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Structural framework and its influence on the Quaternary-age sequence architecture of the northern shelf of Trinidad and TobagoPunnette, Stefan Wayne 23 December 2010 (has links)
The North Coast Marine Area (NCMA) extends across ~7000 km2 of the northern
Trinidad and Tobago shelf in water depths between 50 to 200 meters. In 2009 the
NCMA had two exploration blocks under active oil and gas exploration with gas
production from the NCMA totaling ~ 1.1 tcf since 2002. All natural gas discovered to
date in the NCMA has been interpreted as biogenic although one previous worker has
speculated that a minor component of thermogenic gas is also present. The NCMA is
located within a complex tectonic environment characterized by oblique strike-slip
displacements between the Caribbean and South American plates at a rate of about 20
mm/yr. The main faults of the 200-km-wide plate boundary zone include: 1) the El Pilar right-lateral strike-slip fault zone to the south on the island of Trinidad and the Gulf of
Paria which GPS results indicate to be largely inactive; 2) the North Coast fault zone
(NCFZ) which coincides with the southern boundary of the Tobago basement terrane and
appears to be slightly active with down-to-the-north, Miocene to recent oblique-slip
movements on the NCFZ producing accommodation space for deposition of sediments
along the northern shelf of Trinidad and Tobago; and 3) the Hinge Line fault zone
(HLFZ) crossing through the NCMA and forming the focus of Chapter 2 of this thesis.
The ~120 km long Hinge Line fault zone has an average east-northeast strike
approximately parallel to the GPS-derived plate motion direction (080°), and is a subvertical,
thick-skinned right-lateral strike-slip fault. Localized zones of transpression and
transtension form locally where the trace of the fault deviates from the 080° direction of
pure, right-lateral shear and these localized areas of complex faulting and folding provide
important structural traps for Pliocene and Miocene gas reservoirs in the NCMA north of
the HLFZ. Growth sequences along the HLFZ indicate that the fault activated in Miocene
time and continues to up to the late Pleistocene (~500 k.y.) and in some areas forms
active scarps on the seafloor. Structural maps and isochron maps were made for four
horizons underlying the northern shelf of Trinidad including top Mesozoic basement, top
Miocene, top Pliocene and seafloor. These maps support a change in terrigenous source
area for the northern shelf of Trinidad: during the Miocene and early Pliocene,
terrigenous sources were coming from the southeast through the Atlantic Ocean; during
the mid-Pliocene to present the source area changed to the southeast through the Gulf of
Paria. The shallow seismic stratigraphic study of Chapter 3 analysed two Pleistocene
fourth-order shelf and shelf-edge stratigraphic sequences deposited over the past ~500 k.y
in the western part of the NCMA. New micropaleontologic data tied to a well through the
two sequences B and C constrain the initial deposition of each sequence ~450 k.y
(Sequence B) and ~260 k.y. (Sequence C). The lithologic well log shows that the
sequences are sand, shale, and thin limestone. Seismic interpretation allows division of
sequences B and C into eight system tracts which include: 1) lowstand system tracts, 2)
transgressive system tracts, 3) highstand system tracts and 4) falling stage system tracts.
Two lowstand systems tracts in sequences B and C are characterized by delta plain
deposition of the Orinoco Delta with a north-eastward terrigenous source direction
coming from the western side of Trinidad, through the Gulf of Paria. The falling stage
systems tract of sequence C consists of a suite of ~20 – 45-m-high, 0.1° – 0.25°-inclined,
and north-eastward-prograding muddy, shelf deltaic clinoforms marking the paleo-shelf
edge. Fault controls penetrate into Sequence B and may have produced accommodation
space but do not penetrate into overlying Sequence C which therefore must have been
eustatically controlled. These Pleistocene sequences may provide a more recent analog
for Miocene and Pliocene age sequences and reservoirs that form the highly productive
horizons of the NCMA gas field. / text
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Structural framework and seismic geomorphology of the Cretaceous beneath the Mad Dog Area, deep to ultradeep waters Gulf of MexicoMarkez, Damian 01 November 2013 (has links)
Recent drilling of deep stratigraphy in subsalt offshore Gulf of Mexico has revealed the presence of thick, amalgamated, Cretaceous siliciclastic reservoirs with the potential to become valid exploration targets. Similar to the Lower Tertiary deepwater play, the significant down-dip distance (> 400 km) from the source deltaics, the data gap across the modern structurally complex salt-tectonics-dominated slope and the difficulties of imaging subsalt stratigraphy pose challenges for the construction of meaningful deepwater system models to aid in exploration and appraisal efforts.
