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Collaborating Authors
Results
Value of Well Test in the Determination and Characterization of Natural Fractured Reservoir Properties in Large Onshore Abu Dhabi Carbonate Field
Abdul Rehman, Abdul Samad (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Kumar, Arun (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Bejaoui, Riadh (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Nazarbayev, Nurbek (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Shuaib, Mohamed (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Sirat, Manhal (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Singh, Maniesh (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Al-Dayyani, Taha (Abu Dhabi Company for Onshore Oil Operation (ADCO)) | Ancuta, Cristian (SENERGY) | Farcasanu, Angelo (SENERGY) | Gholipour, Ali (SENERGY) | Belayneh, Mandefro (SENERGY)
Abstract Identifying natural fractures and assessing their impact on flow behavior in hydrocarbon reservoirs have been one of the key challenges in defining the field development strategy. Failure to correctly represent the natural fractures when working on a reservoir development plan can lead to poor performance and failure to analyze reservoir response. Pressure transient testing is widely recognized as a core competency in the oil industry as it provides subsurface specialists with valuable information regarding the reservoir properties, well connectivity to the reservoir and extent of reach into the reservoir. When borehole image (BHI) data triggers a signal that fractures are seen in wells but flow rates do not show production dominated by fractures, the engineers working on the reservoir need to pay attention to pressure transient tests. Depending on the contrast between fracture permeability and matrix permeability, pressure transient analysis in a fractured reservoir can show clear dual porosity behavior, or the effect can be masked by the wellbore storage. The latter happens when the contrast between the matrix permeability and the fracture permeability is small. The two parameters which characterize a dual porosity model are the storativity ratio, ฯ, and the inter-porosity flow coefficient, ฮป. The average value of ฮป for the vertical wells studied is 25*10, confirming a low contrast between fissure and matrix permeability. For the storativity ratio, a typical value is between 0.001% and 0.1%. An average of 0.03% has been calculated from the well tests. With the results from pressure transient tests, BHI and core description, fractures have been defined as mild with relative low-intensity. Numerical modeling on a field sector was employed to test the impact of the fractures on production.
- Geophysics > Seismic Surveying (0.49)
- Geophysics > Borehole Geophysics (0.48)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Pressure transient analysis (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Drillstem/well testing (1.00)
Conceptual Structural Model of an Onshore Carbonate Hydrocarbon Field in Abu Dhabi: Constraints and Implications
Sirat, Manhal (Abu Dhabi Company for Onshore Oil Operation (ADCO), UAE) | Mahmoud, Sabry L. (Abu Dhabi Company for Onshore Oil Operation (ADCO), UAE) | Popa, Desdemona Magdalena (Abu Dhabi Company for Onshore Oil Operation (ADCO), UAE) | Koyi, Hemin (Uppsala University, Sweden)
Abstract A carbonate field in Onshore Abu Dhabi is characterized by its complicated structural setting, which involves basement tectonics. A new seismic attributes analysis has been conducted to reveal the structural style, and to identify significant lineaments representing possible major and minor faults. Based on this analysis, a conceptual model is presented, which reveals the development mechanism of the major structure and associated faults. Structural constraints such as lineaments length, faults throw and displacements are strongly related to the seismic resolution constraint. Whereas timing of the structural development events represents a challenge and needs to be linked to sedimentation and sequence stratigraphic framework and thus needs further study. In total, six fracture sets have been identified including the N75W, N45W, NS, EW, NE-SW and N70E. The Conceptual structural model shows that the contractional structure has been modified as a giant positive flower structure-like associated with a basement strike slip fault. At least two major longitudinal faults bound the structure parallel to its fold axis (NE-SW), which pose sigmoidal map geometry. There are numerous transverse faults linking and/or cross cutting those longitudinal faults creating andulations that may define new minor plays. Significant implications of this study include better understanding of the regional structural geology of Abu Dhabi, and define new plays within the studied structure. In addition, the new identified fracture system provides essential information for the ongoing and future development plans for this field and for other fields in the region with similar structural settings.
- Phanerozoic > Cenozoic (0.93)
- Phanerozoic > Mesozoic > Cretaceous > Upper Cretaceous (0.71)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous (0.68)
- Phanerozoic > Paleozoic > Permian (0.68)
- Geology > Structural Geology > Tectonics > Plate Tectonics (1.00)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (1.00)
- Geology > Structural Geology > Fault (1.00)
- Geology > Geological Subdiscipline (1.00)
- Geophysics > Seismic Surveying > Seismic Interpretation (0.89)
- Geophysics > Seismic Surveying > Seismic Processing (0.70)
- Asia > Middle East > Iraq > Zagros Basin (0.99)
- Asia > Middle East > Iran > Zagros Basin (0.99)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Abu Dhabi Field (0.97)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Faults and fracture characterization (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)