Data Integration and Reservoir Characterization for Organic Rich Unconventional Plays - A Case Study from UAE
- Jeonggil Kang (Al Dhafra Petroleum Operation Company) | Francis Eriavbe (Al Dhafra Petroleum Operation Company) | Sajith Girinathan (Al Dhafra Petroleum Operation Company) | Alyazia Mohamed (Al Dhafra Petroleum Operation Company) | Neil Doucette (Al Dhafra Petroleum Operation Company) | Khalil Almehsin (Al Dhafra Petroleum Operation Company) | Jasim Ali Alloghani (Al Dhafra Petroleum Operation Company) | Abdulla Ali Al-Ali (Al Dhafra Petroleum Operation Company) | Faaeza Ahmed Al Katheeri (Al Dhafra Petroleum Operation Company) | Pranjal Bhatt (Baker Hughes, a GE Company) | Javier Franquet (Baker Hughes, a GE Company) | Gulzira Zhunussova (Baker Hughes, a GE Company) | Sila Uluyuz (Baker Hughes, a GE Company)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 11-14 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Reservoir Characterization, Unconventional, Organic Rich
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- 41 since 2007
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Several challenges are associated with the characterization of organic rich unconventional plays, most significantly with the identification of sweet spots for optimum placement of horizontal wells, estimation of producible hydrocarbons and subsequent stimulation design. This paper presents the petrophysics and geomechanics integration approach from the X Formation and the important factors for the identification of sweet spots.
The case study concentrates on the X Formation that consists of a succession of argillaceous limestone, mostly fine grained packstones and wackestones together with subordinate calcareous shales in the lower part. The complex carbonate lithology and fabric combined with low porosity and the requirement to evaluate total organic carbon presents a challenge to conventional logs and evaluation of them. Amid all the rock properties, the low permeability and productivity dictate the requirement to stimulate the wells effectively. Detailed integration of advanced and conventional log data, core data, mud logs and geomechanical analysis plays a critical role in the evaluation and development of these organic rich unconventional reservoirs. Extensive data gathering was done with wireline logging suite, which covered Resistivitiy/Density/Neutron/Spectral GR- Acoustic logs – Resistivity & Acoustic Images – Dielectric- NMR - Advanced Elemental Spectroscopy technologies and microfrac tests to characterize the hydrocarbon potential, sweet spots and in-situ stress contrast within the organic rich X Formation. The azimuthal and transverse acoustic anisotropies were obtained from X-dipole data to fully characterize the elastic properties of the formation. The static elastic properties were obtained using empirical core correlations as triaxial core tests were not available at the time of the study. The stress profile was calibrated against straddle packer microfrac tests to identify intervals with stress contrast for proper hydraulic fracturing interval selection.
The integration of conventional and advanced logs enabled the accurate evaluation of total organic carbon (TOC), petrophysical volumes, and sweet spot selection. The advanced elemental spectroscopy data provided the mineralogy, amount of carbon presence in the rock, and consequently the associated organic carbon within the X Formation. The NMR reservoir characterization provided lithology independent total porosity. The difference between the NMR and density porosities provides additional information about organic matter. NMR data was utilized in this case study to identify and differentiate the organic matter and hydrocarbon presence within the X Formation.
Acoustic and image logs provided the geomechanical properties that enable selection of the best intervals for microfrac stress measurement and proper fracture containment modeling. Geomechanical workflow allowed identification of intervals with a good stress contrast in X formation. The core data and stress measurements are recommended for the accurate calibration of the stress profiles and hydraulic fracture propagation modeling.
The extensive data integration work presented in this single-well study within X Fomation, is a key factor for any organic rich unconventional reservoir characterization that integrated geology, petrophysics, mineralogy, and geomechanics for sweet spot identification within tight oil carbonate reservoirs.
