摘要
为了推进四川盆地致密气上产,以川西北部梓潼区块中侏罗统沙溪庙组一段气藏为研究对象,分析了该气藏的地质特征及主要开发特征,指出了梓潼区块沙一段气藏地质条件复杂,与邻区简阳区块沙一段、金秋区块沙二段气藏存在较大的差异,需要通过开发先导试验建立适宜的开发技术对策。研究结果表明:①梓潼区块沙一段气藏多期河道砂体纵向叠置发育,储层具有物性差、厚度小、非均质性强等特点;②气藏存在多套压力系统,并且含水饱和度高,产水可能性大。结论认为:①梓潼区块天然气勘探开发潜力较大,是下一步增储上产的重要新领域,但由于目前缺乏静动态资料,对气藏地质认识不足,因此有必要开展先导试验;②梓潼区块沙一段1、4号砂组储层大面积叠置发育,测试获工业气流,优选1、4号砂组为先导试验区目的砂组以探索两套砂组的含气性;③根据邻区开发经验,采用大夹角、水平井模式部署8口水平井,优选高效改造工艺技术,建立地质工程一体化模型,设计单井配产介于(6~9)×10^(4)m^(3)/d,预测单井累计产气量介于(1.06~1.30)×10^(8)m^(3)。
In an effort to speed up the productivity construction of tight gas in Sichuan Basin,gas reservoirs of the first member of the Middle Jurassic Shaximiao Formation(Shaximiao 1 Member)in Zitong block of northwestern basin were taken as examples to analyze geological and development characteristics.With complex geological conditions,the Shaximiao 1 reservoirs are quite different from the same reservoirs and Shaximiao 2 reservoirs individually in adjacent Jianyang and Jinqiu blocks.So,it's necessary to make available measures on development technologies through pilot tests.Results show that(i)developed with vertically superimposed multiple-episode channel sandstone,the Shaximiao 1 reservoirs in Zitong block are characterized by poor physical properties,small thickness,and strong heterogeneity;and(ii)there exist numerous pressure systems in these reservoirs with high water saturation,leading to big incidence of water production.In conclusion,Zitong block has a great prospect in natural-gas exploration and development,and will be a remarkably new domain for enlarging reserves and production in the future.Nevertheless,a shortage of static and dynamic data and inadequate understanding on reservoir geology make it essential to conduct pilot tests.What's more,there massively extended two suits of reservoirs in Zitong block,such as No.1 and No.4 sandbodies superimposed in Shaximiao 1 Member.And industrial gas flow has been received.Both sandbodies are selected as the target in pilot demonstration areas to make clear gas content in them.On top of that,learned from development experience in adjacent blocks,8 horizontal wells with big included angle have been deployed and some efficient stimulation technologies have been optimized to establish a geology-engineering integration model,among which the designed output in single well is(6–9)×10^(4)m^(3)/d,and the predicted cumulative production also in single well of(1.06–1.30)×10^(8)m^(3),respectively.
作者
罗静
舒润
谢诗意
余凯
汤潇
冉丽君
袁港
蔡林峰
杜江
LUO Jing;SHU Run;XIE Shiyi;YU Kai;TANG Xiao;RAN Lijun;YUAN Gang;CAI Linfeng;and DU Jiang(Northwestern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Jiangyou,Sichuan 621700,China;Explora-tion and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)
出处
《天然气技术与经济》
2024年第5期1-7,15,共8页
Natural Gas Technology and Economy
关键词
四川盆地西北部
梓潼区块
中侏罗统沙溪庙组一段
致密砂岩气藏
开发技术对策
Northern Sichuan Basin
Zitong block
Middle Jurassic Shaximiao 1 Member
Tight sandstone gas reservoir
Development technological countermeasure
