The Bow City Structure Southern Alberta Canada The Deep-PDF Free Download

The Bow City structure southern Alberta Canada The deep
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2 P Glombick et al, highly eroded buried under sediment or a combination Peerless Montana The Red Wing Creek structure is. of these If there is no obvious surface expression worth particular mention as high quality 3 D seismic. discovery of impact structures relies to a large degree on volumes have recently been presented by Herber 2010. serendipity as they are only apparent through careful The resulting images reveal complex patterns of thrust. geological mapping or perhaps more commonly and normal faulting across the Red Wing Creek. through anomalous geophysical responses structure in particular within the central uplift. The progressive mapping of sedimentary basins by We present evidence for a newly discovered probable. seismic methods particularly using modern 3 D impact structure near the village of Bow City Alberta. techniques has accelerated the discovery of possible This structure is interesting because of dense well control. impact structures in recent decades There are now that allows detailed subsurface stratigraphic mapping. numerous examples of possible buried impact structures Anomalies in the depths and thickness of various. many of which were inadvertently discovered through stratigraphic units mapped in the shallow subsurface led. anomalous borehole or geophysical responses e g to its detection Glombick 2010 Subsequent field. Pilkington and Grieve 1992 Stewart 2003 French and mapping of deformed bedrock exposed at surface and the. Koeberl 2010 The first of these may have been the analysis of seismic data across the structure further. 25 km diameter Steen River structure located in northern support a geometry consistent with an impact origin The. Alberta The central uplift was drilled as a prospective structure appears to be deeply eroded below the level of. hydrocarbon trap on the basis of early seismic profiling in the initial transient crater but despite this there is still. the 1950s Carrigy and Short 1968 A number of large evidence for displacement of fault blocks associated with. structures not all of which are confirmed impact central uplift and normal faulting with block rotations. structures have been discovered using extensive 2 D within the annulus of the structure Observations of such. marine seismic surveys including Mj lnir Gudlaugsson deeply eroded structures are relatively rare in the. 1993 Silverpit Stewart 2005 Chesapeake Bay Poag literature and as such this structure may provide new. 1996 Montagnais Jansa et al 1989 and Toms Canyon constraints on the mechanics of impact in stratified. Poag and Poppe 1998 The Chicxulub structure siliciclastic target rocks. however remains perhaps the best example of a large. buried impact structure the first hints of which came LOCATION AND GEOLOGICAL SETTING. from scarce core material with the architecture being. subsequently refined using magnetic and gravity surveys The Bow City structure is located in southern. Hildebrand et al 1991 followed by seismic Alberta centered at approximately 50 45 N and. investigations Bell 2004 and deep drilling Kenkmann 112 36 E Fig 1 Regional structure in southern. 2004 Stoeffler 2004 Geophysical methods have also Alberta is dominated by the northern margin of the. been used to delineate older more deformed impact Kevin Sunburst dome The Bow Island Arch extends. structures most notably Sudbury Milkereit 2010 north eastward from the dome separating the Alberta. The Western Canada Sedimentary Basin hosts and Williston basins which together form the Western. numerous confirmed and possible impact structures Canada Sedimentary Basin Fig 1 In the vicinity of. Fig 1 most of which were discovered during seismic the Bow City structure the regional dip of strata is. exploration for oil and gas e g Sawatzky 1975 1976 gently to the northwest 0 2 toward 310. Several of these including James River Isaac and The strata of the Alberta Basin can be divided into. Stewart 1993 Hotchkiss Mazur 1999 and Purple two broad successions a Cambrian to Jurassic. Springs Westbroek 1997 in Alberta and Hartney in carbonate dominated platformal succession overlying. Manitoba Anderson 1980 are examples of buried Precambrian basement and a Lower Cretaceous to. structures that were identified using seismic surveys and Paleocene succession of clastic sedimentary rocks. which have not yet been confirmed as impact structures deposited in a foreland basin adjacent to the Canadian. through drilling and identification of evidence for