Assessment of Mineralogical and Geochemical Composition of Oligocene/Eocene Black Shale Deposits in Beni Suef Area, Egypt

Table 2

TOC and TS and Rock-Eval pyrolysis of the shales from Dabaa and El Fashn formations.

Location

Formation Name

Sample No.

TOC

TS

Rock-Eval pyrolysis results

S1

S2

S3

Tmax

HI

OI

PI

PY

(wt %)

(mg/g)

(°C)

(mg/g)

(mg/g)

Maydoum quarry

Dabaa fm. (black shale)

D1a

0.31

0.4

N

N

N

N

N

N

N

N

D1b

0.33

0.46

N

N

N

N

N

N

N

N

D1c

0.36

0.58

N

N

N

N

N

N

N

N

D2a

0.31

0.34

N

N

N

N

N

N

N

N

D2b

0.23

0.14

N

N

N

N

N

N

N

N

D3a

0.32

0.43

N

N

N

N

N

N

N

N

D3b

0.31

0.20

N

N

N

N

N

N

N

N

D3c

0.35

0.51

N

N

N

N

N

N

N

N

D4

0.13

0.01

N

N

N

N

N

N

N

N

D5

0.33

0.32

N

N

N

N

N

N

N

N

Ghaida Al-Sharqia quarry

El Fashn Fm. (black shale)

E0a

0.82

0.29

0.07

0.21

1.22

421

26

149

0.25

0.28

E0b

0.94

0.27

0.03

0.21

1.62

428

22

173

0.13

0.24

E0c

0.99

0.30

0.10

0.29

1.02

430

29

103

0.26

0.39

E0d

1.30

0.29

0.07

0.23

1.37

428

18

105

0.23

0.3

E1a

0.87

0.07

0.11

0.25

1.56

425

29

180

0.31

0.36

E1b

2.27

1.52

0.20

1.03

2.90

427

45

128

0.16

1.23

E1C

0.83

0.06

0.03

0.19

1.25

427

23

151

0.14

0.22

E2a

0.15

0.04

N

N

N

N

N

N

N

N

E2b

0.13

0.11

N

N

N

N

N

N

N

N

E3a

0.12

0.03

N

N

N

N

N

N

N

N

E4

0.18

0.06

N

N

N

N

N

N

N

N

E5

0.10

0.05

N

N

N

N

N

N

N

N

TOC : total organic carbon (wt%). TS : total sulfur (wt%). S1 : volatile hydrocarbons (mg HC/g rock). S2 : maximum hydrocarbons yield (mg HC/g rock). HI : hydrogen index = S2 × 100/TOC (mg HC/g TOC). OI : carbon dioxide index = S3 × 100/TOC (mg CO2/g TOC). PY : potential yield = S1 + S2 (mg/g). PI : production Index = S1/(S1 + S2). N : neglected.