西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

孔洞型储层电阻率理论模拟及影响因素

张兆辉1,高楚桥2,高永德3   

  1. 1. 中国石油勘探开发研究院西北分院,甘肃兰州730020
    2. 长江大学地球物理与石油资源学院,湖北荆州434023
    3. 中海油南海西部研究院,广东湛江524057
  • 出版日期:2014-04-01 发布日期:2014-04-01

Theoretical Simulation and Analysis Factors of Resistivity in
Vuggy Reservoir

Zhang Zhaohui1, Gao Chuqiao2, Gao Yongde3   

  1. 1. Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou,Gansu 730020,China
    2. School of Geophysics and Oil Resource,Yangtze University,Jingzhou,Hubei 434023,China
    3. Research Institute of West of South Sea,CNOOC,Zhanjiang,Guangdong 524057,China
  • Online:2014-04-01 Published:2014-04-01

摘要:

碳酸盐岩储层导电机理复杂,电阻率影响因素众多,储层划分及流体性质识别难度较大。通过构建合理的孔
隙结构物理模型,理论模拟储层电阻率,并对各种影响因素(喉道粗细、地层水电阻率、岩石基质电阻率、孔洞延展方
向及大小等)逐一进行分析,进一步探讨了各因素对电阻率的影响程度,较好地解释了电阻率异常层的成因。孔洞型
储层电阻率随喉道直径增加快速下降,而随基质、地层水电阻率增加而增大;平行电流方向的孔洞延展对电阻率的影
响高于垂直电流方向的孔洞延展,孔洞尺寸沿着电流方向增大,电阻率呈降低趋势。喉道直径对电阻率的影响高于孔
洞尺寸;喉道直径对全含水岩石电阻率的影响大于全含油,而岩石基质电阻率、地层水电阻率、孔洞延展方向及大小则
相反。

关键词: 孔洞型储层, 孔隙结构, 物理模型, 理论模拟, 电阻率

Abstract:

Because of the many factors influencing the resistivity of carbonate reservoir and the complex conductive mechanism,
it is difficult to identify the reservoir and interpret the property of fluids. On the basis of pore-structure physical model,
we simulated the resistivity of reservoir,and analyzed the factors which affect the resistivity of reservoir. The factors include
the throat size,the resistivity of formation water,and the resistivity of matrix,and the vuggy size,and so on. At last,the
influencing degree to resistivity of reservoir is discussed and the reason of abnormal resistivity in carbonate is interpreted in
this paper. The resistivity of reservoir gradually reduces with the throat diameter increasing,and increases as the resistivity of
matrix and formation water increases. Vuggy extension influence on resistivity along the direction of the current is higher than
that along the vertical current direction. With the vuggy size along current direction increasing,the resistivity reduces. The
effect of throat diameter on the resistivity of reservoir is bigger than vuggy size. The effect of throat diameter on the resistivity
of completely water-saturated rocks is bigger than on completely oil-saturated rocks,but for the resistivity of the matrix and
the formation water,the extended direction and size of the vuggy,the condition is opposite.

Key words: vuggy reservoir, pore structure, physical model, theoretical simulation, resistivity