The Application of Well logging in Petrophysical Evaluation and Assessment of the Hydrocarbon Prospect in Abu Madi Reservoir, Abu Madi field, Onshore Nile Delta basin, Egypt
by : Fatma Gouda
Supervised by:
Dr. Ahmed Elbahrawy- Dr. Mohamed Sarhan
Exploration history
Exploration history
The first drilled well is Mit Ghamr-1
(Dry - reached the Upper Cretaceous)
Discovering the Abu Madi Field
(first success)
Rosetta-2 was the first well drilled offshore
First commercial discovery
Port Fuad (in Wakar formation)
Raven and Satis Fields opened up the deeper Miocene-Oligocene trends
Phase 5 of exploration in Egypt, more in interest in Offshore Miocene play
Figure 1. Nile Delta creaming curve and exploration advances.(Dolson.2018)
The Nile delta
Geological settings
- One of the largest deltas in the world as it comprises an area of ca. 25,000 km2.
- Represents a passive margin sedimentary basin that was initiated throughout the late-triassice early-cretaceous (may, 1991; dolson et al., 2001).
- Its holding about 223 trillion cubic feet of gas reserves in more than126 fields scattered in the Nile Cone (Kirschbaum et al. 2010) , where there discoveries ranges from Oligocene to Quaternary.
lithology
- The Nile delta’s depositional history was affected by Multiple tectonic activities and the changes of Mediterranean Sea level, as they controlled the Sediments supply and the accommodation area.
Tectonic and structure framework
Tectonic and structure framework
The offshore Nile Delta and northern Sinai have been subjected to many tectonic deformations during geological time (Abdel et al. 1994). During the Late Cretaceous Inversion, two-fold systems of the NE-SW and EW fold axes were created, each with differing sizes and amplitudes. A system of NE-trending fold axis is generated as a result of the transpressive movement of Rosetta and Temsah.
In the Mediterranean system, 9 fault trends (B fault systems) are recognized: •
- ENE-WSW sinistral Pelusium mega-shear zone of pre-Cambrian.
- E-W normal faults of Paleozoic).
- NE-SW reverse faults of Late Cretaceous.
- Arcuate normal fault zone (hinge zone Oligocene or older).•
- NE-SW right-lateral transpressive movement (Rosetta fault trend-Early Miocene)
- NW-SE right-lateral movement (Temsah trend -Middle Miocene).
- N-S Baltim normal fault trend (late Miocene).
- NW normal fault zone (Clysmic trend -Eocene-early Miocene)
- NNE normal faults zone (Aqaba trend-Miocene to present).
Figure.4 Regional structural map of Nile Delta and gas-producing fields (Hanafy et al. 2017)
seal and trap
Fig.5 Play schematic of the Nile Delta. Modified from Dolson et al. 2001
Significant newly found gas fields
Fig.6 Some of the hydrocarbon filed of Egypt (Source: Eni)
Zohr field
Zohr Gas Field
- Zohr is the largest offshore natural gas in Egypt and the Mediterranean Sea.
- The discovery could hold a potential of 30 trillion cubic feet of lean gas in place, according to drilling and seismic data.
- The Zohr structure is located in sea depth of about 1500 metres.
- The Zohr 1 NFW well was drilled to a total depth of 4,131 metres and encountered a 630-meter hydrocarbon column in a Miocene-aged carbonate sequence with good reservoir characteristics (430 metres plus of net pay).
- In January 2018, production at the Mediterranean port of Zohr reached to 2 billion cubic feet per day (bcfd).
- The hardships that exist in the pre-Messinian sequence, including the high pressure, the poor seismic imaging and the absence of direct hydrocarbon indicators (Dolson et al.2002).
Fig.7 Zohr play Concept (after Cozzi.et.al.2018)
The Nooros field
The Nooros field was discovered in the Nile Delta offshore area in July 2015 and put into production the following month in record time. It is currently Eni's most important gas-producing field in Egypt.The find fully demonstrates Eni's "near field" exploration strategy.
Nooros Gas Field
Practical work
Well name: AbuMadi_X
Location: onshore
Pay Zone: 3288-3321m (33m)
Belongs to Abu Madi Fm.
Fig.8 Petrophysical data with interpretation for zone A between depths 3279 and 3321 m in AbuMadi-X Well representing the highly promising characteristics for gas production
v
At depth 3288 m
Fig. 9 Petrophysical data interpretation at depth 3288m located at zone A in AbuMadi-X Well
Pickett plot
Fig.10 Pickett plot for zone A in AbuMadi-X Well