0 引言
1 地质概况
2 样品与实验方法
3 页岩储层特征
3.1 矿物组成特征
3.2 有机质特征
表1 黔北地区五峰组—龙马溪组页岩有机质特征Table 1 Organic matter characteristics of the Wufeng-Longmaxi formations shales in northern Guizhou |
钻井 | TOC/% | R O/% | 类型 | 文献来源 |
---|---|---|---|---|
BY 1 | >2.0占39.4 | (1.82~2.23)/2.08 | I—II1 | 文献[20] |
XK1、XK2 | (2.00~7.09)/4.20 | 2.00~2.20 | I—II1 | 文献[21] |
YC1—YC3 | (0.39~9.24)/2.65 | (1.27~3.07)/2.03 | I—II1 | 文献[22] |
XY 1 | (0.97~4.95)/3.06 | (2.58~3.96)/3.31 | I—II1 | 本文数据 |
TY1 | (0.45~8.46)/3.61 | (1.83~2.75)/2.21 | I—II1 | |
DY1 | (2.0~6.0)/3.5 | (1.51~2.18)/1.79 | I—II1 | |
AY1 | (1.07~5.95)/2.65 | 2.41~3.08 | II1为主 | |
LY1 | (0.57~6.98)/1.99 | (2.37~2.53)/2.46 | I—II1 |
3.3 储层孔隙特征
图4 LY1井五峰组—龙马溪组页岩储集空间类型(a) 有机质孔发育,且连通性好,黑色页岩,深度3 007.73 m;(b)有机质孔发育,内部具有很好的连通性,黑色页岩,深度3 009.71 m;(c)草莓体黄铁矿晶间孔,黑色笔石页岩,深度3 017.4 m;(d)方解石碎屑发育溶蚀孔,黑色页岩,深度3 018.9 m;(e) 黏土矿物孔,黏土质页岩,深度2 987.83 m;(f)有机质和黄铁矿充填微裂缝,黑色页岩,深度3 017.04 m Fig.4 Reservoir space types of Wufeng-Longmaxi formations shale in Well LY1 |
4 页岩含气特征及控制因素
4.1 甲烷吸附量
图7 黔北地区五峰组—龙马溪组页岩TOC与甲烷吸附量(a)、比表面积(b)以及比表面积(c)、R O(d)与甲烷吸附量关系Fig.7 Correlations of TOC with methane adsorption content (a), specific surface area (b), and specific surface area (c) and R O(d) with methane adsorption content for the Wufeng-Longmaxi formations shales in northern Guizhou |
4.2 现场解吸气含量
图8 黔北地区AY1井五峰组—龙马溪组页岩浸水试验和解吸气点燃Fig.8 Water immersion test and inspiration ignition of the Wufeng-Longmaxi formations shales from Well AY1 in northern Guizhou |