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Johannes Schoenherr Supervisors: Janos L. Urai, Peter A. Kukla, Ralf Littke Petroleum Development Oman The Evolution of Halite and solid Bitumen in the.

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Presentation on theme: "Johannes Schoenherr Supervisors: Janos L. Urai, Peter A. Kukla, Ralf Littke Petroleum Development Oman The Evolution of Halite and solid Bitumen in the."— Presentation transcript:

1 Johannes Schoenherr Supervisors: Janos L. Urai, Peter A. Kukla, Ralf Littke Petroleum Development Oman The Evolution of Halite and solid Bitumen in the Petroleum System of the South Oman Salt Basin

2 100 km The geology of Oman

3 The Petroleum System of the SOSB after Qobi, km after Qobi, 2001

4 Surface-piercing Salt Domes of interior Oman 100 km after Qobi, km

5 Surface piercing Salt Domes - Qarn Sahmah 3 km N Dome size: 2.8 x 2.5 km Height: 100 m

6 Salt Dome Qarn Sahmah

7 View from a flank of Salt Dome Qarn Kibrit

8 Salt Dome Qarn Alam

9 I cm ----I Rocks of the surface-piercing Salt Domes seal reservoir source rock

10 hydrostatic RFT  1 AND  3 in salt RFT Formation pressures of SOSB In-situ stress and pore pressures

11 Stratigraphy & Geometry of Ara Group GoCAD 3D model Stringers A1c –yellow A2c – red A3c – blue View from west, Top Salt colour-coded by depth, with boreholes. Note absence of stringers under Haima basin after Droste, 2001

12 Key aspects of project 1. Evolution of Halite A) Study of halite-plugged carbonate stringers Plugging mechanism Diagenesis B) Study “Ara Salt” Microstructures Rheology 2. Evolution of solid Bitumen Plugging mechanism Methods: Microstructural investigation RockEval biomarker analysis GC analysis Maturity analysis (BR-% measurement)

13 Problem statement Some wells have failed to produce at significant rates (Al-Abry, 2004) Detailed core analysis of one stringer revealed extensively plugging with salt and solid bitumen (Al-Siyabi, 2005)

14 Outlook & aims Problem statement Some wells have failed to produce at significant rates (Al-Abry, 2004) Detailed core analysis of one stringer revealed extensively plugging with salt and solid bitumen (Al-Siyabi, 2005) Aims Understand the plugging mechanisms Understand the spatial distribution of Halite and solid Bitumen inside the stringers (Al-Siyabi, 2005) Give a contribution to predict reservoir quality of stringers

15 2 cm Case study of the sealing capacity of Halite 1 cm thin section Under what conditions salt can leak?

16 Summary of PhD contents 1.Study of Salt Domes Aim: Comparison of facies and HC-potential with SOSB- rocks 2.Study the diagenetic evolution of carbonate stringers Aim: Contribute to give a better prediction for reservoir quality 3.Case study of the sealing capacity of Halite


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