Re: SEMINAR: MGG Student Seminar - Tues Mar 2

[aditya@rsmas.miami.edu]

> MGG Student Seminar
> Tuesday March 2, 2010
> Cimas Conference Room
>
> Albertus Ditya

" OLIGO-MIOCENE FRACTURED REEF DEPOSIT,
WEST JAVA, INDONESIA


Fractured reservoirs have the potential to be large producers of
hydrocarbons. There is a possibility of an occurrence of fractured
carbonate reservoirs, however, carbonate reef is still being a challenging
topic, due to it?s heterogeneity. In a tectonically active area, such as
Indonesia, fractures study plays an important role. The structural
deformation result of the heterogenic fabric of carbonate reef might
deform the rocks, which then will be interested to be studied. Then, could
we recognized the fractures pattern from outcrop study?

Outcrop study of the Oligo-Miocene carbonate reef deposit in West Java
Indonesia has been carried out to characterize fracture types and their
formation. Field observations were made using the one dimensional
scan-line method and the data was analyzed utilizing standard statistical
methods. The lithology is a boundstone facies which consist of framestone,
bafflestone, and bindstone. The study area is located at the crest of fold
thrust belt and near a strike slip fault with associated with thrusting.
The results of the study show that fracture orientation still been
controlled by paleostress. The most common fracture type that developed in
the carbonate reef is stylolite.  Secondary processes such as dissolution
along stylolite surfaces due to the groundwater interaction have also
played a major role in enlarging fracture apertures. "
>
> and
>
> Marco Bagnardi
> Fernandina volcano, Galapagos: where is the magma chamber?
>
> Study of active magmatic processes using Satellite Radar
> Interferometry .
>
> At ocean island volcanoes only a fraction of the magma coming from the
> mantle is erupted; the remaining magma is stored in crustal magma
> chambers, or trapped near the crust-mantle boundary. Magma intrusions
> increase the pressure and inflate the volcanic edifice, triggering
> earthquakes and eruptions. The geometry of the magma chamber and
> conduits, therefore, is fundamental to the development of predictive
> models of volcano deformation and eruptions for any kind of volcanic
> hazard mitigation program.
>
> The Galapagos Archipelago, located on the Nazca plate about 1000 km
> West of Ecuador, is formed by some of the most rapidly deforming ocean
> island volcanoes. Fernandina volcano, on the homonym island, is one of
> them.
>
> Fernandina Island consists of a single volcano with a maximum
> elevation of 1470 meters and a central caldera nearly 1000 meters
> deep. Fernandina, considered one of the most active volcanoes in the
> world, has erupted 15 times since 1958.
>
> We examine the deformation associated with the latest events using
> Interferometric Synthetic Aperture Radar (InSAR) satellite data from
> the European satellites ERS-1, ERS-2 and Envisat acquired over
> Fernandina from 1992 to 2009. SAR interferograms are then used to
> study spatial and temporal evolution of the deformation and to
> generate source models.
>
> Our preliminary results show different sources of deformation involved
> during pre-eruptive, co-eruptive or post-eruptive phases, that are
> probably associated with different processes of magma accumulation and
> withdrawal.
>
>
>
>
>





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