摘要
低渗透砂岩有水气藏改建地下储气库具有特殊性和复杂性,为了指导同类型气藏开展建库可行性评价,以四川盆地中坝气田上三叠统须家河组须二段气藏为研究对象,在明确建库地质条件可行性的基础上,开展了气藏水侵现状、水体规模等动态特征研究,并基于岩心相渗实验及气藏数值模拟等手段分析了气藏建库可行性及有效库容空间,指出了低渗透砂岩有水气藏改建储气库的可行性评价方法。研究结果表明:①区域断层及顶底板封闭性良好;②建库区储层含气空间动用率仍可保持在较高水平;③气藏整体呈弱—中水驱,边底水处于不活跃—次活跃状态,对主体建库区影响较小;④结合静动态特征认识,主体构造内纯气区与气水过渡区可作为建库可动区域。结论认为:①中坝气田须二段气藏具备改建地下储气库的可行性;②在原始地层压力27.25 MPa下建库区域有效库容空间为106.80×10^(8)m^(3)。
It is rather unusual and complex for underground gas storages(UGSs)rebuilt from low-permeability gas reservoirs with water.To provide guidance for feasibility evaluation on the rebuilding from similar reservoirs,the second member of Xujiahe Formation(Xujiahe 2 Member),Zhongba gasfield,Sichuan Basin,was taken as an objective to clarify its geological feasibility in UGS construction.And then,some dynamic characteristics were summed up,such as water invasion and waterbody scale.Thirdly,by means of relative-permeability experiments on cores and numerical simulation,both rebuilding feasibility and effective storage capacity were discussed.Finally,one method was created for this feasibility evaluation.Results show that(i)regional faults and roof or floor enjoy better sealing capacity;(ii)the mobilization ratio of reservoir space is still able to maintain at a higher level;(iii)all the gas reservoirs represent weak to medium water driving with edge and bottom water in subactive to inactive state,which exerts less influence on the main UGS site;and(iv)static and dynamic characteristics suggest that both pure gas area and gas-water transitional area in the main structure are available for UGS construction.In conclusion,rebuilding one UGS in Zhongba gasfield from Xujiahe 2 gas reservoirs is feasible.What's more,the effective storage capacity is 106.80×10^(8)m^(3)under the original formation pressure of 27.25 MPa.
作者
李开发
张楚越
朱亮
袁港
罗静
李旭成
LI Kaifa;ZHANG Chuyue;ZHU Liang;YUAN Gang;LUO Jing;LI Xucheng(Northwestern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Jiangyou,Sichuan 621741,China)
出处
《天然气技术与经济》
2024年第1期32-38,共7页
Natural Gas Technology and Economy
关键词
四川盆地
低渗透
有水气藏
储气库
中坝气田
库容
Sichuan Basin
Low permeability,Gas reservoir with water
Underground gas storage
Zhongba gasfield
Storage capacity
