油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (2): 50-55.

• 石油工程 • 上一篇    下一篇

钻遇断层阵列侧向测井响应特性正演研究

杨勇1,2,李亨1,2,杨多1,2,杜双军1,2,彭杰1,2,陈坤1,2   

  1. 1. 长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100
    2. 长江大学地球物理与石油资源学院,湖北 武汉 430100
  • 收稿日期:2018-08-31 出版日期:2019-04-26 发布日期:2019-05-07
  • 作者简介:杨勇(1992—),男,在读硕士研究生,电法测井正反演。

Forward simulation of response characteristics of the array lateral logging in drilling process of fault

Yang Yong1,2,Li Heng1,2,Yang Duo1,2,Du Shuangjun1,2,Peng Jie1,2,Chen Kun1,2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China
    2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China
  • Received:2018-08-31 Online:2019-04-26 Published:2019-05-07

摘要:

通过建立直井钻遇断层三维正演模型,采用有限元算法实现了阵列侧向测井响应的数值模拟。分析了钻遇断层时不同断层倾角、断距及围岩电导率对阵列侧向测井响应特征的影响。研究结果表明:在钻遇到破碎带时,断层倾角越大,视电阻率反映出的破碎带宽度越小。随着阵列侧向测井仪器浅测模式到深探测模式,断距越大(≤4 m)测得的视电阻率也会越接近破碎带及围岩的电阻率。相同探测模式下随着下围岩电阻率不断增大,视电阻率也会不断增大。在探测模式及围岩电阻率相同时,钻遇断层下盘的视电阻率会随着围岩电阻率的增大而减小。

关键词: 阵列侧向测井, 断层, 有限元, 三维地质建模

Abstract:

Firstly, we established a 3D forward model of the vertical well when drilling in faults, the response of the array lateral logging was numerically simulated by the finite element method. And then, we analyzed the effects of different fault dip angles, fault distances, and surrounding rock conductivity on the characteristics of array lateral logging response in the drilling process of fault. The results showed that when in the drilling process of the fracture zone, the larger the fault dip angle was, the smaller the width of the fracture zone would be reflected by the apparent resistivity. As the array lateral logging equipment went deeper and the fault distance(≤4 meters) got greater, the measured apparent resistivity would be closer to the resistivity of the fractured zone and surrounding rocks. When under the same detection mode, the apparent resistivity would increase with the increasing of the resistivity of lower surrounding rocks. When the detection mode and the surrounding rock resistivity were the same, the apparent resistivity would decrease with the increase of the resistivity of the surrounding rock while drilling the footwall of fault.

Key words: array lateral logging, fault, finite element, 3D geological modeling

中图分类号: 

  • TE132.1