SEAM PHASE I GRAVITY

1. SEAM PHASE I GRAVITY Neda Bundalo

2. SEAM PHASE I GRAVITY MODEL DENSITY MODEL- Cell size 40x40x20 m- Density range 1.003 – 3.140 (2.64) g/cm3 SEAM Phase I model: density cube

3. SEAM PHASE I GRAVITY MODEL CALCULATED GRAVITY Gravity (vertical component) Gzand 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.

4. 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

5. SEAM PHASE I GRAVITY MODEL Free-air anomalies at sea level background density 2.2 g/cm3 Txy Txz Txx Tyz Tyy Gz Tzz

6. SEAM PHASE I GRAVITY MODEL Free-air anomalies at 150 m level background density 2.2 g/cm3 Txy Txz Txx Tyz Tyy Gz Tzz

7. SEAM PHASE I GRAVITY MODEL Bouguer anomalies at sea level Bouguer correction density 2.0 g/cm3 background density 2.2 g/cm3 Txy Txz Txx Tyz Tyy Gz Tzz

8. SEAM PHASE I GRAVITY MODEL Bouguer anomalies at 150 m level Bouguer correction density 2.0 g/cm3 background density 2.2 g/cm3 Txy Txz Txx Tyz Tyy Gz Tzz

9. SEAM PHASE I GRAVITY MODEL NEXT STEP COMPARISON OF BASE OF SALT INVERSIONS USING VERTICAL COMPONENT AND GRAVITY GRADIENTS CONTRIBUTORSDr. 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)