摘要
水平井电阻率测井不仅需要考虑地层厚度、围岩,还需要考虑井眼斜度、地层电阻率各向异性等因素的影响。因此,相对直井而言,水平井电阻率测井响应的处理与解释更为复杂、困难。结合ARC675型随钻电阻率测井仪原理,通过数值模拟,总结出地层厚度、围岩及电阻率各向异性等环境因素对该仪器相位电阻率和振幅电阻率的影响规律。在此基础上,通过处理某水平井随钻电阻率测井资料发现:该方法不仅能准确确定水平井井眼轨迹与地层的关系,还能解释相位电阻率值与振幅电阻率值差别大以及二者与导眼井测井电阻率值相差较大的原因。其解释成果为下一步实施压裂改造等措施提供了理论依据。
LWD resistivity data are mainly used in horizontal well logging interpretation. Compared to vertical well, the responses of electrical logging in horizontal well seem to be more complicated. It not only needs to consider bed thickness and shoulder bed, but also should take borehole inclination and formation resistivity anisotropy into account. Different formation models were established for numerical simulations to analyze the responses of the ARC675 resisitivity tool to the environmental factors, including bed thickness, shoulder bed and resistivity anisotropy. A field log example is used to support the calculations presented. The method is not only used to determine the geometry relationship of well trajectory and formations precisely, but also to interpret the reason why there are large differences between the responses of phase shift resistivities and attenuation resistivities which are both highly different to the resistivities of pilot well. The results of this study can be used to guide the determination of fracturing in field application.
出处
《岩性油气藏》
CSCD
2012年第3期93-98,共6页
Lithologic Reservoirs
关键词
水平井
随钻电阻率测井
仪器响应
地层厚度
围岩
各向异性
horizontal well
resistivity logging while drilling
tool response
bed thickness
shoulder bed
anisotropy
