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Collaborating Authors
Regional Assessment of the Upper Jurassic Hanifa and Tuwaiq Mountain Formations, Abu Dhabi: Implications for Prospectivity
Aitken, John F. (ADNOC) | Chitrao, Amogh (ADNOC) | Xie, Anni (ADNOC) | Fadipe, Oluwaseun (ADNOC) | Al Shamsi, Jawaher (ADNOC) | Vantala, Aurifullah (ADNOC) | Al Tameemi, Kate (ADNOC)
Abstract The Hanifa and Tuwaiq Mountain formations (Upper Jurassic Sila Group) are underexplored units in Abu Dhabi. Although there are several discoveries from the Hanifa Formation, both onshore and offshore, and encouraging indications in the Tuwaiq Mountain Formation, the conventional potential of these formations has not been fully realised. Uncertainties exist between onshore-offshore and west-east correlations, with conflicting stratigraphic terminologies, and the distribution of the Hanifa and Tuwaiq Mountain formations across Abu Dhabi, particularly details of facies distributions and transitions and their impact on the distribution of depositional environments through time. To reduce uncertainties and unlock resources a fully integrated study of the lower Sila Group across Abu Dhabi Emirate has been undertaken. Approximately 150 wells were correlated and integrated with the interpretation of six regional seismic transects (3 W-E and 3 N-S). More detailed interpretation over areas with 3-D seismic coverage helped to improve stratigraphic understanding. Cored wells were used to refine sedimentological interpretationsand extrapolated into uncored wells. Resolution of stratigraphic uncertainties mean that, for the first time, there are consistent lithostratigraphic and sequence stratigraphic schemes across Abu Dhabi Emirate that provide a reliable framework for basin modelling and play mapping. Furthermore, integration of all the sub-studies has led to the development of new depositional models and more detailed GDE maps. These are important inputs to basin modelling and the development of revised play maps that clearly highlight the prospective areas in Abu Dhabi. Focus on these prospective areas has led to the recognition of a significant number of structural leads and three new stratigraphic play concepts. These concepts include: a truncation trap geometry to the east, a possible collapse/mass movement trap on the slope, and a possible combined stratigraphic/structural trap where four-way dip closures overlap both the shoal and the slope, with the facies change to muddier slope deposits providing potential down-dip seal.
- Asia > Middle East > UAE > Abu Dhabi Emirate > Abu Dhabi (1.00)
- Asia > Middle East > Saudi Arabia (1.00)
- Geology > Sedimentary Geology (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.72)
- (2 more...)
- North America > Mexico > Veracruz > Tampico-Misantla Basin > Poza Rica Field (0.99)
- Asia > Middle East > UAE > Arab Formation (0.99)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Ghasha Concession > Umm Shaif and Nasr Block > Umm Shaif and Nasr Field > Umm Shaif Field > Arab Formation (0.99)
- (15 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Sedimentology (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
Integrated Reservoir, Geology and Geomechanical Characterization for Unconventional Development: Application to the Diyab Play
Pourpak, Hamid (TotalEnergies) | Hernandez, Eider (TotalEnergies) | Higelin, Maxime (TotalEnergies) | Jaber, Maysaa (TotalEnergies) | Mansoor, Khalid (TotalEnergies) | Sullivan, Luther (TotalEnergies) | Baud, Emmanuelle (TotalEnergies) | Su, Kun (TotalEnergies) | Zeeshan Baig, Muhammad (ADNOC) | Al Marzooqi, Hassan (ADNOC) | Van Laer, Pierre (ADNOC) | Alharthi, Amena D. (ADNOC) | Al Hashmi, Abdulla Ali (ADNOC) | Brooks, Trevor Daniel (ADNOC) | Al Arbai, Mohamed Elsayed (ADNOC)
