Discovery Method
Sarir was discovered by geophysical methods and subsurface geology with no topographic or geomorphic anomalies being reported. An air magnetometer revealed the southwestern A structure and its southeastern prolongation, which was later found to be a buried fault line. Sarir is located on the northwest plunge of a gravity maximum axis and overshadowed by two western features: (1) a large gravity maximum, the A structure; (2) a strong gravity maximum, the B structure. The eastern feature, rising to a gravity maximum, is known as the C structure (Sarir C).
Seismic reflection and refraction surveys (1960-1961) revealed that the C structure has a pronounced basement feature. An Eocene seismic reflection horizon was mapped, showing a few hundred feet of relief over the entire complex, compared to a refraction map showing up to 610 m. After drilling the first two wells in C-65 (A and B structures), an Eocene map showed the C structure as having 300 ft (91 m) of closure. This was considered sufficient justification to proceed with drilling.
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