摘要
基于柳林地区煤储层试井资料,采用地质统计分析等方法,探讨了柳林地区煤储层试井渗透性展布规律,阐明了煤储层埋深和地应力对其渗透率的控制机制。研究表明:柳林地区煤层渗透率介于(0.03~1.43)×10^(-3)μm^2,平均值为:0.2821×10^(-3)μm^2;主要以中渗透率煤层(0.1×10^(-3)μm^2~1×10^(-3)μm^2)和低渗透率煤层(<0.1×10^(-3)μm^2)为主。煤储层试井渗透率随着埋藏深度的增大而呈负幂指数规律减小,浅部的煤储层渗透率相对较高,且变化范围较大,埋藏深度的增加,煤储层渗透率降低,且变化范围较小。现今地应力与煤储层渗透率的相关性较高,当最小水平主应力大于10 MPa时,试井煤层的渗透率普遍小于0.5×10^(-3)μm^2,当最大水平主应力大于15 MPa时,试井煤层的渗透率普遍小于0.5×10^(-3)μm^2,煤储层渗透性表现为沿最大水平主应力方向。
Based on geological analysis of date in Liulin area, the spatial distribution of coal reservoirpermeability and characteristics of in-situ stress in Liulin area are discussed, and the control mechanismof buried depth and for coal reservoir permeability is obtained in this study. It is showed that the coalreservoir permeability in in Liulin area is between(0.03~1.43)×10-3 μm2,and the average is 0.2821×10-3μm2;the primary class of coal reservoir permeability is medium(0.1×10-3 μm2~1×10-3 μm2)and low(<0.1×10-3 μm2). With the increase of buried depth, the coal reservoir permeability decreases by a law ofnegative power exponent way; the shallow coal reservoir permeability is relatively high, and variesgreatly; with the increase of buried depth, coal reservoir permeability will decreases, and varies smally.The relationship of in-situ stress and coal reservoir permeability is close; when the minimum horizontalprincipal stress is rather than 10 Mpa, the coal reservoir permeability is generally less than 0.5×10- 3μm2; when the maximum horizontal principal stress is rather than 15Mpa, the coal reservoir permeabilitytest is generally less than 0.5×10-3 μm2; along the direction of maximum horizontal principal stress, coalreservoir permeability is larger.
作者
任鹏飞
汤达祯
许浩
李松
喻廷旭
Ren Pengfei;Tang Dazhen;Xu Hao;Li Song;Yu Tingxu(School of Energy Resources,Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences (Beijing),Beijing 100083,China;School of Energy Resources,Key Laboratory of Shale Gas Exploration and Evaluation,Ministry of Land and Resoueces,China University of Geosciences (Beijing),Beijing 100083,China;Geological Engineering Investigation and Design Research Institute,Sichuan Provincial Coalfield Bureau,Chengdu 610072,China)
出处
《科技通报》
北大核心
2016年第7期25-29,42,共6页
Bulletin of Science and Technology
基金
大型油气田及煤层气开发国家科技重大专项课题(2011ZX05038-002)
关键词
柳林地区
煤储层
埋深
地应力
渗透率
控制机理
Liulin area
coal reservoir
buried depth
in-situ stress
permeability
control mechanism