Abstract The Diyab Formation is an organic-rich carbonate rock with low permeabilities and is one of the first unconventional targets to emerge in the Middle East. Vertical and horizontal exploration wells were drilled during the past years with proven productivity in the United Arab Emirates (UAE). Coupled geomechanical and reservoir characterizations of the Diyab formation are crucial for the successfulness of Stimulated Rock Volume (SRV) Creation and hydraulic fracturing operations which can have a direct impact on production performance. The objective of this study was to perform a full characterization of the Diyab formation based on extensive datasets that include logs and cores. The outcome of this integrated characterization work is used to assess the behavior of the Diyab formation across the concession block. First, we present the geology and general context of the studied area. Next, we detail the current understanding of the structural lineaments and natural fractures across the block. Then, based on full characterization work originating from data acquired on exploration and appraisal wells, we show how the results of geomechanical characterization together with the analysis of reservoirs quality/geological data allow us to suggest a vertical sub-division for Diyab formation. We explain further how the reservoir/geology, geomechanical parameters and natural fractures change laterally between wells. Reservoir characterization work concluded that there are some lateral variabilities in Diyab formation such as the change in the thickness/mineralogy of the carbonate bench and thickness of the porous wackestone. Some lateral variations in geomechanical/SRV parameters are observed within the block, resulted mainly from change in natural fractures density and properties of the carbonate bench and porous wackestone. This work is the first result of the integration of the current available data and the knowledge on Diyab formation, which could potentially evolve with the acquisition of new data and analyses. The combination of a full geomechanical characterization with a reservoir quality and structural geology study allows to propose a detailed reservoir and geomechanical sub-division for the Diyab formation. This approach will aid to better understand the lateral variability of facies, reservoir quality and geomechanical properties within the block which are crucial for successful development of this unconventional play.
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Diyab Formation (0.99)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Araej Formation (0.99)
- Asia > Middle East > Saudi Arabia > Eastern Province > Arabian Basin > Jafurah Basin (0.99)
- (2 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Management > Energy Economics > Unconventional resource economics (1.00)
Abstract The Jurassic stratigraphy of the Middle East includes the world's most economically significant petroleum systems, containing multiple world-class source, reservoir and seal packages. Yet in a regional context, these depositional systems are still not fully understood, leading to inconsistencies in lithostratigraphic nomenclature across international boundaries and misconceptions in the stratigraphic architecture limiting exploration and production success. We have applied sequence stratigraphic principles across the Jurassic strata of the eastern Arabian Plate to increase stratigraphic understanding and resolve some of the common misconceptions. This provides a robust age-based framework to reduce lithostratigraphic uncertainty across international boundaries and provides predictive capabilities into the temporal and spatial distribution of source, reservoir, and seal facies. Herein, we focus on one of these stratigraphic misconceptions, which deals with the development and sedimentary infill of the Late Jurassic Gotnia Basin, and its relationship with the aggrading platform of the Rimthan Arch. Our literature based re-interpretation proposes a mostly eustatically driven control, whereby the shallow water platform of the Rimthan Arch followed sea level rise, and the Gotnia Basin became a starved intra shelf basin. This revised stratigraphic interpretation has important consequences for the lateral facies relationships, and overall tectono-sedimentary understanding of the area, as well as for the petroleum habitat.
- Asia > Middle East > Iraq (0.71)
- Asia > Middle East > Saudi Arabia (0.49)
- Asia > Middle East > UAE (0.47)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Structural Geology > Tectonics > Plate Tectonics (0.73)
- Geology > Geological Subdiscipline > Stratigraphy > Sequence Stratigraphy (0.67)
- Asia > Middle East > Saudi Arabia > Arabian Gulf > Hanifa Formation (0.99)
- Asia > Middle East > Saudi Arabia > Arabian Gulf > Arabian Basin > Arabian Gulf Basin > Berri Field > Hanifa Formation (0.99)
- Asia > Middle East > Saudi Arabia > Arabian Gulf > Arabian Basin > Arabian Gulf Basin > Berri Field > Hadriya Formation (0.99)
- (6 more...)
