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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Seismic
Processing Contribution to the Rejuvenation of Oman’s Oldest
Oil Field
1 PDO, Muscat, Oman, phone: 0096824674006,
[email protected]
2 CGG
Fahud is PDO's oldest and largest oil field. It measures 17 km by 2.5 km, with an STOIIP of more than 6 billion barrels of oil and produces from the Natih carbonates.
The topography of the Fahud field is a rugged limestone jebel (mountain) underlain by soft Fiqa shales. The anticline is dissected by wadis (dry river valleys), with surface elevations varying between 140 and 350 meters.
The 1994 seismic
data
was re-processed in 1997, without resolving all
data
quality issues. After thorough analysis of the
data
, and a 2D/3D pilot project, a new 3D
seismic
survey was acquired in 2004 combined with acquiring 20 up -holes, drilled
to a depth of 150 m AMSL.
Significantly improving the seismic
image quality for the field required solving the complex surface and near surface
problems. This was achieved through building a high fidelity velocity model, for the near surface and the deeper velocity
variations, used to tackle both the static and dynamic positioning errors through application of statics and pre -stack depth
migration. The model incorporated elevations, up-holes, well-tops, check-shots, near surface geology, remote sensing
data
,
interpretation
of near surface
seismic
reflections and
seismic
velocities.
The paper will demonstrate how this was crucial to extract value from Fahud and how this contributed to the rejuvenation of the FDP for Oman's oldest and largest oil field.