Review Article
Lower Cambrian Organic-Rich Shales in Southern China: A Review of Gas-Bearing Property, Pore Structure, and Their Controlling Factors
Table 2
Gas-bearing characteristics of the Lower Cambrian shales in the southern China (see Figure
2 for well locations).
| Regions | Well | Formation | Gas content (m3/t) Range/Average | Average content of CH4 (%) | Average content of N2 (%) | References |
| Sichuan Basin | W201 | Qiongzhusi Fm. | 1.10-3.51/2.01 | 95 | nd | [96, 105, 106] | JS1 | Qiongzhusi Fm. | 1.51-2.41/1.80 | >90 | <10 | JY1 | Qiongzhusi Fm. | 1.02-4.68/2.03 |
| Western Hubei area | YY1 | Shuijingtuo Fm. | 0.58-5.48/2.05 | 90 | 8 | [98] | EYY1 | Shuijingtuo Fm. | 0.32-4.48/2.30 | >90 | <10 | YD4 | Shuijingtuo Fm. | 0.50-3.13/1.54 | ZD2 | Shuijingtuo Fm. | 0.23-4.45/2.15 |
| Chongqing area | YC1 | Niutitang Fm. | 0.03-1.12/0.22 | 16 | 84 | [97] | YY1 | Niutitang Fm. | 0.01-0.16/0.03 | 1 | 97 | CY1 | Shuijingtuo Fm. | 0-1.23/0.65 | >90 | <10 | [107] | C1 | Shuijingtuo Fm. | 0.05-3.18/1.17 | >90 | <10 | [55] |
| Northwestern Hunan area | CY1 | Niutitang Fm. | 0.03-2.10/1.02 | 9 | 72 | [21, 79] | CY-1 | Niutitang Fm. | 0.33-0.95 | 80 | 20 | [97] | HY1 | Niutitang Fm. | 0.10-0.29/0.02 | 13 | 84 | BY2 | Niutitang Fm. | 0.11-0.71 | 9 | 91 | [79] |
| Northern Guizhou area | CY1 | Niutitang Fm. | 0.30-1.80 | >95 | nd | [23, 92] | TX1 | Niutitang Fm. | 1.10-2.88 | 80 | 16 | YM1 | Niutitang Fm. | 0.10-0.40 | nd | >90 | HD1 | Niutitang Fm. | 0.09-1.31/0.42 | <30 | nd | HY1 | Niutitang Fm. | 0.32-2.00/1.50 | >85 | nd | [106, 108] | FC1 | Niutitang Fm. | 0.40-3.50 | 84 | 5 | [79] |
| Southern Anhui area | XY1 | Hetang Fm. | 0-1.30/0.94 | <0.08 | nd | [24, 109] | WY1 | Hetang Fm. | 0-0.15 | nd | nd |
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Note: “nd” means not detected; CY-1 means Ciye1 Well, while CY1 means Changye1 Well in northwestern Hunan area.
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