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石油实验地质  2018, Vol. 40 Issue (1): 126-132    DOI: 10.11781/sysydz201801126
页岩气勘探开发 本期目录 | 过刊浏览 |
页岩气保存机制探讨
范明1,2, 俞凌杰1,2, 徐二社1,2, 杨振恒1,2, 张文涛1,2, 刘伟新1,2
1. 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126;
2. 中国石油化工集团公司 油气成藏重点实验室, 江苏 无锡 214126
Preservation mechanism of Fuling shale gas
FAN Ming1,2, YU Lingjie1,2, ZHANG Wentao1,2, LIU Weixin1,2, XU Ershe1,2, YANG Zhenheng1,2
1. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China;
2. SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China
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摘要: 常规天然气与页岩气在储集空间上的本质差别就是孔径或孔隙结构的差异。根据四川盆地涪陵焦石坝地区页岩埋藏史、含气量、生产数据及解吸气同位素分馏这4方面资料,指出页岩气是以单个或多个有机质碎片所形成的连通孔隙网络为单元被保存在页岩中,毛管压力与静水压力是页岩气孔隙压力的保存机制,因此页岩的富气程度不受构造形态或圈闭的控制。构造活动对页岩气保存条件的破坏主要决定于构造升降对静水压力破坏及地质应力对页岩页理面的破坏程度,水平挤压条件下层理面张开所引起的毛管封闭能力下降,导致页岩气散失。而断层往往是应力释放区域,使页理面不会受到进一步的破坏,相反可能对下盘起到保护作用,成为页岩气的有利勘探目标。根据毛管力原理可进一步估算页岩气的可采收率,从而为勘探开发提供指导。
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    
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.
Key wordsgas content    capillary pressure    overpressure    preservation conditions    shale gas    Jiaoshiba area    Sichuan Basin
收稿日期: 2017-10-11      出版日期: 2018-01-28
ZTFLH:  TE132.2  
基金资助: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。
作者简介: 范明(1964-),男,博士,教授级高级工程师,从事实验地质学及页岩气研究工作。E-mail:Fanming.syky@sinopec.com。
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引用本文:

刘伟新, 范明, 俞凌杰,等 .页岩气保存机制探讨[J].石油实验地质,2018,40(1):126-132.
YANG Zhenheng, FAN Ming, YU Lingjie,et al .Preservation mechanism of Fuling shale gas[J].Petroleum Geology & Experiment,2018,40(1):126-132.

链接本文:

http://www.sysydz.net/CN/10.11781/sysydz201801126      或      http://www.sysydz.net/CN/Y2018/V40/I1/126

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