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 1 Comparison of chemical composition of Permian basalts in different areas.

Area Chemical composition of basalt/% SiO2 Na2O+K2O Range Average Range Average Well YT1 35.44-52.84 43.08 2.27-8.36 5.91 Kangdian area 46.40-50.79 48.44 1.25-5.32 4.04 World 49.20 4.01 Continental rift valley (alkaline basalt) 47.80 4.16