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Distribution and gas-bearing properties of Permian igneous rocks in Sichuan Basin, SW China
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MA Xinhua,LI Guohui,YING Danlin,ZHAGN Benjian,LI Ya,DAI Xin,FAN Yi,ZENG Yunxian
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Table 4 Comparison of igneous rock reservoir forming conditions in Sichuan Basin.
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| Area | Horizon | Main source rock formation | Reservoir | Trap
type | Main reservoir forming period | Rock
type | Hydrocarbon-generation intensity/(108 m3/km2) | Rock type | Type | Thick-
ness/m | Average
porosity/% | | Southwest Sichuan | Middle Permian | Limestone | 10-22 | Basalt | Pore-fissure
type | 0-32.1 | 1.39 | Tectonic | Yanshan Period | Jianyang-
Santai area | Cambrian Qiong-
zhusi Formation | Shale | 80-100 | Pyroclastic rock | Fissure-pore type | 100.3 | 13.76 | Tectonic-
lithologic | Yanshan Period |
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