Phanerozoic magmatism in the Parnaíba Basin: characterization of igneous bodies (well logs and 2D seismic sections), geometry, distribution and sill emplacement patterns

2018 ◽  
Vol 472 (1) ◽  
pp. 321-340 ◽  
Author(s):  
I. Trosdtorf ◽  
J. M. Morais Neto ◽  
S. F. Santos ◽  
C. V. Portela Filho ◽  
T. A. Dall Oglio ◽  
...  
Keyword(s):  
Well Logs ◽  
Seismic Sections ◽  
Parnaíba Basin

DIFFICULTIES IN THE USE OF DFA TO CHARACTERIZE PETROLEUM RESERVOIRS

2011 ◽  
Vol 22 (02) ◽  
pp. 123-131 ◽  
Author(s):  
R. A. RIBEIRO ◽  
MARIA V. M. MATA ◽  
K. C. O. COSTA ◽  
F. W. F. SILVA ◽  
L. S. LUCENA ◽  
...  
Keyword(s):  
Detrended Fluctuation Analysis ◽  
Gamma Ray ◽  
Petroleum Reservoirs ◽  
Oil Reservoirs ◽  
Well Logs ◽  
Fluctuation Analysis ◽  
Oil Reservoir ◽  
Detrended Fluctuation ◽  
Physical Quantities

In this work we have used the Detrended Fluctuation Analysis (DFA) technique to investigate an oil reservoir. The system we address here is situated at Bacia de Namorados, RJ, Brazil. The data corresponds to well logs of five geophysical variables: sonic, porosity, electrical resistivity, gamma ray and density measured in 56 wells. The objective of this work is to analyze the correlation or similarity among the DFA index of several geophysical quantities. We perform a linear correlation test to compare pairs of DFA indices of the geophysical quantities for the well logs. We have not found a major similarity among the five variables which indicates an absence of correlation for these variables. Therefore, we argue that the DFA index should be used with caution in the characterization of oil reservoirs. In this way we suggest to integrate the information of DFA of several physical quantities to adequately model this kind of system.

scholarly journals TECTONOSTRATIGRAPHIC CHARACTERIZATION OF THE ADJACENT PORTION TO THE SÃO VICENTE EARTHQUAKE EPICENTER IN THE SANTOS BASIN, BRAZIL

2015 ◽  
Vol 33 (3) ◽  
pp. 375
Author(s):  
Camila Schweig ◽  
João Carlos Dourado ◽  
Anderson De Souza
Keyword(s):  
Regional Scale ◽  
Passive Margin ◽  
Global Network ◽  
Contour Maps ◽  
Good Determination ◽  
Para Determinar ◽  
Seismic Sections ◽  
Basement Layer

ABSTRACT. The São Vicente earthquake, which had occurred in the Santos Basin, approximately 200 km from São Vicente city, São Paulo state in 2008, was well detected in the global network, allowing a good determination of their focal mechanisms and associated nodal planes, sub-horizontal (strike 82◦) and subvertical (strike 341◦). Understanding seismic, geological and geophysical data have been necessary to determine which nodal plane is the earthquake generating fault. Gravity anomaly maps and structural contour maps allowed defining structures on regional scale. It has been observed that the epicenter is located in the high portion of the slope next to a canyon feature and the aligned graben occurrence, the Merluza Graben, coincident with Capricorn Lineament occurrence. The seismic sections have shown that in the direction of the sub-horizontal plane, less significant faults have occurred when compared to the direction of subvertical plane where there have been faults that intersect from the basement layer to the Cenozoic layers, indicating that they were activated or reactivated on neotectonic events. The mapping of a normal antithetic fault to the NS direction quite significant along the data, has suggested that a horizontal trend of this fault plane might bind to the earthquake hypocenter.Keywords: intraplate seismicity, seismic, passive margin. RESUMO. O sismo São Vicente, que ocorreu na Bacia de Santos, a aproximadamente 200 km da cidade de São Vicente (SP) em 2008, foi bem detectado na rede mundial sismográfica, o que possibilitou uma boa determinação de seus mecanismos focais e planos nodais associados, sub-horizontal (strike 82◦) e subvertical (strike 341◦). Para determinar qual plano nodal representa a falha geradora do sismo é necess´ario o entendimento de dados sismológicos, geológicos e geofísicos. Mapas de anomalia gravimétrica e mapas de contorno estrutural permitiram definir estruturas em escala regional. Observa-se que o epicentro está localizado em um alto topográfico na porção do talude próximo a uma feição de cânion e à ocorrência de grabens alinhados, o Graben Merluza, coincidente com a ocorrência do Lineamento Capricórnio. As seções sísmicas mostram que na direção do plano sub-horizontal ocorrem falhas menos expressivas se comparadas à direção do plano subvertical onde ocorrem falhas que interceptam desde o horizonte do embasamento até os horizontes cenozoicos, o que indica que as mesmas foram ativadas ou reativadas em eventos neotectônicos. O mapeamento de uma falha normal antitética de direção NS, bastante expressiva ao longo dos dados, permite supor que uma tendência horizontal desse plano de falha poderia se vincular ao hipocentro do sismo.Palavras-chave: sismicidade intraplaca, sísmica, margem passiva.

