项目名称: 富有机质页岩波速各向异性的实验研究
项目编号: No.41304141
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 王小琼
作者单位: 中国石油大学(北京)
项目金额: 25万元
中文摘要: 波速及其各向异性对于深部页岩气探测与储层评价具有重要意义。页岩气储层属于富有机质页岩。因其富含有机质,且矿物成分定向排列和天然裂隙发育,因而具有强各向异性。作为重要影响因素之一的有机质的类型、丰度、热成熟度、有机孔隙度等变化大,因而弹性性质差异大,不易测量,难以表征。至今实验室内对有机质的研究还偏少,且有机质对波速各向异性的影响还不太清楚。为此本研究将采用高精度的三轴压机和波速监测系统,在实验室内开展页岩岩心波速各向异性的精细测试,并采用有效介质理论,研究页岩气储层中有机质的弹性性质、有机质对波速及其各向异性的影响,并建立富有机质页岩的各向异性速度模型,为页岩气勘探与高效开发提供理论基础。
中文关键词: 页岩储层;各向异性;波速;天然裂隙;实验研究
英文摘要: Velocity measurements and anisotropy are significant for the exploration of deep shale gas and reservoir assessment. Shale gas play is rich in organic. It is strongly anisotropic due to total organic carbonate (TOC) content,clay-preferred orientation and naturally aligned cracks. The elastic properties of TOC vary significantly as the types,contents,thermal maturity and porosity of TOC change in different shales.Until now the measurements of TOC are scarce and the influence of TOC on anisotropy are unclear. Thus,in order to investigate the effcts of microstructure on macroscopic anisotropy,wave velocity measurements will be conducted in the laboratory with advanced instruments and methods.Then with effective medium model,the elastic properties of TOC, the effects of TOC on wave velocity and anisotropy will be investigated. That is to establish the velocity model of shale based on the TOC and to better understand the petrophysical properties of shales.
英文关键词: shale gas play;anisotropy;wave velocity;natural cracks;experimental study