we study the state and evolution of pressure, stress ...€¦ · geofluids co-directors 2018...
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ExperimentalField StudiesGeomechanical Modeling
OnlineGeoFluidsdatabase
Deliverables:- Online presentations- Online database of experimental program- Publications- Online software- Spreadsheets, handbooks
GeoFluids Co-Directors
2018 Consortium Meeting55 attendees representing11 different companies.
We study the state and evolution of pressure, stress, deformation, and fluid migration through experiments, models, and field study. We are dedicated to producing innovative
concepts that couple geology and fluid flow.1. Experimental: Analyze fabric, acoustic, electrical, and material properties of mudrocks : 0.1-100 MPa.2. Modeling: Develop and apply coupled models to link realistic rheologies, deformation, stress (shear & normal), and pore pressure3. Field Study: Analyze pore pressure, stress, deformation in thrust belts and in the sub-salt.
Website: http://www-udc.ig.utexas.edu/geofluids/Contacts: [email protected], [email protected], [email protected], [email protected]
Annual Consortium Meeting
Incorporation of sequential restoration into evolutionary modelling
Transferring technology at the annual meeting and workshop
UT GeoFluids: A team effort of UT Geoscientists and Tufts Geotechnical Engineers
Peter FlemingsProfessor
Jackson School of Geosciences
The University of Texas at Austin
Jack GermaineResearch ProfessorDepartment of Civil and Environmental EngineeringTufts University
2 Research Scientists1 Postdoc7 Graduate Students2 Collaborating Faculty4 Staff/Technical Support
Lithology-dependent fracture gradient
10 11 12 13 14 15 16
18,000
17,000
16,000
15,000
14,000
13,000
12,000
True Vertical Depth Below Mudline (ft) 18,000
17,000
16,000
15,000
14,000
13,000
12,000
True Vertical Depth Below Mudline (ft)True
Ver
tical
Dep
th B
elow
Mud
line
(ft)
Measuredpore pressure
Equivalent Mud Weight Below Mudline (ppg)
Overburden
Sandσ3
Lithology-dependent σ3
Shaleσ3
Lithology at Macondo (%)0 10050
CLAY
SILT
Intact vs. resedimented behavior
Vertical effective stress, σ’v (MPa)
Por
osity
FES pressure prediction at Nankai
Anisotropic wavefield
Geomechanics and seismic imaging
Stress ratio, K0.5 1.5
130 Ma (Top Cretaceous)
1.0
Seismic velocityand geometry + 3D geomechanical
modeling = Pore pressure &Full stress tensor
Velocity (ft/s) Shear stress (MPa) Overpressure (MPa)
6000 10000 14000 0 10 20 0 20 40
3D FES pressure prediction at GC 955Contribution of mean and shear to pressure generation in thrust belts
Stif
fnes
s (G
Pa)
20
10
40
30
Axial effective stress (MPa)30 60 90 120
1010
8
6
4
2
Dep
th (k
m)
TrenchTrench
12
0 0402
ue [MPa]TransitionCritical State Initial
1003 52 02
a
c
40 30 20 10 0 -10 -20Distance from trench (km)
Pre
ssur
e (M
Pa)
0
40
80
120
b
abc
2 km
5.2 5.35.1
[km/s]11748084
5
6
7
Dep
th (k
m)
4
5
6
7
Dep
th (k
m)
Distance (km)0 5 10 15 20 25 30
1174808
5 212-
ue (MPa)
Resedimented
Intact