Abstract
The present day structure of Al Jabal Field is a NE-SW trending anticline structure. The prominent shape of this structure is the product of a Pre-Cretaceous topographic high, which was modified by faulting, erosion and transgressive sedimentation during the Cretaceous and by faulting during the Palaeocene and Eocene. A major fault, bounding this structure on the west, defines Al Hagfah Trough/Zaltan Platform. Two other minor faults splay off from this major fault, cut the main structure and probably seal Al Jabal
structural anticline from the west to the northwest.
The Upper Cretaceous Waha Limestone is a primary reservoir target on the Zaltan Platform. The reservoir ranges from zero thickness on the crests of topographic highs to over 350 feet on their flanks. Certain seismic reflection characteristics are noted in relation to the
prediction and location of the Waha reservoir where a thick Waha section is usually present. Strong acoustic impedance contrasts at the top of the Kalash (above the Waha) and the Bahi/ Gargaf (immediately below the Waha) generate reflections that define the envelope in which the Waha exists.
Most of the traps were discovered in Al Jabal Field on the basis of geological fieldwork and seismic surveys since the field was established have now reached their secondary recovery stage. This study led the search for smaller satellite structures to be associated with this giant field, particularly in its southern part of the field. Although these small features are considered to be of relatively low risk, especially with using the seismic techniques, the locality of new prospective structure anomalies has been defined, and could be a drilling target, which would enable the company to spot the oil leg target and develop production in this field.