petroleum play of central indus basin

1. Central Indus Basin
• INTRODUCTION
• SOURCE ROCKS
• RESERVOIR ROCKS
• SEAL ROCKS
• TRAPPING MECHANISM
• TECTONIC FRAMEWORK
• DRILLING HISTORY

2. Introduction
 Upper segment of Lower Indus Basin
 A gas prone province
 Includes Pakistan famous Sui gas field
 Three units.
1. punjab platform
2. sulaiman depression
3. sulaiman fold belt

3. Punjab platform
 Eastern segment of Central Indus Basin
 Dips westward in to Sulaiman depression
 Sargodha Ridge marks the north-eastern boundary
 Sukkr Ridge marks the southern boundry
 No surface outcrops of sedimentary rocks
 Seismic study have revealed the presence of pre-cambrian to
cambrian rocks in subsurface

4. Sulaiman depression
 Longitudinally oriented area of subsidence
 Formed as a result of collision between two plates
 Merges into punjab platform in the east

5. Sulaiman fold belt
 Western segment of Central Indus Basin
 Located near collision zone
 Contain large number of disturbed anticline features
 Contain oldest rocks of Lower Indus Basin i.e wulgai formation
of Triassic age

6. Source rocks
 Cretaceous: Sembar, Goru and Mughalkot formation
 Jurassic: Datta and Shinawari formation
 Eocene: kirthar formation contain Oil-Shale of TOC 11℅
Habib Rahi limestone have TOC 5.25℅

7. Reservoir Rocks
 Eocene: Sui main/Sui upper/Habib Rahi limestone
 Paleocene: Ranikot limestone/sandstone
 Cretaceous: Pab/lower goru sandstone
Cumulative thickness of reservoirs: 1,500m

8. Seal Rocks
 Marine mudstone of kussak formation
 Shallow Marine mudstone of Dandot formation
 Shales of Chhidru/Datta/Ranikot formation
 Ghazij shale are the regional seal in punjab platform

9. Trapping mechanism
Potential stratigraphic traps are
 Beneath base tertiary or base miocene unconformities
 fault-related structures
 Fluvial shales of Murree formation at some places

10. Tectonic framework
 Geologic Structures in Central Indus Basin were formed as a result of
Basement uplift and Compressional tectonics
 Basement uplift: Gentle Domal structures like khairpur, kandhkot and
Mari etc.
 Compression: Inner and outer Sulaiman folded zone
 These structures ranges from simple dome(sui) to complex Duplex
types(outer folded zone)

11. Punjab platform
 Tectonically stable area
 Regional scale monocline dipping gently towards
Sulaiman depression
 Tilted eastward in Paleozoic time due to non-orogenic movements
 Tilted westward since Mesozoic due to collision of Indian and Eurasian plate

12. Sulaiman depression

13. Sulaiman fold belt
 Represents compressional and strike-slip tectonics
 Represents thin-skinned tectonics where rigid Basement
is not playing any major role
 The sedimentary cover is Imbricated due to severe
compression and its intensity increases from northwards of sui

14. Drilling history