摘要
芭蕉场潜伏构造位于四川盆地川东南中隆高陡构造区温泉井构造带,区块内断裂系统复杂,因此压力系统划分、气水分布特征分析也有一定难度。芭蕉场区块石炭系气藏已投产7口井中,5口井已产出地层水,其中4口井水淹停产。为了制定开发技术对策,必须在摸清气藏压力系统的基础上,明确各压力系统的气水分布特征。为此,利用三维地震解释成果、钻探成果,开展构造及圈闭特征分析;并根据储层纵横向展布特征,确定各断层的封堵性;再结合压力测试资料及流体性质分析成果,综合判断各井之间的连通性,划分气藏压力系统;继而在此基础上,结合测井解释成果及完井测试成果,确定气藏的气水界面。研究成果表明:(1)芭蕉场石炭系气藏可划分为5个独立的压力系统,即B1井区、H4井区、H5井区、H3井区、H2井区;(2)气藏没有统一的气水界面,上述5个压力系统对应的气水界面海拔分别为-3935 m、-3806 m、-3895 m、-4340 m、-4250 m。综合气藏多种静态、动态资料所进行的压力系统划分和气水分布特征分析,有助于开发技术对策的制定,有助于排水采气措施的开展,对芭蕉场区块勘探开发具有重要的指导意义。
Bajiaochang buried structure stands at Wenquanjing tectonic area of high-steep structure belt in middle uplift of southeastern Sichuan Basin.It is difficult to divide pressure system and analyze gas-water distribution characteristics on account of complicated fractures in the structural belt.Among 7 wells with the Carboniferous gas reservoirs as the target,which have been put into production in Bajiaochang block,there are 5 wells with water production and 4 of them in flooding production suspension.It is essential to figure out these distribution characteristics depending on explicit pressure system within the reservoirs in order to make certain countermeasures on development technology.Thus,both structural and trap features were analyzed by means of 3D seismic interpretation and drilling practice.And then,a few sealing properties of each fault were summarized on the basis of longitudinal and horizontal reservoir distribution.Thirdly,combined pressure data with fluid properties,the pressure system was classified and the connectivity between wells was estimated.Finally,the gas-water contact was achieved for the reservoirs from well-logging interpretation and completion.Results show that,in these Carboniferous gas reservoirs,there exist 5 isolated pressure systems without whole gas-water contact,namely B1,H4,H5,H3,and H2 well areas accompanying with 3,935 m,3,806 m,3,895 m,4,340 m,and 4,250 m below sea level,individually.For most gas reservoirs,to classify the pressure system and to analyze the gas-water distribution characteristics depending on multiple static and dynamic data are conducive to making countermeasures on development technology and drainage gas recovery,which may be value in exploration and development of Bajiaochang block.
作者
邓力菁
陈波
李怡雯
周永志
Deng Lijing;Chen Bo;Li Yiwen;Zhou Yongzhi(Northeastern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Dazhou,Sichuan 635000,China;Chongqing Gas District,PetroChina Southwest Oil&Gasfield Company,Chongqing 400021,China)
出处
《天然气勘探与开发》
2022年第S01期13-20,共8页
Natural Gas Exploration and Development
关键词
断裂系统
有水气藏
压力系统
地层水
气水分布特征
气水界面
Fracture system
Water-bearing gas reservoir
Pressure system
Formation water
Gas-water distribution characteristics
Gas-water contact
