Seminario

Seismic indicators of petrophysical properties

Data: 
Martedì, 19 Aprile, 2016 - 16:30
Aula: 
Aula Arduino
Relatore: 
Prof. Alfredo Mazzotti
Abstract: 

Geophysicists and geologists have the task of inferring the geometry and the petrophysical characteristics of the subsurface targets from the information brought by seismic observations.  Therefore, they are challenged by an inverse problem: by examining the seismic response, which is controlled by the reflectivity properties, they try to estimate the depth geometry and the petrophysical nature of the deep geological structures. Note that even approximate estimates of parameters such as porosity, fluid saturation, clay content, fracture density and orientation are of great value for the exploration of the subsurface.

As it always happens, to understand the interplay among the various controlling factors it is easier to consider the forward problem, that is to analyze the cause-effect relations between petrophysical parameters and the seismic response. This is the case because we are not challenged by ambiguities, or by sensitivity or ill-posedness issues that get in the way of the attempts to solve inverse problems.

Therefore, this short lecture illustrates a conceptual trail that drives the understanding of the petro-seismic relations that are the foundations of several modern seismic technologies and ongoing research projects. Fracture detection in hard rocks, monitoring of the changes in fluid content due to hydrocarbon production or CO2 injection, porosity and fluid saturation estimates, are the main objects of my talk and are illustrated making use of real data cases.

Afferenza: 
Dipartimento di Scienze della Terra, Università di Pisa
Proponente: 
Giorgio Cassiani

Il servizio stage e career service dell’Università di Padova

Data: 
Martedì, 15 Marzo, 2016 - 16:30 - 17:30
Aula: 
Aula Arduino
Relatore: 
Silvia Spiandore
Abstract: 

Durante l'incontro verranno illustrate le opportunità finalizzate all'orientamento e all'inserimento nel mondo del lavoro e tutte le attività che il nostro Servizio organizza per i propri studenti e laureati (laboratori di orientamento, colloqui, presentazioni aziendali, career days, ... ).

Lo scopo è quello di creare un momento di condivisione e confronto in cui accogliere eventuali suggerimenti da parte di docenti e studenti.

Afferenza: 
Servizio stage e career service, Università di Padova
Tipo seminario: 
Avvio al lavoro
Proponente: 
Commissione seminari

Partial melting of the continental crust: from lab to nature

Data: 
Martedì, 1 Marzo, 2016 - 16:30
Aula: 
Aula Arduino
Relatore: 
Anne-Céline Ganzhorn
Afferenza: 
Université Pierre et Marie Curie, Paris
Proponente: 
Bernardo Cesare

Crater size-frequency distribution measurements on the Moon

Data: 
Giovedì, 4 Febbraio, 2016 - 16:30
Aula: 
Aula 2M
Relatore: 
Harald Hiesinger
Abstract: 

Crater size-frequency distribution (CSFD) measurements are an often used  tool to derive absolute model ages of planetary surfaces. The presentation will describe the technique and will critically review their caveats. In  addition, the latest results from CSFD measurements on a variety of lunar surface features will be discussed.

Afferenza: 
Munster University
Proponente: 
Matteo Massironi

Traditional and new ways to investigate geology in coal-seam-gas and geo-sequestration research

Data: 
Venerdì, 18 Dicembre, 2015 - 10:30
Aula: 
Aula 2M
Relatore: 
Valeria Bianchi
Abstract: 

Joining the research in coal exploration at the University of Queensland, it has become increasingly important to integrate traditional and innovative methods for investigating hydrocarbon-bearing formations that are poorly exposed and mostly buried deep in the Australian craton.

 

Surat Basin (Eastern Australia) is a large Jurassic-early Cretaceous clastic basin, which hosts several coal measures interbedded with sand-dominated formations. Although the exploration of this basin is now at its acme (with more than 8000 wells), the central areas have not been explored yet and syn-depositional tectonics started to be taken into account. The School of Earth Sciences at University of Queensland is engaged with basin exploration, supporting government and coal companies with high-level research.

