Table 3
Table of resistivity data as a function of coal rank and TOC values for different coal types: Resistivity data as a function of coal rank and TOC values for different coal types. The resistivity values for bituminous coal (Max and Min) (Telford et al., 1990), while the resistivity values for sub-bituminous coal B and medium- and high-volatile bituminous coal (C, B and A) were derived from the reference data study of McCabe and Tholey. (1945). TOC values for each coal type were based on the Passey equation and Rock Eval TOC values as reported by Mastalerz et al. (2011).
| Rank | Resistivity (ohm.m) |
Delta log R | Passey TOC (wt%) |
Expected TOC (wt%) | |||
|---|---|---|---|---|---|---|---|
| Dry | Wet 1 | Dry | Wet 1 | Dry | Wet 1 | – | |
| Sub-bituminous B Coal | 3.106 | 5100 | 6 | 3.23 | 19.32 | 10.40 | 80 |
| High volatile C bituminous Coal (1) | 3.106 | 2740 | 6 | 2.96 | 19.32 | 9.53 | 80 |
| High volatile C bituminous Coal (2) | 3.106 | 4150 | 6 | 3.14 | 19.32 | 10.11 | 80 |
| High volatile B bituminous Coal | 3.106 | ND | 6 | ND | 19.32 | ND | 86 |
| High volatile A bituminous Coal | 3.106 | 1480 | 6 | 2.69 | 19.32 | 8.67 | 86 |
| Medium volatile bituminous Coal | 3.106 | 220 | 6 | 1.87 | 19.32 | 6 | 90 |
| Bituminous Coal (Max) | 105 | ND | 4.52 | ND | 14.56 | ND | 89 |
| Bituminous Coal (Min) | 6.104 | ND | 4.30 | ND | 13.85 | ND | 89 |
1The wet coal samples were impregnated in water for 24 h before being subjected to resistivity measurement after McCabe and Tholey. (1945)
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