Marine Depositional Environments Basics Carbonate Diagenesis. (Last Updated 28 December 2015) COPYRIGHT

Marine Depositional Environments Basics (Last Updated 28 December 2015)

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DELIVERING KNOWLEDGE. DEVELOPING COMPETENCE. Marine Depositional Environments Basics Depositional Environments Processes and examples from modern and ancient environments with oil field examples Subaerial Alluvial fan Fluvial braided and meandering Aeolian wind and desert Marginal marine Delta river, wave, tide dominated, fan delta, braid delta Beach and barrier island Marine Submarine fan channel-levee complex, Bouma sequence Carbonates limestone, dolomite Reef, platform, pinnacle, pelagic Diagenesis 2015 PetroSkills, LLC. All rights reserved. 2 1

Objectives of the Carbonates Diagenesis Session You will learn about: Enhancement and / or loss of carbonate reservoir quality Changes in porosity and permeability through diagenesis Types of secondary porosity in Carbonates Moldic Vuggy Cavernous Skeletal and Oomoldic Fracture 2015 PetroSkills, LLC. All rights reserved. Diagenesis in carbonates can raise or lower reservoir quality 3 2015 PetroSkills, LLC. All rights reserved. 4 2

A Vug in Cretaceous Carbonates, Jebel Haffit, UAE 2015 PetroSkills, LLC. All rights reserved. 9 Continued Dissolution and You Get Cavernous Porosity Caverns filled in by reddish surface soils Disappearing Rivers? 2015 PetroSkills, LLC. All rights reserved. 10 5

Partially Filled Vugs Partial infilling of vug. Notice rough looking texture Close up on next slide 2015 PetroSkills, LLC. All rights reserved. 11 Jebel Haffit, UAE 2015 PetroSkills, LLC. All rights reserved. 12 6

Skeletal and OO-Moldic Porosity Is porosity effective? Is there any Permeability? 2015 PetroSkills, LLC. All rights reserved. 17 Intragranular Porosity within a Bryozoan Is porosity effective? Is there any Permeability? 2015 PetroSkills, LLC. All rights reserved. 18 9

Limestone in Lilstock, UK Four sets of solution enhanced farctures Bristol Channel in the background Implications for porosity and permeability of such a reservoir? 2015 PetroSkills, LLC. All rights reserved. 21 Cemented Fractures Banff, Canada 2015 PetroSkills, LLC. All rights reserved. 22 11

Solution Enhancement of Fractures: Jebel Haffit, UAE Potential for drilling hazards, bit drops, lost circulation, jamming, stuck pipe, kicks Fractures as Friend and Foe 2015 PetroSkills, LLC. All rights reserved. 23 Objectives of the Carbonates Diagenesis Session You have learned about: Enhancement and / or loss of carbonate reservoir quality Changes in porosity and permeability through diagenesis Types of secondary porosity in Carbonates Moldic Vuggy Cavernous Skeletal and Oomoldic Fracture 2015 PetroSkills, LLC. All rights reserved. 24 12