For Questions call John Dribus 504-232-2221, jdribus@hotmail.com The Exploration and Discovery History of the Guyana- Ghana Conjugate Equatorial Corridor John R. Dribus, Global Geologist and Advisor, Dribus Geologic Consulting LLC Dribus Geologic Consulting LLC May, 2019
In creating this overview of the Guyana play, Dribus Geologic Consulting (DGC) has utilized various digital and industry data bases and reports from the public domain as input data. Sometimes these data sources do not agree. DGC has made every For Questions call John Dribus 504-232-2221, jdribus@hotmail.com reasonable effort to reconcile such differences and select the most accurate information. However DGC is not responsible for any errors or incorrect attributions within the public domain, and does not represent or warrant that such material is complete, the most current, or most accurate. Consequently, DGC assumes no liability or responsibility for any errors or omissions in the content of this material. These contents are provided on an “as is” basis with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information. DGC does not claim ownership of or responsibility for any material that has been obtained from the digital public domain, and is not liable for any damages, whether direct, indirect, incidental, special, or consequential, arising out of or in connection with the use of this material. DGC LLC March, 2019 Dribus Geologic Consulting LLC May, 2019
2018 Top Ten Exploration Discoveries For Questions call John Dribus 504-232-2221, jdribus@hotmail.com 13 Discoveries 5.5 Bboe Recoverable Modified after https://energynorthern.com/2018/12/17/the-oil-and-gas-exploration-winners-of-2018/ Dribus Geologic Consulting LLC May, 2019
Top Ten Exploration Companies in 2018 For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Guyana https://www.ogj.com/articles/2019/01/rystad-energy-exxonmobil-leads-pack-of-top-explorers-in-2018.html Dribus Geologic Consulting LLC May, 2019
Location of Major DW Discoveries and Their Reservoir Rocks For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Ta Ta Ta Ta Ta C C C C Ta Ta Ta Ta C Ta C Ta Ta C Ta Ta C Ta C Ta Ta Ta? Base map from www.columbia.edu/cu/news/01/07/marieTharp.html C Denotes carbonate Systems Ta Denotes Bouma “A” Fan turbidite systems Dribus Geologic Consulting LLC May, 2019
Reservoir Characterization of Targets Ta: Deep water Turbidites (more liquid systems) clastic sandstone reservoirs For Questions call John Dribus 504-232-2221, jdribus@hotmail.com • Basin Floor Fan Systems (like Jubilee, Ghana and Shell Perdido, GoM) • Possible water-support, lower rock properties with higher rock volume • Channelized Systems (like GoM Tahoe, and TEN Field Complex in Ghana) • Most likely pressure depletion, higher rock properties with lower rock volume C: Carbonate Reservoir (more gas) in reefs, (more oil) in microbialites (pre-salt) • Reefs and biological buildups (Zohr in Egypt and Calypso in Cyprus, Ranger???) • Very high column heights, very large areas and rock volume, top seal issues. • Microbialites/Stromatolites/Bioclastic grainstones (like Brazil pre-salt) • High CO2, possible H2S, very high flow rates, long lived production • Fractured carbonates, coquina grainstones, and bioclastic debris flows (reef rubble). J Dribus 2019 Dribus Geologic Consulting LLC May, 2019
The Atlantic Ocean Basin and Mid-Atlantic Ridge (MAR) For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Ghana Guyana 7 Dribus Geologic Consulting LLC May, 2019
Review of Plate Divergence For Questions call John Dribus 504-232-2221, jdribus@hotmail.com abyss.uoregon.edu/~js/images/plate_ev.gif Dribus Geologic Consulting LLC May, 2019
Seven Current Key Deep water Exploration Plays 4. N. Sea Havis For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Turbidites 5. E Mediterranean Gas 3. Transform 1. Gulf of Mexico Turbidites Lower Tertiary Turbidite Fans 6. E. Africa Turbidites 7. NW Australia 2. Brazil Dorado Oil Play Presalt Base map from www.columbia.edu/cu/news/01/07/marieTharp.html Base map from www.columbia.edu/cu/news/01/07/marieTharp.html Dribus Geologic Consulting LLC May, 2019
