摘要
延安气田属于致密砂岩气藏,孔隙结构复杂。借助室内物理模拟实验,研究不同层位致密砂岩渗流机理及其影响因素。实验结果表明,当克氏渗透率大于0.1 mD时,鄂尔多斯盆地上古生界致密砂岩中不存在启动压力梯度;当克氏渗透率小于0.1 mD时,存在启动压力梯度,其中山1层启动压力梯度最大,其次为盒8层和山2层,本溪组启动压力梯度最小。对启动压力梯度的两个影响因素渗透率与含水饱和度进行敏感性分析显示启动压力梯度分别与两者呈现幂函数关系,随渗透率的增大而减小,随含水饱和度的增大而增大。
Yan'an gas field is a typical tight sandstone gas reservoir,which pore structure is complicated.The seepage mechanism and its influencing factors of tight sandstone in different formations can be studied by indoor physical simulation experiment.Experimental results show that there is no actuating pressure gradient in tight sandstone gas reservoir when the klinkenberg permeability is greater than 0.1 mD.When it is less than 0.1 mD,there is an actuating pressure gradient.The actuating pressure gradient of S1 formation is the largest,followed by H8 and S2 formations.The starting pressure gradient of Benxi formation is the smallest.Sensitivity analysis shows that two factors affecting the actuating pressure gradient are permeability and water saturation.The actuating pressure gradient presents separately power function relationship with the two.It decreases with increasing permeability,and increases with the increase of water saturation.
作者
白慧芳
施里宇
张磊
辛翠平
王永科
王少征
Bai Huifang;Shi Liyu;Zhang Lei;Xin Cuiping;Wang Yongke;Wang Shaozheng(Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710065, China;Chengde Petroleum College, Chengde, Hebei 067000, China)
出处
《非常规油气》
2020年第3期60-64,54,共6页
Unconventional Oil & Gas
基金
陕西省重点科技创新团队项目“延长石油集团天然气勘探开发创新团队”(2015KCT-17)资助。
关键词
鄂尔多斯盆地
延安气田
渗流实验
启动压力梯度
敏感性分析
Ordos Basin
Yan'an gas field
seepage experiment
actuating pressure gradient
sensitivity analysis
