油气藏评价与开发 ›› 2023, Vol. 13 ›› Issue (1): 64-73.doi: 10.13809/j.cnki.cn32-1825/te.2023.01.007
收稿日期:
2021-10-22
发布日期:
2023-01-30
出版日期:
2023-02-26
通讯作者:
李茂茂
E-mail:yingingli@163.com;limaomao819@163.com
作者简介:
李颖(1991—),女,工学博士(后),副研究员。主要从事油气藏开采、CO2地质封存理论与技术方面的研究。地址:四川省成都市新都区新都大道8号西南石油大学,邮政编码:610500。E-mail:基金资助:
LI Ying(),LI Maomao(),LI Haitao,YU Hao,ZHANG Qihui,LUO Hongwen
Received:
2021-10-22
Online:
2023-01-30
Published:
2023-02-26
Contact:
LI Maomao
E-mail:yingingli@163.com;limaomao819@163.com
摘要:
页岩气藏储层发育微纳米孔喉和裂缝,黏土矿物含量高,岩石渗透率低且非均质性较强,通常需要经过大规模水力压裂才能被有效开采。水力压裂过程中水相的自发渗吸将对页岩气藏储层产生一系列物化作用,改变页岩气藏储层的孔隙结构及物化性质,从而影响页岩气的产出。为进一步明确水相渗吸对页岩气藏储层的影响机理,开展了页岩重复渗吸对照实验,并基于页岩渗吸前后矿物溶蚀导致的质量变化、扫描电镜可视化特征、核磁共振孔隙结构观测以及物性的变化,揭示渗吸对页岩微观孔隙结构及其物性的影响机理。研究结果表明:①水相渗吸作用使页岩产生微裂缝和裂缝,从而改变页岩孔隙结构;②孔隙度明显改善的页岩样品中,大孔所占比例上升,表明水相渗吸作用会使页岩孔隙空间增大;③渗吸能力与页岩的孔隙度、渗透率呈正相关,且页岩物性在渗吸后改善明显。此外,发现时间指数可定量表征渗吸对页岩孔喉连通性的影响。
中图分类号:
Ying LI,Maomao LI,Haitao LI, et al. Physicochemical mechanism of water phase imbibition in shale reservoirs[J]. Reservoir Evaluation and Development, 2023, 13(1): 64-73.
表1
第一组实验样品基本参数"
样品 | 编号 | 长度(cm) | 直径(cm) | 边界条件 |
---|---|---|---|---|
CN1区块 | CN1-1-1 | 1.01 | 2.53 | TEO |
CN1-1-2 | 1.01 | 2.53 | 重复渗吸 | |
CN1-2 | 3.04 | 2.54 | TEO | |
CN2区块 | CN2-1-1 | 1.00 | 2.53 | TEO |
CN2-1-2 | 1.00 | 2.53 | 重复渗吸 | |
CN2-2 | 1.93 | 2.53 | TEO | |
YN区块 | YN-1-1 | 0.84 | 2.51 | TEO |
YN-1-2 | 0.84 | 2.51 | 重复渗吸 | |
YN-2 | 1.78 | 2.53 | TEO | |
CQ区块 | CQ-1-1 | 0.84 | 2.54 | TEO |
CQ-1-2 | 0.84 | 2.54 | 重复渗吸 | |
CQ-2 | 1.92 | 2.55 | TEO | |
CQ-3 | 2.88 | 2.55 | TEO | |
致密砂岩 | S-1 | 3.35 | 2.52 | TEO |
S-1-2 | 3.35 | 2.52 | 重复渗吸 | |
S-2 | 4.91 | 2.52 | TEO |
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