 

A basin-scale analysis, incorporating outcrop sedimentology (facies analysis, photogrammetry, hyperspectral imaging), well bore analysis (wireline and image logs, hyperspectral scanners) and prediction modelling (stochastic modelling, multi-point statistics, forward modelling), is presented. This is necessary to understand the facies and lithology distribution and connectivity between formations.

 

The deep investigation of these precious basins is important mainly for the sustainability of our communities, environment and industry economic standing. With strategic investigation we can avoid pollution between gas and aquifers. Furthermore, exploiting the basin configuration, we can detect the ideal formation for green house gas injection in geo-sequestration purposes.

 

Afferenza: 
Dipartimento di Geoscienze, Università di Padova
Proponente: 
Massimiliano Zattin, Massimiliano Ghinassi

Strumentazione geotecnica e monitoraggio dei fenomeni franosi

Data: 
Giovedì, 21 Gennaio, 2016 - 16:30
Aula: 
Aula Arduino
Relatore: 
Alessandro Pasuto
Afferenza: 
CNR-IRPI, Padova Dirigente di ricerca Responsabile Sezione Secondaria
Proponente: 
Mario Floris

La sorveglianza sismica e l'allerta tsunami: status e prospettive future

Data: 
Giovedì, 10 Dicembre, 2015 - 16:30
Aula: 
Aula Arduino
Relatore: 
Alberto Michelini
Afferenza: 
Dirigente di ricerca dell'INGV
Proponente: 
Giorgio Cassiani

Advances in Quaternary Geochronology: Insights from combined in situ cosmogenic 14C-10Be analysis

Data: 
Giovedì, 28 Gennaio, 2016 - 16:30
Aula: 
Aula Arduino
Relatore: 
Kristina Hippe
Abstract: 

Afferenza: 
ETH Zürich
Tipo seminario: 
Arduino Lecture
Proponente: 
Silvana Martin

U/Pb ages of the Central Atlantic magmatic province

Data: 
Giovedì, 3 Dicembre, 2015 - 16:30
Aula: 
Aula Arduino
Relatore: 
Joshua Davies
Abstract: 

Afferenza: 
Universite de Geneve, CH
Proponente: 
Andrea Marzoli

Fractal clustering of vents and depth of fluid reservoirs

Data: 
Giovedì, 19 Novembre, 2015 - 16:30
Aula: 
Aula Arduino
Relatore: 
Francesco Mazzarini
Abstract: 

Deformation (seismicity) and magmatism (volcanism) are spatially associated along plate boundaries. Transport of magma from lower crustal–upper mantle reservoir regions to its final level of emplacement mainly occurs through magma filled fracture networks (i.e. connected dykes and sills).

Such a tight spatial and genetic relationships between volcanoes and fractures suggest that the properties of spatial distribution of fractures (fracture networks) can be applied also to the spatial distribution of volcanic vents.

Here I present a methodology for analysing spatial distribution of monogenetic basaltic vents in volcanic fields by accounting for their self-similar clustering.

The assumption are: i) monogenitc vents are univocally linked to a dike (i.e. fluid filled fracture), ii) vents are points in the portion of the fracture network connecting the site of magma storage at depth (reservoir) with the surface, iii) vent clustering is approximate by power law distribution, iv) the undergoing process can be modelled by the Percolation Theory.

Being all natural systems finite, the self-similar clustering of vents occurs within a specified length range defined as size range and bounded by characteristic cut-off lengths. Comparing vent clustering with independent geophysical (gravity, seismic, and seismology) and geochemical (mineral chemistry) data sets for several volcanic fields a clear linear relationship between the depth of the main magma storage (reservoirs) and the upper cut off of the size range is observed.

This approach has been used also in mud volcanoes in Azerbaijan and is going to be applied for studying volcanism in Mars and Mercury.

Afferenza: 
INGV
Proponente: 
Matteo Massironi
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