Navegando por Assunto "Profundidade"

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Acesso aberto (Open Access)
Avaliação do custo de construção em função do traçado da rede coletora de esgoto sanitário
(Universidade Federal do Pará, 2013-08-29) FERREIRA, Rômulo Henrique Alvarada; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
One of the main barriers to expansion of sewage system in the country is the high cost of implementation of sewage disposal system, as being directly related to depth. Considering this problem, this paper presents two different studies tracings collection network type absolute tab for the city of Santa Cruz Arari - Marajó - Pará, in order to find the smallest depth and consequently the best cost. First, we designed two stroke sewage disposal system in the area with the highest population concentration is scaled according to existing technical standards. From the quantitative surveys of each stroke, there were budget spreadsheets with the possibility to compare among themselves the best network cost. Although there was little difference in length between the two paths, the item is weighed more than the depth of the network along the stretch of arrival of Sewage Pumping Station, for example, the depth was 4.90m and 4.77 m for the Path 1 and Path to 2, respectively. Soon we had the best total cost was Trace 2, with a total value of R$ 908,329.11 versus R$ 1,021,818.11 in Trace 1, representing a savings of R$ 113,579.00 to the same location. According to the results obtained, it was possible to evaluate the study tracing sewage disposal system becomes important for any location, as in this case study, where the city presents great difficulties of access and reduced costs for system implementation sewage.
Acesso aberto (Open Access)
Joining diffraction filter and residual diffraction moveout to constructo a velocity model in the depth and time domains: application to a Viking Graben data set
(Universidade Federal do Pará, 2014-08-14) COLLAZOS GONZALEZ, Jaime Andres; FIGUEIREDO, José Jadsom Sampaio de; http://lattes.cnpq.br/1610827269025210
Diffracted seismic waves are generated by unsmooth structures in the subsurface with a size on the order of seismic wavelengths. Because the incident wave field can be significantly affected by these discontinuities, many important properties of the seismic events can be used to improve the velocity model building. In this thesis, we propose a practical approach to construct velocity models in the time and depth domains using diffractions. This methodology applies the plane wave destruction (PWD) filter jointly with the residual diffraction moveout (RDM) method to construct velocity models in time and depth domains. Our method does not depend on any requirements except for identifiable diffractions filtered from reflection events and an arbitrary initial velocity model as input. The post-stack migrated images (in the time and depth domains) are compared with the mi- grated images derived from conventional seismic processing steps. In both cases, we used post-stack Kirchhoff Migration. Beyond the to the need to identify and select the diffraction events in the post-stack migrated sections in the depth domain, the method has a very low computational cost of processing time. To reach an acceptable velocity model was less compared with conventional processing. The applicability of our methodology was verified using a real Viking Graben seismic dataset.
Acesso aberto (Open Access)
Migração Kirchhoff paraxial pré-empilhamento em profundidade com amplitudes verdadeiras
(Universidade Federal do Pará, 2015-08-31) MOREIRA, Marcio Fernando de Andrade; CRUZ, João Carlos Ribeiro; http://lattes.cnpq.br/8498743497664023
The seismic depth migration is one of the most important steps in the exploration of geologically complex process areas of the oil industry interest. To obtain a more realistic image of the structure, it needs is a great settings recovery process of the reflectors in the subsurface and efficient determination of reflection coefficients to characterize the oil and gas reservoirs. One of the techniques used to obtain the seismic image is the Kirchhoff migration method which can be greatly enhanced by appropriate weights, which when applied to amplitudes during the stacking diffraction provides an estimate of the reflection coefficients. In this work, we used the 2-D paraxial ray prestack Kirchhoff depth migration method. In the calculation step traveltimes makes use of second-order paraxial approximation, by which one can get a good approximation of the traveltimes in the mesh migration. The weights used during migration were calculated using the equations of dynamic radius and the extrapolation to the points of the mesh migration. Compared with the conventional Kirchhoff method, the results were quite satisfactory as regards the increase in image resolution of the reflectors as well as in obtaining the reflection coefficients. The efficiency of the proposed technique was tested on synthetic data type anticlinal geological structure and seismic data Marmousi.