Reservoir Evaluation and Development ›› 2021, Vol. 11 ›› Issue (2): 154-163.doi: 10.13809/j.cnki.cn32-1825/te.2021.02.003
• Shale Gas Exploration • Previous Articles Next Articles
XIONG Liang1(),PANG Heqing1(),ZHAO Yong1,WEI Limin1,ZHOU Hua1,CAO Qian2
Received:
2020-10-20
Online:
2021-04-26
Published:
2021-04-30
Contact:
PANG Heqing
E-mail:xiongliang.xnyq@sinopec.com;phq450303@qq.com
CLC Number:
XIONG Liang,PANG Heqing,ZHAO Yong,WEI Limin,ZHOU Hua,CAO Qian. Micro pore structure characterization and classification evaluation of reservoirs in Weirong Deep Shale Gas Field[J].Reservoir Evaluation and Development, 2021, 11(2): 154-163.
Table 1
Main pore types and parameters in Weirong Shale Gas Field"
孔隙类型 | 赋存 环境 | 扫描电镜典型照片 | AmicSCAN矿物分析电镜 典型照片 | 孔隙半径(μm) | 形状系数 | 伸长率(%) | 分形维数 | 有机孔 占比(%) | 面孔占比(%) |
---|---|---|---|---|---|---|---|---|---|
有 机 孔 | 有机质中 | A5井,3 570.7 m | A5井,3 570.7 m | 0.01~0.20 | 0.50~0.90 | ≤5 | 2.72~2.92 | ≥50 | 55~65 |
粒 间 孔 | 黏土 矿物间 | A5井,3 570.7 m | A5井,3 570.7 m | >0.10 | 0.60~0.70 | >5 | 2.30~2.90 | 40~50 | 25~30 |
粒 内 孔 | 方解石、石英、 长石中 | A5井,3 570.7 m | A5井,3 570.7 m | 0.01~0.70 | 0.70~0.87 | <3 | 2.22~2.45 | 40~50 | 10~15 |
微 裂 缝 | 硅质纹层、碳酸盐岩纹层中发育 | A5井,3 570.7 m | A5井,3 570.7 m |
Table 2
Statistics of pore structure distribution based on SEM"
孔隙结 构类型 | 孔隙半径频率分布曲线形态 | 主要分布小层及岩性 | 有机孔 占比(%) | 孔隙半径(μm) | 孔隙度(%) | TOC (%) | 形状分布 |
---|---|---|---|---|---|---|---|
单 峰 型 | 2小层,钙质-黏土质-硅质 混合型页岩 | ≥50 | 0.01~0.20 | 4.1~6.9 | ≥4 | ||
双 峰 型 | 33、4小层, 硅质-钙质- 黏土质页岩 | 40~50 | 0.05~10.00 | 5.1~6.4 | 2~3 | ||
单 斜 型 | 31小层,生物 硅质页岩 | ≥50 | 0.05~0.20 | 5.1~7.4 | ≥4 | ||
⑤—⑨号层, 黏土质页岩 | <25 | <0.05 | 4.2~5.0 | <2 |
Table 3
Classification of pore structure parameters of shale reservoir in Weirong Gas Field"
孔隙结构分类 | TOC(%) | 有机孔 占比(%) | 渗透率 (mD) | 储能评价参数(10-4 mD) | 中值半径(nm) | 分选 系数 | 变异 系数 | 孔隙类型 | 孔隙半径 分布形态 |
---|---|---|---|---|---|---|---|---|---|
Ⅰ类 | ≥4 | ≥50 | ≥0.120 | ≥85 | ≤41.5 | ≥0.7 | ≥1.1 | 有机孔发育,无机孔相对发育, 孔隙连通性好,微裂缝发育 | 多模态 宽广型 |
Ⅱ类 | 3~4 | 40~50 | 0.040~0.120 | 15~85 | 41.5~43.0 | 0.6~0.7 | 0.9~1.1 | 有机孔相对发育,见部分无机孔、 微裂缝 | 双模态 宽广型 |
Ⅲ类 | 2~3 | 25~40 | 0.015~0.040 | 5~15 | 43.0~44.5 | 0.5~0.6 | 0.7~0.9 | 有机孔较发育,无机孔相对发育, 存在一定量微裂缝 | 双模态高低不对称型 |
Ⅳ类 | <2 | <25 | <0.015 | <5 | >44.5 | <0.5 | <0.7 | 无机孔较发育,少量有机孔 | 单模态 集中型 |
Table 4
Classification and evaluation criteria of Weirong deep shale gas reservoir"
储层 类别 | 地质参数 | 工程参数 | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
TOC (%) | 孔隙度(%) | 总含气量(m3/t) | 孔隙结 构类型 | 脆性矿物 含量(%) | 黏土矿物 含量(%) | 杨氏模量 (GPa) | 泊松比 | 层理及 微裂缝 | ||
Ⅰ类 | ≥4 | ≥6 | ≥6 | Ⅰ类 | ≥50 | ≤35 | ≥36 | ≤0.225 | 极发育 | |
Ⅱ类 | 3~4 | 5~6 | 4~6 | Ⅱ类 | 42~50 | 35~45 | 32~36 | 0.225~0.250 | 发育 | |
Ⅲ类 | 2~3 | 3~5 | 2~4 | Ⅲ类 | 35~42 | 45~55 | 28~32 | 0.250~0.280 | 较发育 | |
Ⅳ类 | <2 | <3 | <2 | Ⅳ类 | <35 | >55 | <28 | >0.280 | 一般 |
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