Made available in DSpace on 2015-03-05T12:15:34Z (GMT). No. of bitstreams: 0 Previous issue date: 5 / Nenhuma / Neste trabalho foi feita uma análise tectono-estratigráfica em depósitos do início do rifte da Bacia de Sergipe-Alagoas, Nordeste do Brasil, cujos resultados foram aplicados à caracterização e modelagem de reservatórios. Escolheu-se como laboratório a área de Furado, um campo de petróleo maduro, por apresentar esses estratos de forma praticamente completa, além de dispor de uma grande quantidade de dados estáticos e dinâmicos. Aplicaram-se uma abordagem multidisciplinar (tectônica, estratigrafia e caracterização de reservatórios) e multiescalar (desde a contextualização dos depósitos na bacia ao zoneamento de produção dos reservatórios). As seqüências de 2ª ordem (K10-20 e K34-K36 correspondentes às formações Feliz Deserto e Barra de Itiúba/Penedo respectivamente) foram fatiadas em seqüências de 3ª ordem. A análise estratigráfica sugere que o início do processo de rifteamento ocorrido já na Seqüência J20-K5 (Formação Serraria) foi gradual ao longo de 20Ma. Esse processo é caracterizado tanto pela ausência de / In this work, the results of a tectonic-stratigraphic study on the early rift strata of the Sergipe-Alagoas Basin, northeastern Brazil, were applied to the characterization and modeling of reservoirs. Furado area, a mature oil field, was selected as laboratory because it presents these strata so nearly complete, and has lot of static and dynamic data. We applied a multidisciplinary approach (tectonics, stratigraphy and reservoir characterization) and also a multi-scalar approach (from the context of deposits in the basin to the zoning of producing reservoirs). The 2nd order sequences (K10-20 and K34-K36 corresponding respectively to the Feliz Deserto Formation and Barra de Itiúba/Penedo Formation ) were sliced into 3rd sequences. The stratigraphic analysis suggests that the beginning of rifting process that had already occurred in the Sequence J20-K5 (Serraria Formation) was gradual over 20 Ma. This process is characterized by the absence of a conspicuous unconformity of the onset rift in which the parallel

Thesis (M.S.)--Baylor University, 2005. / Includes bibliographical references (p. 142-147).

Bad Heart Formation oolitic ironstone is the largest resources of iron in western Canada. During this study, 45 new sections from outcrop, trench and drill holes were mapped, and 325 samples were collected for petrographic and geochemical analysis. The objective of the first paper is to refine the previously published stratigraphic model based on the new data. The second paper deals with geochemistry and discuss genesis of ooids and source of iron in oolitic ironstone. The textures of the Bad Heart Formation ironstone suggest the ooids formed in-place in a relatively shallow, wave-agitated, oxygenated marine environment with repetitive growth of the ooids in water column. There are two possible source of iron in the ooids. Some geochemical data indicate it is continental sedimentary, but it is also possible that the iron sourced from sub-sea hydrothermal or meteoric vents, similar to recent iron deposits at Paint Pots in Kootenay National Park.

The Ninetyeast Ridge (NER) is a ~5000 km-long aseismic volcanic ridge trending NS in the eastern Indian Ocean basin. It is widely accepted that NER formed from the trace of a single hotspot as the Indian plate moved northward during the Late Cretaceous and Early Cenozoic due to the linear age progression from 43 Myo at the southern end to 77 Myo at the northern end. What is not fully understood is the geologic history of the ridge since its formation. This study examines the stratigraphy and sediment thickness on the ridge using new seismic data to describe the sedimentary history of NER. More than 3700 km of 2D multichannel seismic reflection profiles were collected along NER at seven sites between 5.5 degrees N and 26.1 degrees S during cruise KNOX06RR of the R/V Roger Revelle in 2007. Scientific objectives were to obtain site survey data for proposed drilling and to understand the sedimentary layers, sediment distribution, and geologic history of NER. Seismic survey sites were chosen primarily based on proximity to existing Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) drill holes (Sites 758, 216, 214, and 253) for interpretation and correlation with existing lithologic data. Seismic data were processed (filtered, stacked, and time-migrated) and interpreted using standard seismic stratigraphy principles. Three major horizons were interpreted, correlated with those previously recognized at the DSDP and ODP sites, and traced throughout the seismic data. Seismic data were categorized into three units based on distinct acoustic properties including changes in reflector amplitude, wavelength, continuity, and geometry. Seismic Unit I comprises a succession of pelagic sediments and sedimentary rock draped over Seismic Unit II, which consists of pelagic carbonates mixed with volcaniclastics. Seismic Unit III is volcanic basement. Sediment layer thicknesses and distribution were mapped at each site, and bathymetric data were correlated with seismic data to interpret geologic features. Seismic and core data indicate a common sedimentary history at each site: volcaniclastic-rich sediments deposited during or shortly after ridge formation topped by a thick drape of pelagic sediments. This history likely happened in three stages over the last ~77 My: 1) the initial subaerial or submarine emplacement of the volcanic ridge, 2) the deposition of shallow water sediments and volcaniclastics, and finally 3) the subsidence of the ridge followed by deep water pelagic sediment deposition.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

No description available.