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Acharya, M. N., S. A. H. Al-Ajmi, M. A. Al-Awadi, and A. J. Al-Eidan. 2009. Characterization of Kerogen Reservoirs by Organic Richness from Well Logs: A New Approach for Gas and Condensate Reservoirs in Najmah Formation, North Kuwait. Presented at the SPE/EAGE Reservoir Characterization and Simulation Conference, Abu Dhabi, UAE, 19-21 October. SPE-125276-MS https://doi.org/10.2118/125276-MS
Addis, A., H-C. Freitag, A. Mendez, and R. Ceccarelli. 2015. The Role of Pilot Projects in the Development of Unconventional Resources. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 9-12 November. SPE-177783-MS https://doi.org/10.2118/177783-MS
Alam, A., G. M. Hegazy, A. Naveed, 2014. Fracturing in Unconventional Reservoirs can be Challenging: UAE Case Study, Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 10-13 November. SPE-171751-MS https://doi.org/10.2118/171751-MS
Al-Sulami, G., M. Boudjatit, M. Al-Duhailan, and S. Di Simone. 2017. The Unconventional Shale Reservoirs of Jafurah Basin: An Integrated Petrophysical Evaluation using Cores and Advanced Well Logs. Presented at the SPE Middle East Oil & Gas Show and Conference, 6-9 March. SPE-183771-MS https://doi.org/10.2118/183771-MS
Al-Zaabi, M., A. Taher, I. Azzam and J. White. 2010. Geological Overview of the Middle Cretaceous Mishrif Formation in Abu Dhabi. Presented at the International Petroleum Conference, Doha, Qatar, 6-9 December. SPE-137894-MS https://doi.org/10.2523/IPTC-18488-MS
Bhatt, B., G. Zhunussova, S. Uluyuz, G. Makarychev, 2018. Integrated Reservoir Characterization for Successful Hydraulic Fracturing in Organic Rich Unconventional Plays – A Case Study from UAE. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 12-15 November. SPE-192845-MS https://doi.org/10.2118/192845-MS
Dasgupta, S., I. Raina, M. Povstyanova, 2017. Shedding the First Ligth on the Shilaif Source Rock in the Syncline, Onshore Abu Dhabi, UAE. Presented at the Abu Dhabi International Petroleum Exhibition & Conference, Abu Dhabi, UAE, 13-16 November. SPE-188762-MS https://doi.org/10.2118/188762-MS
Makarychev, G., K. Leyrer, M.Z. Baig, and P. Van Laer. 2018. Integration of Geochemical and Petrophysical Analysis for Shilaif Formation Characterization. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 12-15 November. SPE-193331-MS https://doi.org/10.2118/193331-MS
Pemper, X., F. Mendez, D. Jacobi, 2009. The Direct Measurement of Carbon in Wells Containing Oil and Natural Gas Using a Pulsed Neutron Mineralogy Tool. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, 4-7 October. SPE-124234-MS https://doi.org/10.2118/124234-MS
Povstyanova, M., M. Coscia, P. Van Laer, 2018. Stress Testing with Improved Wireline Formation Tester in Low Permeability Unconventional Formation. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 12-15 November. SPE-193272-MS https://doi.org/10.2118/193272-MS
Steiner, S., S. A. Ahsan, I. Raina, 2016. Interpreting Total Organic Carbon TOC in Source Rock Oil Plays. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 7-10 November. SPE-183050-MS https://doi.org/10.2118/183050-MS
Taher, A. 2010. Unconventional Oil Exploration in Early Mature Source Rock Kitchens. Presented at the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 1-4 November. SPE-137897-MS https://doi.org/10.2118/137897-MS
Vahrenkamp, V., B.J. Franco, D. Popa, 2015. Development and Infill of the Late Albian to Turonian Shilaif Intrashelf Basin at the Eastern Margin of the Giant Mesozoic Arabian Carbonate Platform: Basin Architecture and Time Stratigraphy. Presented at the International Petroleum Conference, Doha, Qatar, 6-9 December. IPTC-18488-MS https://doi.org/10.2523/IPTC-18488-MS