Using 3-D Seismic Data to Investigate Tectonic Controls on Middle Devonian Reef Development, North-Central Alberta, Canada

1996 ◽  
pp. 280-294
Keyword(s):  
Seismic Data ◽  
Middle Devonian ◽  
North Central ◽  
Reef Development

scholarly journals From carbonate platform to euxinic sea – the collapse of an Early/Middle Devonian reef, Cantabrian Mountains (Spain)

Geologos ◽  
2017 ◽  
Vol 23 (3) ◽  
pp. 143-161 ◽  
Author(s):  
Gerard B.S. van Loevezijn ◽  
J.G.M. Raven
Keyword(s):  
Middle Devonian ◽  
Carbonate Platform ◽  
Cantabrian Mountains ◽  
Offshore Area ◽  
Major Phase ◽  
Reef Development ◽  
Facies Associations ◽  
Storm Wave ◽  
Geophysical Investigations ◽  
Reef Decline

AbstractThe Santa Lucía Formation represents the major phase in Devonian reef development of the Cantabrian Zone (Cantabrian Mountains, northwest Spain). In the present study the transition from the carbonate platform deposits of the Santa Lucía Formation to the overlying euxinic basinal deposits of the Huergas Formation is described. These transitional strata are connected to the Basal Choteč Event and represent a condensed sedimentation of micritic dark-grey and black limestones with an upward increase of dark shale intercalations with iron mineralisation surfaces and storm-induced brachiopod coquinas. The transitional beds are grouped into a new unit, the Cabornera Bed, which consists of limestone, limestone-shale and shale facies associations, representing a sediment-starved euxinic offshore area just below the storm wave base. Four stages in reef decline can be recognised: a reef stage, an oxygen-depleted, nutrient-rich stage, a siliciclastic-influx stage and a pelagic-siliciclastic stage. Additional geochemical and geophysical investigations are needed to verify the results presented herein.

Conodonts from the Middle Devonian Plum Brook Shale of north-central Ohio

1995 ◽  
Vol 69 (6) ◽  
pp. 1123-1139 ◽  
Author(s):  
Dale R. Sparling
Keyword(s):  
New Species ◽  
Adaptive Radiation ◽  
Middle Devonian ◽  
Considerable Part ◽  
Type Region ◽  
North Central ◽  
Index Species ◽  
Conodont Fauna ◽  
Three New Species

The Plum Brook Shale of north-central Ohio lies disconformably between the Eifelian (lower Middle Devonian) Delaware Limestone and the middle Givetian (upper Middle Devonian) Prout Dolomite. Its diverse conodont fauna indicates that it represents a transgression into the area in earliest Givetian time accompanied by the products of a notable adaptive radiation within two lineages ofIcriodus.One of these (I. expansusGroup) includesI. expansus, I. arkonensisandI. brevis, and complete intergradation of forms suggests that the group at this level involves conspecific ecotypes. A more extensive radiation involved descendants ofI. regularicrescens(I. regularicrescensGroup), including three new species,I. eriensis, I. janeaeandI. ohioensis.Other representatives of this lineage occur here as well as in strata of comparable age in the type region of the Givet Limestone as described by Bultynck (1987). A third lineage is represented byI. excavatusin both areas, but evidence of radiation within this branch is limited to the Givet Limestone. Remarkable diversity also occurs among forms considered herein to involvePolygnathus pseudofoliatusand its descendants. The existence of intermediate forms and shared characteristics between and among the various species, including some that first appeared well before the end of the Eifelian, implies that they may be conspecific ecotypic variants at this level. New morphotypes within this group are treated informally. The greatest overall diversity occurs just above the basal Plum Brook, in strata interpreted to reflect inner-sublittoral conditions. The entire Plum Brook belongs to the upperensensisZone. A considerable part of the type Givetian placed in the LowervarcusSubzone by Bultynck (1987) lies below the lowest occurrence of its index species (P. timorensis); it contains some of the species found in the Plum Brook, and much of this section may also belong to theensensisZone.

Conodonts from the Prout Dolomite of north-central Ohio and Givetian (upper Middle Devonian) correlation problems

1999 ◽  
Vol 73 (5) ◽  
pp. 892-907 ◽  
Author(s):  
Dale R. Sparling
Keyword(s):  
New York ◽  
New Species ◽  
North America ◽  
Middle Devonian ◽  
Taxonomic Status ◽  
Middle Part ◽  
North Central ◽  
Continuous Sedimentation ◽  
Stratotype Section ◽  
A New Species