Kosmos Jubilee Field, Offshore Ghana , 2007 The Kosmos Mahogany-1 discovered a hydrocarbon For Questions call John Dribus 504-232-2221, jdribus@hotmail.com column of 270 meters (885 feet) of net oil pay in three stacked turbidite fan reservoirs in 2007. The amalgamated fan discovery is now known as the Jubilee Field. The channel and splay Jubilee discoveries are now known as the TEN Field. OFFSHORE: Tullow looking to extend prolific deepwater Ghanaian play Published: Oct 1, 2010 Exploration focus shifts towards Liberia, Latin America Jeremy Beckman Editor, Europe Dribus Geologic Consulting LLC May, 2019
Dip Line and Map Showing Structural Influence on Trap For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Modified after Exploration for Cretaceous stratigraphic traps in the Gulf of Guinea, West Africa and the discovery Jubilee Field: a play opening discovery in the Tano Basin Offshore Ghana. Geological Society, London, Special Publications Online. First published July 31, 2012; doi 10.1144/SP369.12 Geological Society, London, Special Publications v.369, first and Phil Lowry Paul Dailly, Tracey Henderson, Eric Hudgens, Kathy Kanschat Dribus Geologic Consulting LLC May, 2019
Types of Sediment Turbidity (Gravity) Flows For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Hyperpycnite (Hybrid) With Permission from Dr. Roger Slatt, 2015 Dribus Geologic Consulting LLC May, 2019 http://www.carec.com.pe/biblioteca/biblio/6/48/7%20Deepwater%20-%201.pdf
Bouma Turbidite Sequence Modified from skywalker.cochise.edu/.../pglnx/chapter10x.htm • Arnold Bouma (1962) proposed a turbidite classification scheme that relates lithology and texture to flow processes and energy. The model assumes waning flow (negative For Questions call John Dribus 504-232-2221, jdribus@hotmail.com acceleration with respect to time). • This model is by far the most used facies classification scheme for turbidites in the literature today. Outcrop Core Lithofacies Model Ta Td Te HHemipelagic V Fine Mud Laminated Muds Td Finer Cross Tc Bedded Silts Finer Laminated Sediment Tb Massive Coarse Sediment Ta Dribus Geologic Consulting LLC May, 2019 13 http://www.carec.com.pe/biblioteca/biblio/6/48/7%20Deepwater%20-%201.pdf
Layered Amalgamated Bouma Sequences Ta/b Sequences Creates a sand that For Questions call John Dribus 504-232-2221, jdribus@hotmail.com If the mud member survives, appears to be massive, a layered sheet sequence is but is actually an deposited with much amalgamated series of Less storage space Bouma a/b sequences. Dribus Geologic Consulting LLC May, 2019 Modified from skywalker.cochise.edu/.../pglnx/chapter10x.htm
Three Components of Deep water Deposition 1. Continual pelagic rain of fines from suspension creating ductile mud layers 2. Periodic falling stage lateral mass transport mud flows coming down the For Questions call John Dribus 504-232-2221, jdribus@hotmail.com slope to form brittle shale units 3. Lowstand turbidity currents that deposit cyclic, lateral basin floor fans Shelf CONTINUAL PELAGIC RAIN Ductile Pelagic Shales Abyssal Plane (Modified from Morris, 1971) J. Dribus 2018 Dribus Geologic Consulting LLC May, 2019
The Turbidite Reservoir Sandwich 1. Pelagic fines from suspension creating ductile mud layers For Questions call John Dribus 504-232-2221, jdribus@hotmail.com 2. Periodic lateral mud flows coming down the slope as brittle shale layers 3. Cyclic, lateral basin floor fan reservoir rocks (Modified from Morris, 1971) J. Dribus 2018 Dribus Geologic Consulting LLC May, 2019
Jurassic 125 MYA: Asymmetric Rifting Initiates in South For Questions call John Dribus 504-232-2221, jdribus@hotmail.com As the southern area rifts, the north margin begins to slide apart along a major stair-stepped transform system (Special Permission from C.R.Scotese, 2012) Dribus Geologic Consulting LLC May, 2019
The Late Cretaceous Major Transforms and Jubilee For Questions call John Dribus 504-232-2221, jdribus@hotmail.com NA These major shear systems sever the rift and create a transform basin between them with high gradient margins and major clastic sediment influx. (Special Permission from C.R.Scotese, 2012) Dribus Geologic Consulting LLC May, 2019
Beginning with Jubilee in Ghana: Extending the Play Westward For Questions call John Dribus 504-232-2221, jdribus@hotmail.com Exploration began with the discovery of Jubilee in Ghana and moved westward to Liberia and Sierra Leone. Then the jump was made across the Atlantic to the conjugate Zaedyus discovery in French Guyana Dribus Geologic Consulting LLC May, 2019
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