Cordilleran orogen Fig 1. diagnostic shock metamorphism see French and The youngest rocks exposed in the vicinity of the. Koeberl 2010 Confirmed impact structures within the Bow City structure are Upper Cretaceous nonmarine to. Western Canada Sedimentary Basin and the adjacent marginal marine clastic sedimentary rocks of the. northern United States that have been delineated using Horseshoe Canyon Formation Figs 2 and 3 There is a. seismic and well data include Viewfield Saskatchewan transitional contact between sandstone mudstone and. Elbow Saskatchewan Maple Creek or White Valley coal of the Horseshoe Canyon Formation and shale of. Saskatchewan Eagle Butte Alberta Cloud Creek the underlying Bearpaw Formation The Bearpaw. Wyoming not shown in Fig 1 Newporte North Formation is underlain by marginal marine to nonmarine. Dakota Red Wing Creek North Dakota and clastic sedimentary rocks of the Belly River Group. Bow City A deeply eroded complex impact structure 3. Fig 1 Simplified geological map showing the location of the Bow City structure black star relative to other selected confirmed. black circles probable gray circles and possible white circles impact structures in the Alberta and Williston basins. Approximate diameter in km indicated in brackets for each structure Impact location data from the Earth Impact Database. http www passc net EarthImpactDatabase index html and Rajmon 2009 Specific references for structures include Viewfield. Sawatzky 1972 1977 Isaac and Stewart 1993 Grieve et al 1998 Elbow De Mille 1960 Grieve et al 1998 Maple Creek. White Valley Whitaker 1976 Gent et al 1992 Westbroek 1997 Grieve et al 1998 Eagle Butte Haites and van Hees 1962. Sawatzky 1976 Hanova et al 2005 Cloud Creek Stone 1999 Stone and Therriault 2003 not shown Newporte Clement and. Mayhew 1979 Koeberl and Reimold 1995 Red Wing Creek Brenan et al 1975 Koeberl et al 1996 and Peerless Comstock. et al 2004 KS Kevin Sunburst dome Base map modified from Mossop and Shetsen 1994 their fig 1 1. In southern Alberta the Belly River Group can be 1993 The Oldman Formation can be divided into an. subdivided into three formations From youngest to upper siltstone unit and a basal sandstone unit the. oldest these are the Dinosaur Park Oldman and base of which forms the upper contact of the underlying. Foremost formations Fig 3 The Dinosaur Park Foremost Formation Hamblin 1997 The Foremost. Formation consists of an overall fining upward Formation is comprised of a heterolithic succession of. succession of marginal marine to estuarine fine grained marginal marine sandstone siltstone mudstone and. sandstone siltstone and mudstone with the thin coal coal Near the top of the Foremost Formation an. seams of the Lethbridge coal zone in the uppermost interbedded succession of coal mudstone and bentonite. part of the formation A regional disconformity forms the Taber coal zone The McKay coal zone is. separates the Dinosaur Park Formation from the found near the base of the Foremost Formation. underlying Oldman Formation Eberth and Hamblin overlying the basal Belly River sandstone Fig 3. 4 P Glombick et al, Fig 2 Simplified geological map in the vicinity of the Bow City structure modified from Irish 1968 Outline of the structure. based on subsurface structure maps is shown as black dashed line Location of seismic lines shown as solid dark gray lines The. locations of structure cross section A B wells are shown as gray filled circles Also shown are the locations of wells 100 07 30. 017 18W4 0 07 30 and 00 13 22 018 19W4 0 13 22 referred to in the text white filled circles Highway Hwy 537 shown as. thick solid black line Map grid coordinates are UTM Zone 12 NAD 83 datum. Mudstone of the Pakowki Formation underlies the Underlying the Milk River Formation is the Colorado. Belly River Group It drapes a regional unconformity at Group a thick marine shale succession with several. the top of the Milk River Formation with relatively regressive sandstone dominated units including the. minor relief known as the Milk River shoulder so Medicine Hat Member of the Niobrara Formation as. called because of the distinctive shoulder like log well as the Bow Island Formation situated near the. signature visible on sonic density and resistivity logs base of the Colorado Group Between the base of the. Bow City A deeply eroded complex impact structure 5. Fig 3 Schematic stratigraphic column for the Bow City area center showing detailed Belly River Group stratigraphy left. and matching geophysical log response for representative well 00 13 22 018 19W4 0 13 22 right The location of well 13 22 is. shown in Fig 2 Geophysical well logs include