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PETROLEUM GEOLOGY OF MESOPOTAMIAN BASIN OF IRAQ

BASIN DATA & EVALUATION PACKAGE

1. Location and National Data

2. General Basin Data

3. Tectonic Setting

4. Basin Type
- General features
- Passive margin
- Contents
- Active margin/borderland
- Descriptive summary

5. Basin Configuration

- Basin shape
- Principal trend(s)
- Subsidiary trend(s)
- Basin margins

6. Tectonic Development and History

7. Structural Evolution

8. Basement (Precambrian and Infracambrian Stratigraphy)

9. Phanerozoic Stratigraphy

10. Depositional Environments

- Characteirstics of carbonate depositional facies
- Characteirstics of clastic depositional facies

11. Geologic History

- Effects of global eustatic sea-level variations and tectonism
- Depositional history
- Unconformities and non-deposition

12. History of Exploration

13. Exploration and Production Results

- Basin production
- Basin exploration
- Production
- Commercial fields
- Undeveloped/underdevelopment fields

14. Hydrocarbon Indications (oil and and gas seeps and shows)

15. Petroleum Systems

- Paleozoic
- Jurassic
- Cretaceous

16. Hydrocarbon Source Rocks

17. Hydrocarbon Migration and Thermal Maturation

- Migration pathways
- Hydrodynamic framework
- Geodynamic evolution to hydrocabron accumulation
- Thermal maturation

18. Reservoir Characteristics

19. Traps and Traping Mechanism

20. Seals

21. Future Potential Play Concepts

22. General Oil and Gas Evaluation

I. Present Hydrocarbon Potential and Exploration Rating

- Summary

II. Exploration Potential and Risk/Volume Facor Ratings

A. General Hydrocarbon Exploration Potentail
- Oil
- Gas & NG Liquids
B. Risk Factor Rating
- Source rock potential
- Reservoir potential
- Hydrocarbon migration probability
- Trap potential
- Seal potential
C. Volume/Size Factors Rating
- Size and basin area
- Area left to expore
- Number of oil/gas fields expected
- Mean size and largest oil and gas fields expected
- Volume of discoverable reserves

23. Oil and Gas Summary

- Balad
- Buzurgan
- Dujailah
- East Baghdad
- Haifaya
- Kifl
- Luhais
- Majnoon
- Nahr Umr
- Rachi
- Ratawi
- Rumaila
- Samawa
- Siba
- Tuba
- West Baghdad
- West Qurnah
- Zubair

24. Selected References

LIST OF TABLES
Table 1: Tectonic Development.
Table 2: Main source rocks formations in the Mesopotamian Basin, Iraq.
Table 3: Main reservoir characteristics in the Mesopotamian Basin, Iraq.
Table 4: Main Seals (cap rocks) in the Mesopotamian Basin, Iraq.
Table 5: Risk-discounted volume rank of basin. Volume of undiscovered (recoverable) oil and gas reserves.
Table 6: Reserves and production as of year 2000.
Table 7: Data for Rumaila North Field.
Table 8: Data for Rumaila South Field.
Table 9: Data for Buzurgan Field.
Table 10: Data for Zubair Field.
Table 11: Data for Haifaya Field.
Table 12: Data for Kifl Field.
Table 13: Data for Luhais Field.
Table 14: Data for Siba Field.
Table 15: Data for Tuba Field.
Table 16: Data for West Qurnah Field.
Table 17: Data for West Baghdad Field.
Table 18: Data for Samawa Field.
Table 19: Data for Ratawi Field.
Table 20: Data for Rachi Field.
Table 21: Data for East Baghdad Field.
Table 22: Data for Dujailah Field.
Table 23: Data for Majnoon Field.
Table 24: Data for Nahr Umr Field.
Table 25: Data for Balad Field.

LIST OF FIGURES
Figure 1: Structural scheme of the Arabian Plate and its margin, showing tectonic network and sedimentary accumulations.
Figure 2: Gravity buguer anomalies, Iraq.
Figure 3: Basement depth from aeromagnetic interpretation, Iraq.
Figure 4: Schematicized regional correction of Mesozoic-Cenozoic rock units in Iraq.
Figure 5: Upper Miocene-Pliocene facies.
Figure 6: Middle Miocene facies.
Figure 7: Lower Miocene facies.
Figure 8: Oligocene facies.
Figure 9: Eocene facies.
Figure 10: Paleocene-Lower Eocene facies.
Figure 11: Turonian-Lower Campanian facies.
Figure 12: Cenomanian-Early Turonian facies.
Figure 13: Albian facies.
Figure 14: Lower Berriassian-Aptian facies.
Figure 15: Upper Jurassic facies.
Figure 16: Upper Jurassic-Early Berriasian facies.
Figure 17: Dogger facies.
Figure 18: Liassic facies.
Figure 19: Upper Triassic facies.
Figure 20: Lower-Middle Triassic facies.
Figure 21: Upper Carboniferous-Upper Permian facies.
Figure 22: Structural cross-section and hydrocarbon maturity levels of selected boreholes from west, central and southern Iraq.
Figure 23: Geothermal gradient and time-temperature maturation model of geologic sequence of Tuba 1 well, Iraq.
Figure 24: Geothermal gradient and time-temperature maturation model of geologic sequence of Dujaila 1 well, Iraq.
Figure 25: Geothermal gradient and time-temperature maturation model of geologic sequence of Safawi 1 well, Iraq.
Figure 26: Main tectonic regions and hydrocarbon systems of Iraq. The stable shelf zone corresponding to the Western and Southwestern deserts presents the best Paleozoic targets. Most of all oil reserves in Iraq are found in the eastern part of the country; mainly in Cretaceous reservoirs in the Mesopotamian Basin, Tertiary reservoirs in the southern part of the Low Folded Zone and Cretaceous to Triassic reservoirs in the northwestern part of the Low Folded Zone.
Figure 27: Approximate and probable distribution of source rocks in Iraq and location of wells used for burial history.
Figure 28: Burial curve. Datum is top Sargelu Formation, geothermal gradient = 1.2 F/100. (locality 1, 2, 3)
Figure 29: Burial curve. Datum is top Sargelu Formation, geothermal gradient = 1.2 F/100. (locality 4, 5, 6)
Figure 30: Burial curve. Datum is top Sargelu Formation, geothermal gradient = 1.2 F/100. (Falluja 1 and 2).
Figure 31: Distribution of oil reserves of Iraq.