Table 2 The petrophysical and reservoir quality parameters and their ranks derived from the core data of the Qawasim Formation in wells (WD-2, WD-3, and WD-7), West Dikirnis Oil Field, Nile Delta of Egypt.

From: Implication of the micro- and lithofacies types on the quality of a gas-bearing deltaic reservoir in the Nile Delta, Egypt

RRTs

Depositional environment

Microfacies

 

DRT

ρb

ρg

∅He

∅FS

kV

kH

λk

Sw

So

Sg

RQI

FZI

RPI

Reservoir

(g/cc)

(g/cc)

%

%

md

md

%

%

%

µm

µm

rank

ranks

RRT1 (N = 138)

Prodelta and distal delta front

Sublithic arenite

Min

15.0

1.760

2.609

17.1

15.8

767.6

1600

0.87

27.90

0.00

28.99

3.04

8.88

3.0

Good

Max

16.0

2.196

2.680

33.6

36.3

9949

10,011

1.57

62.20

20.0

70.10

5.66

15.00

2.0

Very good

Mean

15.5

1.882

2.639

28.6

25.5

5609

6592

1.10

43.85

7.20

48.95

4.71

11.75

2.0

Very good

RRT2 (N = 95)

Prodelta and distal delta front

Subarkose arenite—Sublithic arenite

Min

13.9

1.670

2.610

15.8

9.5

150

440

0.86

25.17

0.00

28.70

1.66

5.13

3.0

Good

Max

15.5

2.240

2.710

36.2

36.0

5565

5732

2.33

70.40

15.30

68.00

4.24

11.30

2.0

Very good

Mean

14.6

1.880

2.647

29.0

24.9

1854

2686

1.28

46.06

5.48

48.47

2.92

7.38

3.0

Good

RRT3 (N = 114)

Proximal delta-front & delta plain

Subarkose arenite—Glauconitic quartz wacke

Min

12.1

1.779

2.600

15.4

12.3

32.4

80.6

0.82

28.40

0.00

2.90

0.65

2.14

5.0

Poor

Max

15.1

2.267

2.710

32.5

31.5

1356

1666

2.28

85.40

19.0

69.10

2.50

9.56

3.0

Good

Mean

13.5

1.903

2.652

28.2

23.6

443.7

708.1

1.34

49.64

5.01

45.35

1.57

4.45

4.0

Fair

RRT4 (N = 30)

Proximal delta-front & delta plain

Glauconitic quartz wacke

Min

11.4

1.830

2.642

22.6

11.3

5.70

43.90

1.69

30.40

0.00

28.76

0.44

1.50

5.0

Poor

Max

13.5

2.098

2.710

30.8

32.7

221

1133

4.75

71.24

9.70

68.40

1.90

4.27

3.0

Good

Mean

12.6

1.944

2.667

27.1

21.2

46.9

375.2

3.18

46.69

1.67

51.65

1.09

2.87

4.0

Fair

RRT5 (N = 58)

Proximal delta-front & delta plain

Sandy mudstone/Siltstone

Min

7.2

1.935

2.638

6.5

10.3

0.030

0.085

0.88

29.81

0.00

13.30

0.04

0.18

6.0

Tight

Max

12.0

2.534

2.720

27.5

31.0

38.9

40.8

4.85

86.70

7.20

69.20

0.38

2.01

5.0

Poor

Mean

9.1

2.190

2.666

17.8

19.0

3.31

7.75

1.57

61.81

0.74

38.35

0.14

0.56

6.0

Tight

  1. where RRTs are the reservoir rock types; N is the number of available samples; DRT is the discret rock type; ρb & ρg are the bulk and grain densities, respectively; ∅He & ∅FS are the helium and fluid summation porosity, respectively; kV and kH are the vertical and horizontal gas permeability; λk is the permeability naisotorpy; SW, So and Sg are the water, oil and gas saturations, RQI and FZI are the reservoir qulaity index and the flow zone indicator, respectively; and RPI rank, is the reservoir ponteility index. The RPI ranks are based on the classification ranks of the reservoir quality parameters (Nabawy32,48; Nabawy et al.41; Elgendy et al.50).
Back to article page