摘要
以中国致密砂岩气未来潜力区塔里木盆地库车坳陷为研究区,通过显微镜下观测、毛细管压力曲线测试、孔渗测试和天然气运移物理模拟实验,研究致密砂岩储层孔隙结构及天然气在致密储层中的充注运移特征.结果表明,1)研究区致密砂岩储层孔隙结构以溶蚀孔与槽型孔为主,孔隙半径主要在0.1μm左右;2)致密砂岩储层的渗透率与孔隙度没有明显的相关性,渗透率主要受孔隙结构与裂缝发育控制;3)天然气在致密砂岩储层中运移需要一定的启动压力梯度,渗透率越高,需要的启动压力梯度越小;4)岩石中裂缝发育会显著降低启动压力梯度;5)致密砂岩中天然气的运移过程可分为3个阶段,即单个气泡游离聚集-形成连续相-连续相运移.
This study focuses on the pore structure and gas migration in tight sandstone reservoir in Kuqa depression of Tarim basin, based on microscopic observation and laboratory experiments. Results indicate that main pore types of tight sandstone in the study area are disslolved pores and slot pores, and the pore-throat radiuses are about 0. 1 μm; there is no obvious correlation between permeability and porosity; gas migration in tight sandstone requires a certain starting pressure gradient; and the process of gas migration and accumulation in tight sandstone can be divided into the following three stages： accumulation of gas bubbles, formation of continuous state gas, and migration of the continuous state gas through pore system.
出处
《中国科学院大学学报（中英文）》
CAS
CSCD
北大核心
2014年第1期108-116,共9页
Journal of University of Chinese Academy of Sciences
基金
国家油气重大专项(2011ZX05003-001)
中国石油天然气集团股份公司重大科技项目(2011-0203A)
中国石油科技开发项目(2011B0403)资助
关键词
致密砂岩
运移
孔隙结构
库车坳陷
tight sandstone
migration
pore structure
Kuqa depression
