SEMINAR: Student Seminar 12 PM Feb 9

["Noelle J Van Ee" <nvanee@rsmas.miami.edu>]

**********************  MGG Student Seminar Presents **********************

                  "Monitoring Mexico City Subsidence with Space Geodesy"
                                                 Batu Osmanoglu

                                                            &
                                    "The Picun Leufu Formation:
         An Outcrop Analog for Subsurface Oil Reservoirs? Neuquén Basin,
Argentina"
                                                  Michael Zeller

Where: CIMAS Conference Room
When: Tues. Feb. 9, 12-1 PM

Abstracts below.

Title: Monitoring Mexico City Subsidence with Space Geodesy

Batu Osmanoglu

Abstract:
We analyzed twenty three satellite SAR (Synthetic Aperture Radar) scenes
using persistent scatter
interferometry (PSI) to study subsidence in Mexico City associated with
groundwater withdrawal.
The data were acquired by the Envisat ASAR system between January 2004 and
July 2006. The
spatial pattern of subsidence and the maximum subsidence rate (300 mm/yr)
are similar to earlier
studies. Comparison to independent GPS data indicates rms agreement
between the two tech-
niques of 6.9 mm/yr, about the level expected based on joint data
uncertainty. Significant annual
variation in the GPS vertical data is not observed, suggesting minimal
aquifer recharge during
the rainy season, and justifying a simple linear model of phase variation
through time for the PSI
analysis. Analysis of local subsidence rates with PSI indicates
considerable variation depending on
construction style and foundation type, but not closely related to local
aquifer or aquitard depth.

Title: The Picun Leufu Formation:
An Outcrop Analog for Subsurface Oil Reservoirs?
Neuquén Basin, Argentina

Michael Zeller

Mixed carbonate siliciclastic reservoirs are highly complex systems with
heterogeneous properties because of the intertwining of different facies
and the often complicated diagenesis. Adequate reservoir characterization
can only be achieved by integration of geometric, lithologic and
petrophysical data. The level of detail necessary to capture the
small-scale variations of reservoir quality lies commonly below seismic
resolution and therefore requires the incorporation of detailed outcrop
observations with larger scale seismic interpretations.
The Picun Leufu Formation of the Neuquén Basin is assumed to serve as an
outcrop analog for subsurface reservoirs of the approximately time
equivalent Quintuco Formation. However, before the integration of
quantitative and qualitative outcrop data into the reservoir model, the
value of the formation as an outcrop analog has to be evaluated. The
comparison of the main elements 1) paleogeography, 2) lithostratigraphy,
3) stratal architecture and 4) timing is crucial in order to decide about
the applicability of the outcrop data.
Outcrop and subsurface strata were deposited during the same time interval
within the same basin and therefore fulfill the parameter of similar
paleogeographic setting. Furthermore, the facies character of the mixed
carbonate siliciclastic deposits is very comparable. Both subsurface and
outcrop strata can be subdivided into three packages: a lower prograding
mixed unit, a middle aggrading mixed to pure carbonate unit and an upper
mixed unit, which are bound by equivalent package boundaries. The question
of timing still remains open, but will be investigated by using Sr dating
techniques of outcrop and subsurface shell material, as well as
correlation of main horizons in a basin wide 3D seismic volume.
Overall due to the striking similarities the outcrop information will add
valuable information, which should be integrated into the subsurface
models.


Noelle J Van Ee
Marine Geology and Geophysics
nvanee@rsmas.miami.edu
Office NG 207
work: (305) 421-4810 x6
cell: (920) 279-9580



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