The Prout Dolomite of north-central Ohio lies disconformably above the lowest Givetian (upper Middle Devonian) Plum Brook Shale and below the lowest Famennian (upper Upper Devonian) Ohio Shale. A sample from its base yielded over 4,000 diverse conodont specimens. Included isPolygnathus ansatusZiegler and Klapper, 1976, the index species for the MiddlevarcusSubzone, which is not reported from strata of this age in Ontario and Indiana, a fact that long caused their miscorrelation with the LowervarcusSubzone. Also present isP. rhenanusKlapper, Philip, and Jackson, 1970, considered to be also indicative of the MiddlevarcusSubzone in North America, andP. ovatinodosusZiegler and Klapper, 1976. Lowest occurrences of the latter are in the middle part of this subzone; its presence indicates correlation with the lower Tully Limestone of New York, the basal unit of the Taghanic Series. The Prout and equivalent strata in the region therefore represent a long unrecognized continuous time-rock unit created by Johnson's (1970) Taghanic onlap. The collection includes a new species ofAncyrolepis, A. huntleyi; a new species ofPolygnathusis left in open nomenclature, as are nine specimens assigned toTortodusbut of otherwise uncertain taxonomic status.Givetian conodont correlation between North America and the Global Stratotype Section and Point established by the Subcommission on Devonian Stratigraphy (SDS) in Morocco is extremely problematical because of relatively erratic distribution (probably owing to limited ecologic adaptability) ofP. ansatusandP. hemiansatusBultynck, considered herein to be an early morphotype ofP. ansatus.The base of the Givetian Stage has been defined by the SDS as coinciding with the lowest occurrence ofP. hemiansatus.The only possible evidence for the SDS'shemiansatusZone in North America involves reported occurrence of that morphotype in the uppermost Arkona Shale of Ontario, a position above the top of the Plum Brook Shale, which has been considered to be of Givetian age for decades. Also it appears that the interval between the Eifelian (lower Middle Devonian)kockelianusZone and thehemiansatusZone at the SDS's global-stratotype section in Morocco is of questionable age and probably too thin to represent continuous sedimentation. Adoption of a widely recognized faunal break at the base of strata deposited during the If T-R cycle of North America and Europe as the base of the Givetian could provide a sound alternative.

Integration of completion data, microseismic data, downhole logs, and multicomponent seismic data in the Mississippi Lime, north-central Oklahoma

2015 ◽  
Vol 34 (12) ◽  
pp. 1468-1473 ◽  
Author(s):  
Scott Singleton ◽  
Shihong Chi ◽  
Crystal Lapaire ◽  
Lisa Sanford ◽  
Paul Constance
Keyword(s):  
Seismic Data ◽  
North Central ◽  
Microseismic Data ◽  
Multicomponent Seismic ◽  
Mississippi Lime

THE PLEASANT CREEK ARCH, ADAVALE BASIN, A MID DEVONIAN TO MID CARBONIFEROUS THRUST SYSTEM

1988 ◽  
Vol 28 (1) ◽  
pp. 208 ◽  
Author(s):  
David Remus ◽  
Karen Tindale
Keyword(s):  
Seismic Data ◽  
Tectonic Evolution ◽  
Middle Devonian ◽  
Structural Evolution ◽  
Fold Belt ◽  
Mountain Ranges ◽  
Thrust Front ◽  
Thrust System ◽  
Three Stages ◽  
Back Arc

Interpretation of recently acquired multifold seismic data has led to a reappraisal of the structural evolution of the Adavale Basin with particular reference to the Pleasant Creek Arch.The Basin initially formed as a back arc basin to the west of the Anakie/Nebine volcanic arc. Three stages of tectonic evolution are recognised; rifting, extension and convergence. The Pleasant Creek Arch represents a foreland fold belt cratonward of the major convergent margin deformational zone.The model proposed for the development of the Pleasant Creek Arch is a buried to weakly emergent foreland thrust system modified by Late Carboniferous erosion. This was subsequently covered by sediments of the Galilee and Eromanga Basins. Late to Middle Devonian sediments are involved in thrusting that exhibits two styles of deformation. Along the southern 70 km of the thrust front Lower to Middle Devonian sediments are thrust under an upper decollement forming a passive roof duplex or backthrust zone. The Boree Salt acts as this upper decollement. The thrust tipline is controlled by the western depositional edge of the salt. North of this area the thrust appears to have been weakly emergent. Proprietary and open file seismic data from ATP's 301P, 304P and 305P and surrounding permits are used to illustrate the model. Comparisons can be made between this model and similar thrust systems in the Canadian Rocky and Mackenzie Mountains, the Appalachian Plateau, the Southern Norwegian Caledonides, the Kirthar and Sulaiman Mountain ranges of Pakistan and the Papua New Guinea fold belt.

scholarly journals SEISMIC ATTRIBUTES AIDED DETECTION OF NW-SE TRENDING FAULTS DEVELOPED ON AN ISOLATED CARBONATE PLATFORM IN THE NW SIRTE BASIN, NORTH CENTRAL LIBYA

2021 ◽  
Vol 5 (11) ◽  
Author(s):  
Muneer Abdalla
Keyword(s):  
Seismic Data ◽  
Carbonate Platform ◽  
Median Filter ◽  
Random Noise ◽  
Seismic Attributes ◽  
Structural Features ◽  
North Central ◽  
Field Development ◽  
Sirte Basin ◽  
Upper Paleocene

The lower and upper Paleocene reservoir formations, the primary producing formations in the northwest Sirte Basin, north-central Libya have complex structures which have an impact on the performance of the reservoirs. It is extremely crucial to understand the complex relationships between the fault networks and stratigraphy of the area for future field development. However, delineating faults particularly subtle faults is not an easy process due to the low signal-to-noise ratio in the post stack seismic data despite the effort and careful process of the pre-stack data. Seismic attributes are critical tools in detecting and enhancing major and minor fault interpretation beyond the seismic resolution of the conventional seismic dataset. This study utilizes variance, root mean square, and curvature attributes computed from the post-stack 3D seismic data acquired in the northwest Sirte Basin to detect major and minor faults along an isolated carbonate platform. A spectral whitening and median filter were applied to improve the quality of the data and remove random noise resulted from data acquisition and processing steps. Those methods were utilized to provide high-resolution seismic data and better show edges and structural features. Numerous faults have been detected in the study area. Most major faults in the lower and upper Paleocene reservoir formations are located along the margins of the isolated carbonate platform and have a NW-SE trend. Data conditioning and seismic attribute analyses applied on the 3-D seismic dataset effectively enhanced our understanding of the reservoir complexity and improve the detection of the major and minor faults and fracture zones in the study area.

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