboniferous mud-mounds: Seal area and Normandville fields, Pekisko formation north-central Alberta, Canada(2007) Graham, Breanne Leigh; Krause, Federico F.Item Open Access Preserved organic matter and miospores in buried Middle Devonian (Givetian) paleosols: indicators of weathering, oxidation and maturity(Elsevier, 1996) Williams, C. A.; Hills, L. V.; Krause, Federico F.