Stratigraphic Evolution and Reservoir Quality of the Tuwaiq Mountain and Hanifa Formations, Onshore and Offshore Abu Dhabi
Tendil, Anthony J.-B. (Badley Ashton & Associates Ltd, Al Ghaith Tower, Hamdan Street, Abu Dhabi, United Arab Emirates) | Galluccio, Laura (Badley Ashton & Associates Ltd, Winceby House, Winceby, Horncastle, Lincolnshire, United Kingdom) | Hatter, Stuart (Badley Ashton & Associates Ltd, Winceby House, Winceby, Horncastle, Lincolnshire, United Kingdom) | Letteron, Alexandre (Badley Ashton & Associates Ltd, Al Ghaith Tower, Hamdan Street, Abu Dhabi, United Arab Emirates) | Breislin, Catherine (Badley Ashton & Associates Ltd, Winceby House, Winceby, Horncastle, Lincolnshire, United Kingdom) | Tameemi, Kate Al (ADNOC Upstream Exploration, Abu Dhabi, United Arab Emirates) | Aitken, John (ADNOC Upstream Exploration, Abu Dhabi, United Arab Emirates)
Abstract The stratigraphic evolution and reservoir quality development of the Upper Jurassic Tuwaiq Mountain and Hanifa formations (Sila Group) has been investigated through a regional core-based study covering both onshore and offshore Abu Dhabi. This follows recent renewed exploration interest that aims to fully assess the conventional potential of these two formations. Based on the core description of 13 wells across a distance of 280 km, the lateral and vertical stratigraphic evolution of the proximal settings of the Tuwaiq Mountain and Hanifa formations has been assessed at a regional scale. Each formation describes a large scale, 3rd-order shallowing-upward trend, respectively from muddy basinal/slope deposits to grainstone-dominated inner ramp sediments in the Tuwaiq Mountain Formation, and from mud- to packstone-dominated inner ramp deposits to grainstone-dominated fabrics in the Hanifa Formation. Large facies belts likely characterised the depositional environment of both formations, with an increasing predominance of proximal inner ramp settings over time due to the overall westward progradation of the carbonate system. Of interest is the preferential deposition of oolitic and/or skeletal grainstone deposits towards the edge of the rim where they form kilometre- to decakilometre-scale high-energy shoals broadly orientated N-S (parallel to the slope). Special emphasis has been placed on assessing the regional thickness variations of both the Tuwaiq Mountain and Hanifa formations, which are not yet fully understood. Several assumptions, based on core data and/or 3D seismic data, have been made to improve consistency and refine the picking of the boundary between the Tuwaiq Mountain and Hanifa formations. The description of 200 representative thin-sections, along with SEM and modal/textural analyses performed on selected samples, confirmed that the development of reservoir quality in both formations is primarily controlled by depositional parameters. The best reservoir potential is hosted within the high-energy grainstone deposits in which a vast amount of primary interparticle macropores formed at deposition. The abundance of latter macropores is a function of grain sorting and grain size, these two parameters being quite variable throughout the Tuwaiq Mountain and Hanifa formations. Subsequent post-depositional preservation of these primary macropores is explained by limited cementation coupled with successive pore-enhancing events (ie. dissolution events), which re-opened primary macropores and created secondary macropores, as well as enhanced microporosity. The uppermost parts of the Tuwaiq Mountain and Hanifa formations constitute the best reservoirs, as a result of the widespread deposition of grainstone in the study wells. By assessing the lateral and vertical stratigraphic evolution of these underexplored formations and identifying their reservoir potential, this study provides valuable insights that could help guide future exploration and production activities in the region.
