中国陆相页岩气的形成条件

虽然目前北美工业性开发的页岩气资源均在海相沉积地层中，但我国已在陆相泥页岩中获得了页岩气勘探开发的重要突破，陆相页岩气的资源潜力也正随着勘探实践的深入而被逐步揭示。为此，在研究我国陆相富有机质泥页岩分布特点的基础上，分析了主要盆地陆相富有机质泥页岩的基本地质条件和有机地球化学参数。结果认为，我国形成陆相页岩气富集具有6个方面的有利条件：累计厚度大、有机质类型多样、储集空间丰富、保存条件好、资源丰度高、地表条件好。结论指出：我国陆相富有机质泥页岩主要分布在华北及东北区、西北区及南方局部地区的中-新生界，形成陆相页岩气富集主要具有上述有利条件，而且我国陆相富有机质泥页岩发育区多与常规油气勘探开发成熟区重叠，具有资料和基础设施等方面的优势，因此具有更好的经济可采性；虽然我国陆相富有机质泥页岩具有相对较低的有机质热演化成熟度，目前多处于生油和湿气窗阶段，页岩气和页岩油在微观和宏观上呈共生伴生关系，但通过异同点对比分析后认为，我国陆相页岩气比页岩油具有更好的可采潜力。

Conditions of continental shale gas accumulation in China

Industrial production of shales in North America has been achieved most often in those marine sedimentary beds, while in China great breakthrough has been made in continental shales, the great potential of which has been gradually unveiled with the deepening of exploration practices. In view of this, this paper first analyzes the distribution features of the continental organic matter rich shales in China, and then makes a deep investigation into the basic geological condition and organic geochemical parameters. This study shows that there are good advantages for continental shale gas accumulation in China: huge cumulative thickness of shale reservoirs, various types of organic matters, rich reservoir space, favorable preservation condition, great resource abundance, and satisfactory ground condition. In conclusion, rich continental organic matter rich shales are mainly distributed in the Mes Cenozoic strata in North China, Northeast China, Northwest and some parts of South China, where there are mature conventional oil and gas fields with enough data available and the ready made infrastructures. From this aspect, the recovery and production of continental shale gas resources in China is cost effective. Although the organic matter of continental organic rich shales in China has a relatively low thermal degree of maturity, and shale gas and shale oil are symbiotic both in micro and macro, through the comparative analysis of the similarities and differences between shale oil and shale gas, the economic recoverable potential of continental shale gas is greater than that of shale oil.