THE NIGER DELTA PROVINCENIGERIA

CRISTIANO ASCOLANI, PHILIPP MESTERS, JEAN-MARC SÖLDNER

PETROLEUM GEOLOGY I – SS 2014

Fig. 1: Satellite picture from Niger delta

2

Nigeria: general facts

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

• 9°04'55.80''N8°14'31.00''E

• Altitude: 417 m• Total surface: 923.768 km²• Capital: Abuja• Independence day: 1st october

1960

Fig. 2: Geographical map of Nigeria

3

The Niger Delta

• Wave-dominated morphology• Extension: 70 000 km²• Width: 200 km• Average flow rate: 30 000 m³/s• Comprising of clastic sequence

up to 12 km thick

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 3: Coastal line of the Niger delta Fig. 4: Delta-mode diagram

4THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Rifting events

Fig. 5: Rifting events chart through the Cretaceous

5

Petroleum deposits

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 6: Map of the Niger delta's petroleum deposits

6

Geological overview

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014 Fig. 7: Geological map of Nigeria

7THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Facies distribution of the Niger Delta

Fig. 8: Maps showing the geological setting of the Niger delta in a section

8

The Niger Delta

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 9: Geological section through the sedimentary layers of the Niger delta's mouth

9

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Structural pattern

Fig. 10: Geoligical section through the Agbada-Akata-formation showing sedimentary deposits and time-line feautures

10

Structural pattern

• Mostly, oil occurs intectonical structuresas roll-over anticlines

• Roll-over structures are due to listric fault extensions

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 11: Structural pattern of the Niger delta's rock units

11

Stratigraphy of the Niger Delta

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 12: Stratigraphic column

12

Events chart

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 13: Petroleum events chart of the Agbada-Akata-formation

13

Reservoir data analysis

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014Fig. 14: Position of the five oil fields

14

Reservoir parameters

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

• Porosity• Permeability • Water/Hydrocarbon saturation

• Net-to-gross ratio

15

Reservoirs dataset

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 15: Petrophysical datas about the five oil fields concidered

16THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Reservoirs dataset

Fig. 16: Petrophysical datas about the five oil fields concidered

17

Graphical explanation

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014 Fig. 17 Graphical representation of the petrophysical parameters

18

Graphical explanation

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Fig. 18) Comparison of the petrophysical values in the different oil fields

19

Oil chemical features

THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

Light oil: • Waxy and parafine based

(5-20%)• API gravity: 30-40°

Heavy oil: • API gravity: 8-20°

Niger Delta oil:• Light oil 85%• Heavy oil 15 %

Fig. 19) Oil properties

20THE NIGER DELTA PROVINCE- PETROLEUM GEOLOGY I – SS 2014

References• 1) Wikipedia.org• 2) http://education.randmacnally.com/• 3) Google earth• 4) modified after Galloway W., 1975• 5)+6) Michele W. L. et al., 1999• 7)

http://aapgbull.geoscienceworld.org/content/89/6/753/F2.large.jpg

• 8) modified after USGS• 9) modified after

http://aapgbull.geoscienceworld.org/content/89/6/753/F2.large.jpg

• 10) modified after Opara, A. I. et al, 2013• 11) modified after USGS• 12) modified after USGS and Whiteman, 1982• 14) modified after Google earth• 19) modified after USGS

THANK YOU FOR YOUR ATTENTION!