- Asia > Middle East > Saudi Arabia > Arabian Gulf (1.00)
- Asia > Middle East > Bahrain (1.00)
- Asia > Middle East > UAE > Abu Dhabi Emirate > Abu Dhabi (0.74)
- Geology > Sedimentary Geology (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Asia > Middle East > UAE > Arab Formation (0.99)
- Asia > Middle East > Qatar > Arabian Gulf > Arabian Basin > Arabian Gulf Basin > Block 6 > Al Khalij Field > Mishrif Formation (0.98)
- Europe > Norway > Norwegian Sea > Ile Formation (0.97)
- (7 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (0.94)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.68)
Abstract A comparison of the Araej section cropping out in Wadi Naqab (southeast of Ras Al Khaimah in the UAE) with the subsurface of Abu Dhabi and nearby areas shows that the Araej Formation of onshore and offshore Abu Dhabi is very similar to that of Qatar. The surface section was compared to well data using core petrography, biostratigraphy, characterization of the cycles and depositional environments and sequence stratigraphic analysis. The Araej Formation corresponds to the section between the top of the Izhara and the base of Tuwaiq Mountain Formation. The age of the Araej section of Wadi Naqab succession, similarly to the subsurface, ranges from Bathonian to Callovian. In Wadi Naqab, the cyclic section equivalent to the Araej Formation comprises five sequences. The recently defined Arabian Maximum Flooding Surfaces, J30 and J40 are evident in Wadi Naqab. J30 coincides with the MFS of the first Bathonian sequence, in the lower part of the Lower Araej, while J40 can either be located near the top of Uweinat or near the base of Upper Araej. The Uweinat is composed mainly of grainstones, micropeloidal in the lower and middle parts and oolitic and cross-bedded in several horizons throughout the section. Stromatoporoid and coral rudstones occur in the upper half. The Uweinat of Wadi Naqab seems similar to the offshore Uweinat reference section of well US-2, where reworked stromatoporoides were also recorded in the upper Uweinat. As a result of regional correlations, the Araej section of a well of NE Abu Dhabi is proposed as the onshore reference section of the Araej Formation of Abu Dhabi. The Sequence Stratigraphic interpretation with the identification of the Maximum Flooding Surfaces provides better chronostratigraphic control enhancing prediction accuracy of the geometric relationship of source, reservoir and seals. A better characterization of the Araej Reservoirs will support the regional correlation, exploration and production of the Middle Jurassic of the Middle East. Introduction The Middle Jurassic of the subsurface of Abu Dhabi comprises the Izhara and Araej formations Fig. 1. Recent, studies of the Araej Formation of Qatar of offshore Abu Dhabi and Qatar and part of the UAE have contributed to a better understanding of the litho-biostratigraphy, depositional setting, reservoir characteristics and hydrocarbon occurrences of the Araej Formation in southern Arabia. Little has been published, however, concerning the characteristics of the Araej Formation in onshore Abu Dhabi. This study shows that, as far as the lithology and biota are concerned, the Araej Formation of onshore and offshore Abu Dhabi is very similar to that of Qatar. Therefore this section will include only a summary of the major litho- and biostratigrapic characteristics of the Araej Formation. The emphasis will be placed on the characteristics of the fossil assemblage recognised in onshore Abu Dhabi in order to facilitate the comparison of the Middle Jurassic section of Wadi Naqab with that of the Araej Formation of the subsurface. The following results were derived by the integration of the information obtained by the revision of inhouse reports and recent sequence stratigraphic studies together with a review of core data. A re-interpretation of those results was made, when necessary, to bring them up to date or to correct errors. Stratigraphic and Sedimentological Revision of the Araej Formation Type and reference sections. The type section of the Araej Formation is in Qatar Petroleum Company well Kharaib-1, where this formation is 180 m thick. The offshore Abu Dhabi reference section is 230 m thick and is in ADMA well Umm Shaif-2 (US-2). The onshore reference section defined in this study is in ADCO onshore well J-1 of NE Abu Dhabi Fig. 3 (see Fig. 2 Legend for Figs. 3, 4, 6, 7 &8), where the Araej Formation reaches a thickness of 261 m. Type and reference sections. The type section of the Araej Formation is in Qatar Petroleum Company well Kharaib-1, where this formation is 180 m thick. The offshore Abu Dhabi reference section is 230 m thick and is in ADMA well Umm Shaif-2 (US-2). The onshore reference section defined in this study is in ADCO onshore well J-1 of NE Abu Dhabi Fig. 3 (see Fig. 2 Legend for Figs. 3, 4, 6, 7 &8), where the Araej Formation reaches a thickness of 261 m.
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Stratigraphy > Sequence Stratigraphy (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > Middle East Government (0.68)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Ghasha Concession > Umm Shaif and Nasr Block > Umm Shaif and Nasr Field > Umm Shaif Field > Arab Formation (0.99)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Araej Formation (0.99)
- Asia > Middle East > Saudi Arabia > Eastern Province > Arabian Basin > Jafurah Basin > Tuwaiq Mountain Formation (0.99)
- (4 more...)