oa Gas Log Monitoring - Challenges and Uncertainties in Gas Injection Pilot in Carbonate Reservoir - A Case Study in UAE

The field under study is Lower Cretaceous anticline carbonate reservoir in onshore Abu Dhabi, UAE. It<br>is characterized by well developed porosity but low to moderate permeability, occasionally, with high<br>permeability streaks. The field structure is highly faulted; consequently, many reservoir layers are<br>juxtaposed due to faulting which have a significant role in the reservoir’s performance. Pressure<br>maintenance is supported by peripheral water injection. Two gas injection pilot projects are underway<br>to investigate the benefits of gas injection above MMP (Minimum Miscibility Pressure) in the low<br>permeability reservoirs.<br>As part of the field development a peripheral water injection scheme is in place, and two gas injection<br>pilots were commissioned for injection in the entire reservoir.<br>The purpose of this work is to:<br>- present an overview on the implemented strategy for log monitoring in sense of the logging types,<br>logging timing and the interpretation techniques;<br>- summarize specific actions taken to gather log data;<br>- discuss and evaluate the field observations; and<br>- address the challenges and uncertainties of monitoring process.<br>The results of the monitoring observations in this work are being incorporated into simulation studies<br>for a conclusive assessment of the pilots.