A 3D seismic dataset in the Mad Dog field at the basinward end of the modern allochthonous salt canopy and outboard of the Sigsbee Escarpment offers the opportunity to study the nature of the deep stratigraphy at central positions in the basin. The nature of the Cretaceous sedimentary system has been investigated through detailed structural and seismic geomorphologic mapping. An early syndepositional contractional event has been identified and temporally associated with Mesozoic emplacement of a deep salt sheet. These events are masked by the major Neogene-age phase of fold amplification that dominates the present-day subsalt structural framework. Ponded-basin deepwater sedimentation processes control early phases of deposition in the Cretaceous Mad Dog area and sediment-gravity flows are deposited as complexes of low sinuosity amalgamated channelized deposits in roughly-confined sediment pathways. Ponded fills show internal lateral accretion architectures that grow sigmoid in nature as the migrating systems interact with the approaching minibasin margins making evident the structural control on sediment architecture. Later phases of deposition are characterized by slightly sinuous feeder channels with multiple lobe development at their terminus. Variable directions of sediment source pathways indicate a linear-sourced slope apron depositional model for these systems. In addition to the more structured morphologic elements, there were also pervasive mass-transport processes active, presumably triggered by Mesozoic halokinesis. Data in sparse deep wells in the GoM that penetrate the Cretaceous suggest that the Late Cretaceous deepwater depositional system was composed of coarse-grained high density gravity flows. The geometries seen in seismic beneath the Mad Dog area support the existence of such a basinwardly extensive deepwater fan systems developed during the Cretaceous, and the low sinuosity channel geometries and small length:width ratio and amalgamated nature of fan lobes suggest that these systems may have indeed been high-density in nature. / text
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Crustal architecture of the Kiruna mining district : Structural framework, geological modeling, and physical rock property distributionVeress, Ervin Csaba January 1900 (has links)
Rapid technological advancements and growing environmental consciousness created a shifting dynamic of metal demand within the context of contemporary global challenges. The metals play a pivotal role in this transformation and remarkable surge in demand is expected. Mining districts such as the Kiruna area in northern Sweden, provide access to raw materials, assuring supply chain security, sustainability, and an environmentally friendly future. The district is part of the northern Norrbotten ore province, Sweden and is known for hosting the Kiruna-type iron oxide-apatite (IOA) deposits with associated magnetite-hematite-REE ores such as the Per Geijer deposits, and a range of other deposits, including the Viscaria Cu-(Fe-Zn), Pahtohavare Cu-Au and the Rakkurijärvi iron oxide-copper-gold (IOCG) deposits. As the discoveries of significant near-surface deposits are declining, mining companies face a pivotal choice between pursuing resource extraction from lower-grade reserves or to focus on deeper exploration targets. The geological understanding of the subsurface decreases with increasing depth, and the reliance on geophysical techniques becomes more important in reducing the search space. Using geophysics to locate and understand elements of a mineral system requires a good understanding of the physical and chemical properties of the rocks that can be translated into geological implications. Mineral system knowledge and geological concepts can be translated into geological models that can be further used in geophysical inversions with the aim of improving targeting by iterative modeling. A geophysical inversion is in fact a realization of a physical property model, therefore the value added by the geophysical model is dependent of how well the relationship between the geology and its petrophysical signature is understood. The petrophysical characterization of geological environments offers the possibility to improve the understanding of geophysical responses, serving as a link in iterative geological-geophysical modeling. The approach presented in the current study includes the building of three-dimensional lithological and structural framework models, and investigating the petrophysical footprint in connection with lithology, alteration, and rock fabric from the Kiruna mining district. Geological modeling and petrophysical characterization