Silurian Longmaxi Shale Gas Potential Analysis in Middle & Upper Yangtze Region
Silurian Longmaxi Shale Gas Potential Analysis in Middle & Upper Yangtze Region
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作者：
M. Key
扬子地区志留系以泥页岩沉积为主。龙马溪组下段发育有机质丰富的泥页岩。它是在鲁达尼亚海平面迅速上升时沉积下来的。受古台地地形的影响，厚层富烃泥页岩主要分布在川东、鄂西和湘北地区。龙马溪泥页岩以含碳粉砂质页岩为主，分布稳定。四川石柱地区总有机碳值（TOC）超过6.5%，总厚度（TOC1.0%）约为105m。有机质类型以ⅰ、ⅱ型为主，热成熟度高。该地区页岩气勘探潜力巨大。
Mud shale deposition takes the majority of Silurian in Yangtze Region. Mud shale of rich organic matter presents in Lower Longmaxi Formation. It was deposited as sea level rose rapidly in the Rhuddanian. Influenced by ancient terrain of platform, thick hydrocarbon-rich mud shale is mainly distributed in eastern Sichuan, western Hubei and northern Hunan. Longmaxi mud shale is mainly sandy shale containing carbon powder that is distributed stably. Measured total organic carbon values (TOC) exceed 6.5% and total thickness (TOC1.0%) approximate 105m in Shizhu area of Sichuan. The organic matter type is mainly I or II types and has highly thermal maturity. The potential of exploration for shale gas is great in the region.