基于井地电阻率技术的水驱前缘解释新方法  

A New Method of Water Drive Front Interpretation Based on Borehole-to-Surface Resistivity Technology

作　　者：白泽[1,2] 谭茂金 张福莱[3] BAI Ze;TAN Maojin;ZHANG Fulai(School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China;School of Earth and Environment, Anhui University of Science and Technology, Huainan, Anhui 232001, China;Beijing Horizontal Hualong Petroleum Technology LTD., Beijing 100049, China)

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]安徽理工大学地球与环境学院,安徽淮南232001 [3]东方华隆(北京)石油技术有限公司,北京100049

出　　处：《测井技术》2022年第1期71-76,共6页Well Logging Technology

基　　金：国家自然科学基金“有机页岩电学特性多尺度分析与测井解释新方法”(41774144);安徽理工大学人才引进基金“煤层气测井综合识别与评价技术研究”(13200427)。

摘　　要：井地电阻率技术通过在井中激发电流源,利用地表观测异常电位信号进行目的层电阻率反演,以达到对水驱前缘探测的目的。但随着注水层埋深的增加,反演的电阻率受注水层上方地层电性信息的影响增大,降低了对水驱前缘的解释精度。该研究基于井地电阻率技术基本原理,利用阻尼最小二乘法开展目的层电阻率反演,并提出1种新的注水井水驱前缘探测方法。首先,利用点电流源在注水层的底部和顶部分别进行激发,然后对地表观测的电位异常分别进行电阻率反演,最后利用这2次电阻率反演结果的差值进行水驱前缘解释。通过对理论注水模型的实验分析表明,新探测方法比单次观测反演的效果更好,对注水体边界的识别精度更高,有效提高了水驱前缘的解释精度。The borehole-to-surface resistivity technology is to excite the current source in the well,and use the abnormal potential observed on the surface to carry out the resistivity inversion of target layer,so as to achieve the purpose of water drive front detection.However,with the increase of water injection depth,the inversed formation resistivity is more affected by the electrical information above the water injection layer,which reduces the interpretation accuracy of water drive front.This paper based on the basic principle of borehole-to-surface resistivity technology,uses the damped least square method to carry out the resistivity inversion,and a new water flooding front detection method was proposed.Firstly,the point current source is used to excite at the bottom and top of the water injection layer,and then the formation resistivity of water injection layer was inversed based on the potential anomaly observed on the surface respectively.Finally,the differences between the inversed resistivity of the two times are used to interpret the water drive front.The experimental analysis of the theoretical water injection model shows that the new detection method can eliminate the influence of the electrical information at the top of the water injection layer,and has better recognition effect on the boundary of the water injection layer,which effectively improves the interpretation accuracy of the water drive front.

关 键 词：井地电阻率技术 电阻率反演 注水井 水驱前缘 探测方法 

分 类 号：P631.84[天文地球—地质矿产勘探]