• 责任者：Yang Qingjie (Faculty of Energy Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Hengfa
• 刊名：Petroleum Geology & Oilfield Development in Daqing
• 出版年：2013
• 卷期：32(3)
• 关键词：页岩气 ; shale gas ; 成藏模式 ; pool-formed model
• 页码：p.150-156
• 图表：illus., 1 table, 36 refs.
• 分类号：1003
• issnNo：ISSN1000-3754
• isbnNo：CN23-1286/TQ

For an in-depth understanding of shale gas generating process and nano-hydrocarbon resources, the concept of the invisible trap is pointed out through the theoretical research on the gas accumulation mechanism and hy- draulic fracturing. The trap is the most favorable enriched position for the gas and results closely from the tectonic stress, regional structural background and petrological properties. By the action of the tectonic stress, the strata of the shale and low permeability sandstone have  no significant deformation and only structural fractures are produced. The oil and gas reservoir is accumulated in the formed interconnected fractures and pores above the micro-size opening. The shale gas reservoir is generated from the action of the buoyancy on the above pores ; on the contrary, the nano pores is not connected and unable to accumulate into reservoir and is no need to fracture. There are no essential differences in the accumulating mechanism between the shale gas reservoir and conventional oil and gas reservoir. The power of the oil and gas enrichment in the reservoir pores is the buoyance generated from the density differential of the liquids.