are important components within the comprehensive mineral system modeling framework and enhance geophysical investigations aimed at detecting and assessing iron oxide mineral systems. A rule-based hybrid implicit-explicit geological modeling technique proved to be useful in the integration of surface and subsurface data of the Kiruna mining district, and a structural framework and geological model was produced that provides insights into the relationship between lithological units and structures. Drill core observations indicate a competency contrast between lithological units confirming previous surface-based observations. Deposit scale structural analysis in connection with the geological models indicated the proximity of NW-SE to SW-NE trending brittle conjugate fault networks with iron-oxide apatite ore lenses, revealing juxtaposition of individual ore lenses. Complementing structural analysis and geological modeling, petrophysical characterization in connection with lithogeochemical, mineralogical, and textural investigations revealed that density and p-wave seismic velocity can be used as a general lithological indicator, while magnetic susceptibility is influenced by secondary processes. Heterogeneous strain accommodation by lithological units indicates a strong influence on density, seismic properties, and the ferromagnetic properties of the samples. Metasomatic processes alter the intrinsic properties of the samples by increasing or decreasing the physical properties of the rocks from the Kiruna area, by controlling the feldspar, mica, magnetite, and ferromagnesian mineral content. Nevertheless, an extensive sample population must be investigated to understand the large-scale effects. The present work serves as a foundation for quantitatively integrated exploration models that use geological models and petrophysical characterization as calibration tools to model mineral systems.
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Hur bra är vi på att använda våra helikoptrar? : En undersökning om Försvarsmaktens helikopterorganisationLundsten, Johan January 2013 (has links)
Med början på år 1995 slogs Flygvapnets-, Arméns- och Marinflygets respektive helikopterförband samman till en gemensam helikopterflottilj sorterandes under Flygvapnet. Äldre helikoptersystem byttes ut mot nya uppdaterade system för att bättre klara dagens uppgifter parallellt med att efterfrågan har ökat nationellt såväl som internationellt. Samtidigt som en statlig utredning säger att understöd med helikopter är av stor betydelse för Försvarsmaktens framtida användbarhet så har flera omorganisationer skett inom myndigheten, vilket riskerar att hämma effektiviteten. Hur lämplig är Försvarsmaktens nuvarande helikopterorganisation när det gäller helikoptersamövning mellan Helikopterbataljonen och övriga förband? Studien visar att dagens Försvarsmakt, där efterfrågan på helikoptrarna är större än de tillgängliga resurserna, använder sig av ett system med både styrningar från högre chef såväl som önskemål från förbanden. Detta organisationsval stämmer väl överens med de antaganden, hämtade ur Bolman & Deals teori Det strukturella perspektivet, som har utgjort arbetets teoretiska grund. I arbetet framkommer även att det saknas en försvarsmaktsgemensam erfarenhetsdatabas för dessa övningar vilket riskerar att utgöra en friktion i kunskapsspridningen mellan förbanden. / Beginning in 1995, the Swedish Air force’s, Army´s and Navy´s respective helicopter units merged into one Helicopter Wing belonging to the Air force. Older helicopter systems were exchanged to new, more updated systems with higher capability to cope with new demands. Today the use of helicopters has increased both nationally and internationally. While a state investigation says that the use of helicopters has a big role for the future use of the Swedish military, has several reorganizations taken place. Changes that may inhibit the efficiency of the Swedish Armed Forces. How suitable is today´s helicopter organization within the Swedish Armed Forces regarding to joint exercises between the Helicopter Battalion and other units? The study shows that today's organization, where the demand for helicopters is greater than the available resources, uses a hierarchical system that uses both directives from higher levels as well as requests from the different units. This organizational construction is consistent with the assumptions taken from Bolman & Deals theory Structural Framework, which has formed the theoretical ground for the study. The work also reveals the lack of a joint experience database for these exercises which might impede the spread of knowledge between the units.
