核磁共振测井对电成像测井的影响

Influence of nuclear magnetic resonance logging on electrical imaging logging

许吉俊 王昕 岳明亮 李东 王健

XU Jijun WANG Xin YUE Mingliang LI Dong WANG Jian

中海油能源发展股份有限公司工程技术分公司 中海石油(中国)有限公司天津分公司 中海油田服务股份有限公司油田技术事业部

CNOOC EnerTech-Drilling & Production Co., Tianjin 300459, China Tianjin Branch of China National Offshore Oil Co., Ltd., Tianjin 300459, China Oilfield Technology Department, China Oilfield Services Limited, Tianjin 300459, China

为了研究核磁共振测井对电成像测井的影响程度，寻找一套可行的校正方法，并提出最佳的测井设计，结合核磁共振和电成像测井原理对岩心数据进行分析。分析结果表明，核磁共振测井对铁质矿物进行磁化后，短时间内可形成人工磁场，如果此时进行电成像测井，人工磁场会影响电成像极板定位，导致电成像测井图像异常。结合现场实例，通过最小二乘法拟合对测斜资料进行校正后，电成像资料基本能够满足解释评价要求，同时还可以根据地层中是否含有铁质矿物进行测井序列优化。

In order to study the influence of nuclear magnetic resonance logging on electrical imaging logging, develop a set of feasible correction methods and put forward an optimal logging design, the core data were analyzed by combining with the principles of nuclear magnetic resonance logging and electrical imaging logging.It is shown that an artificial magnetic field can be formed soon after ferruginous minerals are magnetized during the nuclear magnetic resonance logging.And if the electrical imaging logging is carried out at this time, the artificial magnetic field will affect the location of the electrical imaging pad and lead to the abnormal image of electrical imaging logging.Finally, a case study was carried out.It is indicated that the electrical imaging data can basically meet the interpretation and evaluation requirements after the inclinometry data is corrected by means of the least square fitting.Furthermore, the logging sequence is optimized respectively corresponding to the formation containing ferruginous minerals or not.

10.13639/j.odpt.2018.S0.021