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