johannes schoenherr supervisors: janos l. urai, peter a. kukla, ralf littke petroleum development...
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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 Petroleum System of the South Oman Salt Basin
100 km
The geology of Oman
The Petroleum System of the SOSB
after Qobi, 2001
100 km
after Qobi, 2001
Surface-piercing Salt Domes of interior Oman
100 kmafter Qobi, 2001
100 km
Surface piercing Salt Domes - Qarn Sahmah
3 km
N
Dome size: 2.8 x 2.5 kmHeight: 100 m
Salt Dome Qarn Sahmah
View from a flank of Salt Dome Qarn Kibrit
Salt Dome Qarn Alam
I---- 4 cm ----I
Rocks of the surface-piercing Salt Domes
seal
reservoir
source rock
1000
2000
3000
4000
5000
0 20000 40000 60000 80000 100000 120000
Formation Pressure (kPa)
hydrostaticRFT
1 AND 3 in salt
RFT
Formation pressures of SOSB
In-situ stress and pore pressures
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 basinafter Droste, 2001
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)
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)
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
2 cm
Case study of the sealing capacity of Halite
1 cmthin section
Under what conditions salt can leak?
Summary of PhD contents
1. Study of Salt DomesAim: Comparison of facies and HC-potential with SOSB-rocks
2. Study the diagenetic evolution of carbonate stringersAim: Contribute to give a better prediction for reservoir quality
3. Case study of the sealing capacity of Halite