SEAM PHASE I GRAVITY
Neda Bundalo
DENSITY MODEL
- Cell size 40x40x20 m
- Density range 1.003 – 3.140 (2.64) g/cm3
SEAM PHASE I GRAVITY MODEL
SEAM Phase I model: density cube
SEAM PHASE I GRAVITY MODEL
CALCULATED GRAVITY
Gravity (vertical component) Gz
and six tensor components (gradients) Txx, Txy, Txz, Tyy, Tyz, Tzz,
- GMSYS 3D (Geosoft) and 3MOD (LCT Fugro),
- free-air and Bouguer anomalies on two calculation levels: 0 m for marine and 150 m for airborne data,
- recommended data storage formats: Geosoft grid and ascii xyzg. Vector (beige) and tensor (red)
components of gravity field;after Murphy, 2004.
SEAM PHASE I GRAVITY MODEL
CALCULATED GRAVITY
- with and without background density
- density of 2.2 g/cm3 used as a background density (mean voxel density)
- density of 2.0 g/cm3 used for Bouguer correction
SEAM Phase I model: vertical density slice
SEAM PHASE I GRAVITY MODEL
Free-air anomalies at sea levelbackground density 2.2 g/cm3
Txx
Tyy
TxzTxy
Tyz
Tzz
Gz
SEAM PHASE I GRAVITY MODEL
Txx
Tyy
TxzTxy
Tyz
Tzz
Gz
Free-air anomalies at 150 m levelbackground density 2.2 g/cm3
SEAM PHASE I GRAVITY MODEL
Txx
Tyy
TxzTxy
Tyz
Tzz
Gz
Bouguer anomalies at sea levelBouguer correction density 2.0 g/cm3
background density 2.2 g/cm3
SEAM PHASE I GRAVITY MODEL
Txx
Tyy
TxzTxy
Tyz
Tzz
Gz
Bouguer anomalies at 150 m levelBouguer correction density 2.0 g/cm3
background density 2.2 g/cm3
SEAM PHASE I GRAVITY MODEL
CONTRIBUTORS
Dr. Neda Bundalo (Marathon Oil), Dr. Richard Day (ConocoPhillips), John Bain (Bain Geophysical Services, Inc.)
THANKS TODr. Xiong Li, Barry Wiggins, Pat Quist (Fugro Gravity and Magnetics Services, Inc.), Dr. Stuart Hall (Department of Geosciences, University of Houston), Dr. Irina Filina (Hess)
NEXT STEP
COMPARISON OF BASE OF SALT INVERSIONSUSING VERTICAL COMPONENT AND GRAVITY GRADIENTS
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