Table 1 Properties of the core and geochemical characteristics of the oil used in the experiment^a

Siltstone, Cadley A mine, Leics.

   Porosity

ca. 12%

   Permeability (brine)

0.01–0.02 mD

   Total carbon content

0.9%

   Total organic carbon content

0.4%

   Clay content (estimated XRD)

37%

Oil

   Saturated hydrocarbons

52.4%

   Aromatic hydrocarbons

29.4%

   Resins (NSO cmpds)

14.5%

   Asphaltenes

3.7%

Carbazole

0.9 μg g^-1

   1-Methylcarbazole

1.6 μg g^-1

   Benzo[a]carbazole

0.5 μg g^-1

   Benzo[c]carbazole

0.2 μg g^-1

   Total C₀–C₂ alkylcarbazoles

20.2 μg g^-1

   Sum C₂ alkylcarbazoles

15.4 μg g^-1

Phenol

28.3 μg g^-1

   o-Cresol

13.7 μg g^-1

   m-Cresol

3.3 μg g^-1

   p-Cresol

5.9 μg g^-1

   2-Ethylphenol

3.5 μg g^-1

   4-Ethylphenol

2.4 μg g ^-1

   2-Isopropylphenol

0.8 μg g^-1

   3-Isopropylphenol

1.0 μg g ^-1