石油实验地质2018，Vol.40Issue(1)：126-132,7.DOI:10.11781/sysydz201801126
页岩气保存机制探讨
Preservation mechanism of Fuling shale gas
摘要
Abstract
The essential difference between conventional gas and shale gas in reservoir space is the difference in pore size or pore structure. The shale burial history, gas content, production data and isotope fractionation of desorbed gas in the Jiaoshiba area of Fuling, Sichuan Province indicate that shale gas was stored in the inter-connected pore units formed by single or multiple organic matter types, and its preservation mechanism was attributed to capillary pressure and static water pressure. Therefore, tectonic structure or trap shape has little impact on shale gas enrichment. The destruction of shale gas preservation conditions by tectonic activity was mainly determined by the decrease of static water pressure caused by tectonic movements, the destruction of lamination caused by geologic stress, and the decrease of capillary sealing ability caused by the opening of lamellae under horizontal compression conditions. Faults releasing tectonic force would not cause further destruction of lamination. On the contrary, they might be helpful for the preservation of a footwall which could be the optimum shale gas target. The recovery ratio of shale gas could be derived from the theory of capillary pressure, which would supply guidance for production.关键词
含气量/毛管压力/超压/保存条件/页岩气/焦石坝地区/四川盆地Key words
gas content/capillary pressure/overpressure/preservation conditions/shale gas/Jiaoshiba area/Sichuan Basin分类
能源科技引用本文复制引用
范明,俞凌杰,徐二社,杨振恒,张文涛,刘伟新..页岩气保存机制探讨[J].石油实验地质,2018,40(1):126-132,7.基金项目
国家重点基础研究发展计划(973计划)项目"下古生界油气封盖机理与盖层有效性评价"(2012CB214803)资助. （973计划）
