摘要
随着油气勘探开发领域由构造油气藏向缝洞、薄层、断层等非常规复杂油气藏转移,随钻电磁波边界探测技术在主动地质导向与精细储层刻画方面发挥着重要作用,能够用于探边、避水、预警、前探盐丘、预判高压地层与枯竭层等。随钻前探测电磁波测井仪器采用正交或水平天线,与传统电磁波仪器相比,大大提高了前探距离。阐述了一种随钻前探测电磁波测井仪器的典型天线系统以及相应的前探测响应信号计算方法,应用三维几何因子、镜像源等效法分析了不同磁场分量的前探测敏感性。计算了不同地层电阻率下随钻前探测电磁波测井的响应特征,分析了随钻前探测的影响因素,针对界面两侧地层电阻率对比度、地层电阻率背景值等环境影响因素以及仪器频率及源距等参数进行了分析。数值模拟结果表明,正交或倾斜天线系统的前探距离受天线距离、工作频率、地层电阻率对比度等多种因素影响,通过优化发射-接收天线的排列方式、频率、天线距离等参数,能够获得较大的前探距离。
With the transfer of oil exploration from structural reservoirs to very complex unconventional reservoir,such as fracture cave,thin-layer and fault,electromagnetic wave boundary detection technology while drilling plays an important role in geological guidance and reservoir characterization,which can be used in edge exploration,water avoidance,early warning,salt dome pre-exploration,predetermination of high pressure formation and depleted layer,etc.The look-ahead electromagnetic wave resistivity logging while drilling tool adopts orthogonal or horizontal antenna,which greatly improves the forward detection distance compared with the traditional electromagnetic wave logging tool.We describe the method and antenna system of typical look-ahead tool,and analyses look-ahead sensitivity of different magnetic field components through three-dimensional geometric factor and mirror source equivalent method in this paper.The response characteristics of look-ahead tool under different formation resistivities are calculated,and several influencing factors of measurement while drilling are analyzed.The environmental factors such as formation resistivity contrast on both sides of the interface,formation resistivity background value,instrument frequency,source distance and other parameters are analyzed.The numerical simulation results show that the look-ahead detection distance of orthogonal or inclined antenna system is affected by many factors such as antenna spacing,working frequency and formation resistivity contrast.By optimizing the parameters such as transmitting receiving antenna arrangement,frequency and antenna spacing,a large look-ahead detection distance can be obtained.
作者
田园诗
朱军
牒勇
鲁晔
刘刚
关浩
TIAN Yuanshi;ZHU Jun;DIE Yong;LU Ye;LIU Gang;GUAN Hao(Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi,710077;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi,710077;Changqing Branch,China National Logging Corporation,Xi’an,Shaanxi,723507)
出处
《测井技术》
CAS
2022年第6期676-682,共7页
Well Logging Technology
基金
中国石油天然气集团有限公司项目“随钻远探测电磁波电阻率成像测井仪器研制”(2021ZG04)。
关键词
随钻电磁波测井
前探测
前探距离
各向异性
数值模拟
electromagnetic wave logging while drilling
look-ahead
look-ahead detection distance
anisotropy resistivity
numerical simulation