gamma ray GR and sonic Stratigraphic picks on geophysical log shown in blue. Colorado Group and the unconformity at the base of SUBSURFACE MAPPING. the Cretaceous lies a complex and laterally variable. assemblage of Lower Cretaceous clastic sedimentary The combination of abundant oil and gas well data. rocks known as the Mannville Group In the vicinity of in the area and a well defined stratigraphic succession. the Bow City structure the Mannville Group rests with permit the overall geometry of the Bow City structure. angular unconformity on Mississippian carbonate rocks to be constrained in the subsurface using a combination. of the Rundle Group of structure and isopach maps Following the. 6 P Glombick et al, Fig 4 Detailed map of the Bow City structure area showing well control Surface location of wells shown as gray filled circles. Surface location of cross section wells shown as solid black circles Outline of the structure based on subsurface structure maps. is shown as black long dashed line The location of outcrop control data used in gridding shown as white filled triangles The. approximate outer boundary of the central uplift defined using the 710 m structure contour on the Belly River Group top is. shown as a black short dashed line The inferred contact of the inlier of Dinosaur Park Formation rocks is shown in the center. of the structure approximated using the 820 m structure contour Township grid shown as solid black line The location of. seismic lines shown as solid dark gray lines Map grid coordinates are in UTM Zone 12 NAD 83 datum Twp township. Rge range W4 west of the Fourth Meridian, identification of a structural anomaly on the Belly River well logs using IHS Petra software A suite of logs. Group top Glombick 2010 we examined data from all including gamma ray neutron porosity resistivity. wells in the surrounding area n 2930 Figs 4 and 5f sonic and either bulk density or density porosity was. Stratigraphic tops were picked on downhole geophysical used whenever possible We screened well data for. Bow City A deeply eroded complex impact structure 7. Fig 5 Structure maps for selected stratigraphic tops a Belly River Gp b Foremost Fm c Pakowki Fm d Milk River. shoulder e Medicine Hat Mbr and f map showing the location of all oil and gas wells black circles in the area Structure. outlined in blue location of seismic lines shown as red lines Wells with data used in the creation of individual grids are. indicated with white circles a e Contour interval in meters above sea level is indicated for each map at top right Data were. gridded using Petra minimum curvature algorithm with a cell size of 200 m by 200 m Well directional survey data were used. to calculate X and Y map coordinates in deviated wells Map grid coordinates are UTM Zone 12 NAD 83 datum. 8 P Glombick et al, potential errors in kelly bushing elevation and missing are either not available or log signatures are obscured.
deviated survey data which could produce apparent by surface casing At least some of the variation is. structural anomalies For deviated wells well directional geologically meaningful however as indicated by. survey data were used to calculate X and Y location examination of the available well control within the. data along the well bore at depth for both structure and remainder of the depression Fig 5a This variability. isopach maps For isopach maps the XY location of may indicate a degree of structural complexity in this. the well bore at the upper surface was used For well region of the structure that cannot be resolved using. 00 01 26 17 018W4 0 Hudson s Bay Oil and Gas existing well data. Eyremore 1 located within the center of the structure The structure on the top of the Foremost. Fig 4 well 01 26 a published litholog based on Formation is broadly similar in geometry to the. cuttings was the only available data Powers 1931 As structure on the top of the Belly River Group There is. such only selected major lithostratigraphic contacts a clearly defined semicircular central uplift surrounded. could be picked in this well We used two additional by a structural low of variable depth with the lowest. control points on the east side of the central uplift area areas located north and east of the central uplift. in creating structure maps for the top of the Belly River Fig 5b At the stratigraphic level of the Pakowki. Group based on X Y and Z elevation data from Formation top Fig 5c. The Bow City structure southern Alberta Canada The deep roots of a complex impact structure Paul GLOMBICK1 5 Douglas R SCHMITT2 Wei XIE2 Todd BOWN2 3 Ben

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