scholarly journals Integration of NMR, Conventional Logs and Core Data to Improve Formation Evaluation of a Gas Reservoir in Kangan and Dalan Formation, Iran

2014 ◽  
Vol 5 (1) ◽  
pp. 154-168
Author(s):  
Ali Mohammad Bagheri ◽  
Mohammad Mohammadnia ◽  
Ghafor Karimi
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Well Logs ◽  
Logarithmic Mean ◽  
Reservoir Properties ◽  
Gas Reservoir ◽  
Technical Problems ◽  
Conventional Logs

Conventional log based reservoir characterization of a gas reservoir in the Kangan and Dalan formations have recently been improved by application of the nuclear magnetic resonance log (NMR).    Important reservoir properties such as permeability, pore size distribution and capillary pressure curves can be estimated from NMR. These parameters are simulated directly in the laboratory on core samples recovered from the reservoir. Due to high cost associated with coring and some technical problems, few wells in any given field are cored.    The only problem of NMR measurements in gas reservoirs is that in gas-bearing zones, total NMR porosity read much less than actual porosity due to low hydrogen index of the gas. This problem was solved by integration of NMR porosity with conventional well logs such as density and sonic and compared with core porosity. Improved porosity calculation lead to better core independent permeability estimation on the wells logged with NMR.     NMR T2 distribution was calibrated with laboratory derived pore size distribution in 7 samples and a constant scaling factor was derived for each rock type to predict a pseudo pore size distribution from NMR. Logarithmic mean of pore size distribution in 4 wells with NMR was integrated with conventional logs in an artificial neural network to predict a pseudo pore size distribution logarithmic mean (PPSDLM) in the wells without NMR.    PPSDLM and conventional well logs were involved to an electrofacies modeling to predict electrofacies in the reservoir for characterization of heterogeneity of the reservoir in 3D geological model. NMR permeability was also imported to the model as an associated log to predict facies base permeability.    To test the permeability prediction, estimated permeability was compared with core derived permeability on 2 cored wells to see how well, estimated permeability fitted the actual core permeability.

Use of rare earth elements and internal transition elements for characterization of the depositional paleo environment in samples of the experience of the Pimenteiras Formation, Parnaíba Basin, Brazil

2021 ◽  
Vol 106 ◽  
pp. 103104
Author(s):  
Rui Jesus Lorenzo Garcia ◽  
Jucelino Balbino da Silva Júnior ◽  
Ilene Matanó Abreu ◽  
José Roberto Cerqueira ◽  
Eliane Soares de Souza ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Transition Elements ◽  
Internal Transition ◽  
Parnaíba Basin

LIBRARY INFORMATION SERVICES FOR EXPLORATION COMPANIES

1973 ◽  
Vol 13 (1) ◽  
pp. 91
Author(s):  
Marita D. Keenan ◽  
Patricia B. Lapworth
Keyword(s):  
Information Needs ◽  
Technological Development ◽  
Financial Economic ◽  
Petroleum Exploration ◽  
Well Logs ◽  
Aerial Photographs ◽  
Wide Field ◽  
The Status ◽  
Special Library ◽  
Seismic Sections

The increased pace of scientific research and technological development since the Second World War has resulted in an "explosion" in the amount of information being produced in scientific and technical fields. It has been calculated that the published literature of these fields doubles every ten years. Most industries have been affected by this and the petroleum exploration industry is no exception. Exploration companies are prolific producers of information, particularly that resulting from their field operations.The information needs of the management and technical staff of exploration companies cover a very wide field of diverse material, which includes legal, financial, economic, industrial and statistical material, as well as geological and geophysical data and its interpretation. Relevant external material includes information on exploration methods and equipment, laws and regulations governing exploration in Australia, and the status and activities of competitors in the industry. All this comes from many and varied sources, and may be in conventional forms (books, journals, maps, etc) or in forms peculiar to the exploration industry itself (e.g. seismic sections and well logs). Internal information is even more complex in content and form, comprising field data of all kinds, reports, maps and diagrams, seismic sections and records, well logs, aerial photographs, and many other items.The difficulties presented by such a mass of varied and complex material are best overcome by the establishment of a "special library" in the charge of a professional librarian. A "special library" is one serving a specialist clientele and covering a particular field of knowledge. Professional librarians - or information officers - have been trained to gather, index, store, retrieve and disseminate information of all kinds; these tasks comprise the routine work of a special library. They are performed by adapting the standardised guidelines of librarianship to suit the specialised nature of the industry being served. Librarians are also trained in such tasks as literature research and compilation of information dossiers.The establishment of a special library under a qualified librarian provides an exploration company with:a centre for the integration of all kinds of information material; andan active information service.It thus enables a company to make the maximum use of all available information which may be relevant to its purposes.

Sign in / Sign up

Export Citation Format

Share Document