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A structural framework of an agile development program of self-service business intelligenceRönnow, Daniel January 2014 (has links)
The established use of IT systems has increased the use of information in modern enterprises.From this information use, the concept of Business Intelligence has developed to enable more efficientand informed decision-making. As the business’ requirements of Business Intelligence reports changesrapidly due to changes of the business’ needs and more analytical organisations, traditional BusinessIntelligence development faces problems of ad-hoc analyses due to the inefficient adaption to changingneeds.This Master Thesis serves the purpose of deepen the understanding of the establishment of an agiledevelopment program of Self-service BI, addressing the concerns of more effectively meeting the changingrequirements of traditional Business Intelligence development. This study explores enablers through aqualitative case study, conducted at a Swedish bank, consisting of four group interviews discussing theestablishment of such program in Organisational, Processes, Technical and External dimensions,respectively. The qualitative case study was then followed by a discussion of governance of such programfor alignment to enablers.The qualitative case study resulted in 15 enablers of an agile development program of Self-Service BI,considering further enablers compared to more general literature of BI success factors, addressing theperspective of both an agile development program and Self-Service BI applications. The discussion ofgovernance of the program then identified eight governance mechanisms, which might align the programto the enablers, for successful establishment and development of applications.The findings of the study can be considered to culminate into a structure of an agile development programof Self-Service BI. The Thesis presents, from the findings, a framework for structuring such program,consisting of three development phases; Ordering process, Agile development, and Maintenance/Supportand Training, and with the discussed governance for steering the development.
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Senior centrum Žďár nad Sázavou / Senior centre in Ždár nad SázavouBrukner, Josef Unknown Date (has links)
The aim of this master thesis is to design home for the residential care of elderly and disabled people in Žďár nad Sázavou. It is designed as a three-storey building with a basement. There are technical facilities, in the basement. Canteen, doctor´s office, manager‘s office and reception are located on the first floor. Second and third floor contains common premises and residential units.building has a prefabricated reinforced concrete structural framework with mineral wool thermal insulation. It is covered with an extensive green roof. Piles are designed as the foundation. Partition wall is designed from plasterboard. The project and 3D rendering were carried out in Revit and Lumion software. All structures comply with the valid standards and regulations. The building site contains also an outdoor car park and a park.
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Evolu??o geodin?mica e condicionamento estrutural dos terrenos Pianc?-Alto Br?gida e Alto Paje?, dom?nio da zona transversal, NE do BrasilMedeiros, Vladimir Cruz de 30 November 2004 (has links)