The supermature Middle-Late Ordovician Swan Peak quartz arenite was deposited on the western Laurentia passive margin and is very fine to fine grained, well-rounded, well-sorted, and silica-cemented. Laurentia was positioned over the equator during the Middle-Late Ordovician, suggesting that basement rock along the Transcontinental Arch was intensely eroded in a humid climate to produce this and other coeval quartz arenites. To determine provenance for the Swan Peak Quartzite, zircon grains were analyzed using LA-ICP-MS and the results were constrained within a sequence stratigraphic framework. Depositional environments of the Swan Peak Quartzite record an offshore-to-onshore transition with five facies (A-E). Facies A only occurs at the base of the Bear Lake section and may record an incised valley or localized embayment. It is the deepest water facies in the succession containing shale and quartz arenite interbeds. Facies B through E are interpreted as lower, middle, upper shoreface/foreshore depositional environments, respectively, based on primary sedimentary structures and bioturbation. Detrital zircon age spectra of the Swan Peak Quartzite have four distinct populations: the two main populations are at 1.8 - 2.0 Ga (Paleoproterozoic) and between 2.5 - 3.0 Ga (Archean), with a smaller, but persistent, population at 2.0 - 2.1 Ga, and a very minor 0.8 - 1.2 Ga (Mesoproterozoic) population occurring mainly in the tops of the measured sections. The base of each section has a larger Archean peak whereas the top of each section is predominantly Paleoproterozoic grains. Zircon data have overlap and similarity values ranging between 0.531 - 0.771 and 0.506 - 0.881, respectively, which indicates zircon age spectra of the Swan Peak Quartzite is similar to other Cordilleran Ordovician quartzites and that recycling of heterogeneous underlying sedimentary rocks was minimal. The Wyoming Craton (2.5 - 2.8 Ga) and the Trans-Hudson Orogen (1.8 - 2.0 Ga) provinces near the paleoequator likely provided the majority of zircons in the Swan Peak Quartzite. The source for the 2.0 - 2.1 Ga grains is currently unknown and the 0.8 - 1.2 Ga grains are interpreted to reflect Mesoproterozoic Laurentian tectonism. Sediment input varied in response to sea level fluctuations. Longshore transport was likely an important process in redistributing grains along the coastline during later deposition of the Swan Peak Quartzite.

A total of 186 samples taken from 9 offshore Central & Southern North Sea boreholes, 1 onshore XJK borehole, 2 onshore UK localities and 2 onshore Danish localities were processed and analysed for microfauna. A total of 273 individual taxa were identified - the majority to species level. The dominant microfaunal group recorded are the Foraminifera of which 23 genera were agglutinated, 75 calcareous benthonic and 21 planktonic. Other groups recorded are the Ostracoda which comprised 5 genera, Diatomacea 2 and Radiolaria 1. The recorded taxa are diagnosed and their stratigraphic and palaeoenvironmental significance discussed. The samples range in age from Late Cretaceous (Maastrichtian) through Paiaeocene (Danian & Thanetian) to Early Eocene (Ypresian) and occasionally Middle Eocene (Lutetian). The offshore boreholes are biostratigraphically zoned with respect to the published biozonation scheme of King, 1989, and the so-called 'bioevents' (i.e. microfossil marker horizons) described by Mudge & Copestake, 1992. The emphasis of the study was placed on the stratigraphical distribution of the microfaunas, particularly in the offshore realm where the majority of the boreholes (7) are located in the Southern North Sea area (Quadrants 44 and 49); a region lacking in previously published research on microfaunas of this age. The biozonation scheme of King, 1989, is found to be broadly applicable to all of the boreholes studied although some dififerences m detail were noted. Not all of the bioevents of Mudge & Copestake (1992) are recorded. The samples studied are insuflBciently closely spaced to permit the construction here of a separate biozonation scheme, specific to the Southern North Sea area, although it is considered that the future creation of such a scheme could be justified with additional data. A total of 53 individual microfossil marker horizons thought to have stratigraphic utility in the area are noted. The bulk of the Paiaeocene sediments deposited in the Southern North Sea area were laid down under moderate palaeodepths (c. middle shelf) and probably representative of the socalled 'outer sublittoral' biofacies of King, 1983. Evidence for progressive deepening of water depth towards the north of the area and mto the Silver Pit Basin was noted. The microfaunal assemblages from the offshore boreholes are similar in overall character to microfaunas recorded from onshore Palaeogene sections in the UK and Denmark.

Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: William L. Fisher. Vita. Includes bibliographical references.