摘要
北美页岩气田以海相沉积储层、热成因气为主,其页岩气的有效开发改变了全球天然气供给格局。通过十余年的勘探开发攻关,我国页岩气资源也实现了有效开发,2016年产量达到78×10~8m^3,中上扬子地区五峰-龙马溪组底部富有机质页岩是当前我国页岩气开发的主力层系。与北美相比,中上扬子地区构造条件相对复杂,页岩气储层具特殊性,在有效开发探索实践过程中仍存在多项难题亟待解决:静态储量和动态储量的匹配问题、地质和工程因素对气井产量影响的问题、现有技术对全区域页岩气开发有效性的问题、浅层常压储层页岩气开发潜力的问题以及页岩气井网加密可行性问题。针对页岩气开发评价存在的问题,提出了通过页岩储集机理研究准确评价页岩气储量,落实影响页岩气开发效果的地质和工程因素,通过地质-开发-经济一体化评价落实资源的开发有效性,加强成本管控实现浅层常压页岩气资源有效开发,开展井网加密现场试验储备页岩气田稳产接替技术等建议。
Most of the shale gas fields in the North America have marine sedimentation reservoirs and ther-mogenic gas.Their effective development of the shale gas changed the supply pattern of the natural gas in the world.Through more than ten years of exploration and development,the shale gas resources in China have been effectively developed with 78 ×108 m3 of annual output in 2016.Organic-rich shale at the bottom of Wufeng-Longmaxi Formation in the middle and upper Yangtze area is the major pay in the shale gas devel-opment in China at present.Compared with the North America,the tectonic conditions are relatively complex and the shale gas reservoirs are special in the middle and upper Yangtze area.There are many problems to be solved in the process of exploitation and exploration practice,including the matching of static reserves and dynamic reserves,the influence of geology and engineering factors on the production of the shale gas wells,the effectiveness of the existing technologies for the shale gas development in the whole region,the development potential of shallow shale reservoirs with normal pressures,and the feasibility of the shale gas well pattern infilling.Aiming at the existing issues during the evaluation of the shale gas exploitation,a series of suggestions were proposed.That is,the shale gas reserves may be evaluated accurately through the research on shale reservoir mechanism;geological and engineering factors affecting the development effect of the shale gas should be known;development effectiveness of the resources may be determined through geology-developmenteconomy integrated evaluation;the cost control should be strengthened to realize effective development of the shallow shale gas resource with normal pressure;and pilot tests of the well pattern infilling should be done for preparing the replacing technology of stable production in the shale gas field.
出处
《中外能源》
CAS
2017年第12期36-41,共6页
Sino-Global Energy
基金
国家油气科技重大专项"四川盆地及周缘页岩气形成富集条件
选区评价技术与应用"(编号:2017ZX05035)资助
关键词
页岩气
中上扬子地区
五峰-龙马溪组
开发评价
存在问题
建议
shale gas
middle and upper Yangtze area
Wufeng-Longmaxi Formation
development evaluation
issues
suggestion