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Previous issue date: 2004-11-30 / Companhia de Pesquisa de Recursos Minerais / This thesis aims to advance in the geological knowledge of the region comprising the Pianc?-Alto Br?gida (TPAB) and Alto paje? (TAP) terranes, in the Transversal Zone Domain (Borborema Province, NE Brazil), with the main objective of understanding the geodynamic evolution and the structural framework of these units. To reach this objective, and besides field work and interpretation of traditional aerial photographs, other tools were employed like of remote sensing products (Landsat 7 ETM+, aeroradiometrics, aeromagnetics and topographical images), lithogeochemical (whole rock) analyses and geochronological dating (U-Pb in zircon), besides integration with literature data. In the area, several precambrian geological units outcrop, represented in the TAP by the paleoproterozoic Serra Talhada and Afogados da Ingazeira complexes, Riacho Gravat? Complex (metavolcano-sedimentary sequence of Stenian-Tonian age) and Cariris Velhos orthogneisses (of Tonian age). The TPAB comprises the Santana do Garrote (lower unit) and Serra do Olho d'?gua (upper unit) formations of the Cachoeirinha Group (Neoproterozoic III), besides the Pianc? orthogneisses and Bom Jesus paragneisses; the latter correspond to an older (basement ?) block and a possible high grade equivalent of the Cachoeirinha Group (or Serid? Group ?), respectively. Several Brasiliano-age plutons occur in both terranes.The aeromagnetic data show the continuity, at depth, of the main shear zones mapped in the region. The Patos, Pernambuco, Boqueir?o dos Cochos, Serra do Caboclo, Afogados da Ingazeira/Jabitac? and Congo-Cruzeiro do Nordeste shear zones reach depths greater than to 6-16 km. The aeromagnetic signature of other shear zones, like the Juru one, suggests that these structures correspond to shallower crustal features. The satellite images (Landsat 7 ETM+) and aerogamaspectrometric images discriminate different geological units, contributing to the mapping of the structural framework of the region. The Serra do Caboclo Shear Zone was characterized as the boundary/suture between the TPAB and TAP. This structure is an outstanding, pervasive feature that separates contrasting geological units, such as the Neoproterozoic III Cachoeirinha Group in the TPAB and the Riacho Gravat? Complex and the Cariris Velhos metaplutonics, of Stenian-Tonian age, in the TAP. Occupying different blocks, these units are not found in authoctonous relations, like unconformities and intrusive contacts. Concerning the Cariris Velhos (ca. 1,0 Ga old) event is recorded by radiometric ages of the Riacho Gravat? Complex metavolcanics and intrusive augen and orthogneisses, all of them displaying geochemical affinities of arc or collisional settings. A structural signature of this event was not recorded in the region, possibly due to its low grade/low strain style, obliterated by the overprinting of younger, higher grade/high strain Brasiliano-age fabrics.The first tectonic event (D1) observed in the Cariris Velhos lithotypes presents contractional kinematics with transport to the NW. Neoproterozoic III geochronologic dates, obtained in late-D1 granitoids, imply a Brasiliano age (ca. 610-600 Ma) for this deformation event. The second tectonic event (D2) characterized in the region corresponds to the Brasiliano transcurrent kinematics of the outstanding shear zones and associated granitoid plutons. The geochronological (U-Pb in zircon) data obtained during this thesis also confirms the occurrence of the Cariris Velhos magmatic suite in the TAP, as well as the Neoproterozoic III age to the Cachoeirinha Group in the TPAB. The TAP (Riacho Gravat? Complex, augen and orthogneisses) is interpreted as a continental arc possibly accreted to a microcontinent during the Cariris Velhos (Stenian-Tonian) event. Later on, this terrane collided with the TPAB at the beginning of the Brasiliano orogeny (D1 contractional deformation), and both domins were reworked by the transcurrent shear deformation of the D2 event / A presente tese procurou avan?ar no conhecimento geol?gico da regi?o que abrange os terrenos Pianc?