Producing hydrocarbon directly from the early mature source rock is becoming a subject of interest for Abu Dhabi National Oil Company (ADNOC) in recent years. The maturation modeling done in ADNOC for the Cenomanian Shilaif formation indicated the presence of early mature kitchens in the offshore and southern onshore synclines.Another maturation modeling showed that the Oxfordian Diyab Formation is also prospective mainly in the northwestern offshore area of Abu Dhabi.Several conventional stimulation attempts were made in order to produce hydrocarbon from these source rock intervals encouraged by strong hydrocarbon shows while drilling and high hydrocarbon saturation from interpreted logs. Unfortunately, no successful results were obtained during all previous trials.A volumetric calculation showed that the estimated volume of the hydrocarbon available in these new areas is significant and once a successful production method is implemented, an economical hydrocarbon recovery can be obtained.In 2011, ADNOC drilled one well in the onshore area of Abu Dhabi. A secondary objective of the well was to test productivity of Diyab source rock and for the first time in Abu Dhabi a new approach was planned and implemented to produce these source rock intervals.Due to logistical issues, the original testing design was not excuted, and a re-designed program was performed with the available equipments on site to prove the concept of producing hydrocarbon from such formations.Promising results of gas and condensate were obtained and assuming much better results if the well is drilled in the optimum potential location in the most northwestern onshore area of Abu Dhabi.In this paper, we will explain both the geological aspects of the potential Diyab source rocks in Abu Dhabi and the planned program, difficulties, executions and results of the new approached stimulation.

This reference is for an abstract only. A full paper was not submitted for this conference. Abstract ADMA-OPCO and ZADCO are performing an intensive 3D OBC (Ocean Bottom Cable)seismic survey offshore Abu Dhabi with the twin primary objectives of defining the Thamama reservoir in an undeveloped structure and defining the overlapping Mishrif reservoir in a currently producing field. Survey value is increased by the reservoir characterization information that can be extracted from the seismic data. The structural Thamama target has different seismic acquisition geometry requirements to those of the stratigraphic Mishrif reservoir. OBC acquisition has a huge range of potential geometries and value and costs. This paper describes the processes that were used to reconcile the technical and economic conflicts. Experience from a previous 3D OBC survey highlighted the generic problems in the area:Source-generated noiseStrong multiple interferenceAcquisition footprint New survey design had to overcome these plus deliver high-resolution data(80 Hz at target level) to attain the stratigraphic and reservoir characterization objectives within a finite budget. Team identification of key objectives was critical for the implementation of the successful survey design. Analysis and review of various modeling processes(acquisition geometry, seismic processing responses, acquisition economics)guided the team to an affordable solution that meets the geophysical objectives of a high-quality, high-resolution survey. The process has provided a methodology that will be used as a basis for evaluating of cost versus quality in future surveys.

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