Distribution and gas-bearing properties of Permian igneous rocks in Sichuan Basin, SW China
MA Xinhua,LI Guohui,YING Danlin,ZHAGN Benjian,LI Ya,DAI Xin,FAN Yi,ZENG Yunxian
Table 2
Statistics of porosity of Permian basalts in Southwest Sichuan.
Rock type
Porosity/%
Number of samples
Range
Average
Vesicular basalt
3.19-9.40
5.41
13
Almond basalt
0.23-9.97
1.89
123
Porphyry basalt
2.53-6.14
3.34
3
Microcrystalline-cryptocrystalline basalt
0.09-5.76
0.85
219
Total
0.09-9.97
1.39
358