AGENDA – ROSE meeting 23-24^th April 2012

Location: P1 in PTS1, S.P. Andersens veg 15, Trondheim.

Monday 23^rd April

09:30 Coffee and registration

09:50 Welcome

Session 1: Rock physics

10:00 Rock physics analysis and time-lapse rock imaging of the induced chemo-mechanical processes upon CO2 injection into reservoir rocks, Tiziana Vanorio, Stanford University

10:20 CO₂ deposition: Effect of carbonate dissolution on reservoir rock integrity, Kristian Eide, NTNU

10:40 Static and dynamic moduli, dispersion and brittleness of shales and shale wannabes, Rune M Holt, NTNU/ SINTEF

11:00 Comparison between static and dynamic behavior measured in Triaxial and Oedometric test systems, NTNU, Mohammad Hossein Bhuiyan, NTNU

11:20 Source rocks from seismic – principles and applications, Kenneth Duffaut, Statoil

11:40 Temperature dependence of acoustic waves in shales, Andreas Bauer, SINTEF

12:00 LUNCH

12:50 Water in clay and shale: Molecular scale and rock physics modelling versus experiments, Morten Kolstø, NTNU (& HiST)

Session 2: Modeling

13:20 Curved edge diffraction modeling, Tijmen Moser, MGS

13:40 Efficient 3D elastic FD modeling, Jon Marius Venstad, NTNU

14:00 Comparison of numerical seismic modeling results with acoustic water-tank data, Anastasiya Tantsereva, NTNU

14:20 Nonlinear elastic wave propagation in a dry weak sandstone, Anna Stroisz, NTNU

14:40 The normal modes periodic equation for anisotropic seabed conditions, Lyubov Skopintseva, NTNU

15:00 Coffee break

Session 3: Anisotropy and signal enhancement

15:20 Bandwidth enhancement: Time-varying Wiener deconvolution or inverse-Q filtering?, Mirko van der Baan, University of Alberta, Canada

15:40 Ground roll suppression using optimal weighted stacking, Olena Tiapkina, NTNU

16:00 Minimum-delay seismic trace decomposition with application to ground-roll attenuation, Bjørn Ursin, NTNU

16:20 Wave propagation in dip constrained TI media, Pavel Golikov, NTNU

16:40 Low-frequency layer-induced anisotropy, Alexey Stovas, NTNU

19:00 Dinner, Palmehaven, hotel Britannia, Dronningens gt. 5

Tuesday 24^th April

Session 3: Time lapse and reservoir characterization

08:40 Rock physics modeling and analysis of 4D time shifts – Visund Sør, Per Avseth, Odin Petroleum/NTNU

09:00 Time-lapse seismic comparisons using pre-stack imaging and complex wave field comparisons to improve accuracy and detail, Paul Stoffa, University of Austin

09:20 Estimating pressure and saturation changes from 4D traveltime shifts and a simple pseudo steady state flow equation, Martin Landrø, NTNU.

09:40 Pressure-saturation discrimination for the underground blow out data, Tuhin Bhakta, NTNU

10:00 Coffee break

10:30 Pressure-saturation discrimination applied to the Snøhvit CO2 data set, Sissel Grude, NTNU

10:50 Interpolating subsequent 3D seismic data sets at the Sleipner CO2 storage site, Anders Kiær, NTNU

11:20 Time lapse refraction analysis and full wave form inversion, Hadi Balhareth, NTNU

11:40 Simple expression for the bubble-time period of two clustered air guns, Daniel Barker, NTNU

12:00 LUNCH

Session 4: Imaging and inversion

13:00 Full waveform inversion in the image and data spaces, Børge Arntsen, NTNU

13:20 Modeling and migration of dual-sensor marine seismic data, Reynam Pestana, UFBA

13:40 Spatial gradient marine seismic sources and their applications, Johan Robertsson, ETH-Zurich

14:00 Coffee break

14:30 Kinematic time migration and demigration of reflections in prestack seismic data, Einar Iversen, Norsar

14:50 Reverse-time migration velocity analysis – A real field data example, Wiktor Waldemar Weibull, NTNU

15:10 3D inversion of EM data, Lutz Mutschard, NTNU

15:30 Resolution of 3D elastic full waveform inversion, Espen Nilsen , NTNU

16:00 Discussion and adjourn

25^th -26^th april: Course on geomechanics, P1, 8:30 Erling Fjær and Rune Holt. (course description on next page). Course ends at 17:00 26^th April

GEOMECHANICS FOR GEOPHYSICISTS

a 2day course

by

Rune Martin Holt & Erling Fjær, 25-26^th April 2012,

auditorium P1 at 08:30, PTS building, NTNU

Geomechanics has attracted growing awareness in the petroleum industry, also within seismics and rock physics, in later years. It is now widely accepted that dominant features observed in time lapse seismic originate from geomechanical processes, hence interpretation of such data require basic geomechanical knowledge. On the other hand, there are also significant efforts to utilize seismic data for estimation of geomechanical information such as rock stiffness, stresses and pore pressure. This requires essential knowledge about both rock physics and geomechanics, as well as the links between these disciplines.  

This course will cover the following subjects:

Elementary rock physics. Knowledge on how seismic velocities depend on stress, and how they relate to static mechanical properties, is essential for all studies on this subject. Observations and models will be presented, and elementary physical explanations will be offered.

Rock stresses and pore pressure. The origin of Earth stresses and pore pressure will be explained, and methods for determination of in situ stresses and pore pressure will be reviewed with particular focus on seismic methods. 

Reservoir geomechanics. The development of stresses inside and outside a depleting reservoir will be explained, and consequences in terms of reservoir compaction, surface subsidence and time lapse seismic will be discussed with reference to field examples.

Borehole mechanics. The stress concentrations in the vicinity of a borehole will be explained, and some consequences for interpretation of well logs will be discussed. Conditions for stability during drilling and production will be presented. Essential data for prediction of stability problems, and methods for estimation of such parameters will be reviewed.

Fracturing & fracture propagation. Fracturing is an important method for productivity enhancement, especially in tight formations. The method will be described, and challenges related to planning and monitoring of fracture propagation will be discussed.

Beyond elementary rock physics. The combination of rock physics and geomechanics is complicated by several effects, such as dispersion, anisotropy and non-trivial relations between static and dynamic properties. These effects are particularly important for the link between field observations and laboratory tests. Challenges related to these effects, and possible solutions, will be discussed.

The students will be given copies of the presentations as handouts at the beginning of the course. The textbook "Petroleum Related Rock Mechanics. 2^nd Edition" (Fjær et al., 2008) is recommended as a reference as well as for further reading.