-Alto Br?gida (TPAB) e Alto paje? (TAP) , no Dom?nio da Zona Transversal (Prov?ncia Borborema, NE do Brasil), com o intuito principal de compreender a evolu??o geodin?mica e o condicionamento estrutural destas unidades. Para atingir este objetivo, al?m do trabalho de campo e da interpreta??o de fotografias a?reas tradicionais, foram utilizados outros produtos de sensoriamento remoto (imagens Landsat 7 ETM+, aeroradiom?tricas, aeromagn?ticas e topogr?ficas), an?lises litogeoqu?micas (rocha total) e data??es geocronol?gicas (U-Pb em zirc?o), al?m da integra??o com dados da literatura. Na regi?o afloram v?rias unidades geol?gicas precambrianas, representadas no T AP pelos complexos paleoproteroz?icos de Serra Talhada e Afogados da Ingazeira, Complexo Riacho Gravat? (seq??ncia metavulcanossedimentar de idade Esteniana-Toniana) e ortognaisses Cariris Velhos (Tonianos). No TPAB ocorrem as forma??es Santana do Garrote (unidade inferior) e Serra do Olho d'?gua (unidade superior) do Grupo Cachoeirinha (Neoproteroz?ico III), al?m dos ortognaisses de Pianc? e paragnaisses de Bom Jesus, estes dois ?ltimos podendo constituir um bloco mais antigo (embasamento ?) e um equivalente de alto grau do Grupo Cachoeirinha (ou Grupo Serid? ?), respectivamente. Em ambos os terrenos ainda ocorrem v?rios corpos degranit?ides brasilianos. Os dados aeromagn?ticos permitiram estimar a continuidade, em profundidade, das principais zonas de cisalhamento cartografadas na regi?o. As zonas de cisalhamento de Patos, Pernambuco, Boqueir?o dos Cochos, Serra do Caboclo, Afogados da Ingazeira/Jabitac? e Congo-Cruzeiro do Nordeste atingem profundidades . superiores a 6-16 km. A assinatura aeromagn?tica de outras zonas de cisalhamento, tais como a de Juru, sugere que tais estruturas correspondem a fei??es crustais mais rasas. As imagens de sat?lite (Landsat 7 ETM+) e aerogamaespectrom?tricas permitiram individualizar unidades geol?gicas distintas, bem como esbo?ar a trama estrutural da regi?o.A Zona de Cisalhamento Serra do Caboclo foi caracterizada como o limite/sutura entre o TPAB e TAP, tendo em vista ser uma estrutura marcante/penetrativa que separa unidades geol?gicas contrastantes, como o Grupo Cachoeirinha (Neoproteroz?ico III) no TPAB e o Complexo Riacho Gravat? (Esteniano-Toniano) e as metaplut?nicas Cariris Velhos, do TAP. Embora mais jovem, o Grupo Cachoeirinha n?o exibe contatos em n?o conformidade sobre o Complexo Riacho Gravat? ou ortognaisses Cariris Velhos, indicando que aquelas unidades estavam distanciadas quando da sua deposi??o. Com rela??o ao evento Cariris Velhos (ca. 1,0 Ga), a presen?a do mesmo ? indicada pelas metavulc?nicas do Complexo Riacho Gravat?, augen gnaisses e ortognaisses intrusivos, todos com afinidade geoqu?mica de contextos de arco ou colisional. Todavia, o registro estrutural associado a este evento n?o foi identificado, o que foi interpretado em fun??o de sua oblitera??o (constitu?am estruturas de baixo grau/baixo strain) pelos eventos subseq?entes. O primeiro evento tect?nico (01) observado nos litotipos de idade Cariris Velhos apresenta cinem?tica contracional com transporte para NW. Uma data??o do Neoproteroz?ico III, obtida em granit?ide tardi-D1, permite atribuir uma idade do in?cio do brasiliano para este eventodeformacional. O segundo evento (D2) caracterizado na regi?o corresponde ? tect?nica transcorrente Brasiliana, a qual ? materializada por marcantes zonas de cisalhamento e corpos gran?ticos associados. Os dados geocronol?gicos obtidos (U-Pb em zirc?o) confirmaram a presen?a do magmatismo Cariris Velhos no ?mbito do TAP, bem como a idade Neoproteroz?ica III para o Grupo Cachoeinha (TPAB) e para o evento tect?nico D1. O TAP (Complexo Riacho Gravat?, augen gnaisses e ortognaisses) deve constituir um arco continental (provavelmente acrescido a um microcontinente) formado durante o evento Cariris Velhos (Esteniano-Toniano). Este terreno colidiu com o TPAB no inicio da orog?nese brasiliana (deforma??o tangencial D1), sendo ambos os blocos afetados por retrabalhamento/cisalhamentos transcorrentes (evento D2) at? o final do Ciclo Brasiliano
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