油基泥浆环境下储层电阻率动态剖面反演方法研究及应用

Research and Application of Reservoir Dynamic Profile Inversion Method in Oil-based Mud Environment

基于油基泥浆环境下的时移电阻率测量数据,采用增阻模型及联合反演原理,并考虑测井时间对电阻剖面的影响,开展了油基泥浆环境下的储层电阻率动态剖面方法研究及应用,结合实测井资料,利用随钻电磁波电阻率实时测量数据和上提复测测量数据进行联合反演,得到主、复测泥浆侵入深度、侵入带电阻率以及地层真电阻率值等储层电阻率动态剖面,在此基础上结合宁波油田四口实测井的物性参数,统计分析了储层孔隙度、渗透率、饱和度以及孔渗比与钻井液侵入深度的关系,说明油基泥浆对储层具有一定的保护作用。

Based on the time-shifted resistivity measurement data in an oil-based mud environment,a resistance-increasing model and a joint inversion principle were used,and the effect of logging time on the resistance profile was considered. A dynamic method of reservoir resistivity profile in an oil-based mud environment was developed. Research and application,combined with real-world logging data,using the real-time measurement data of the electromagnetic resistivity while drilling and the retested measurement data to perform joint inversion,to obtain the main and remeasured mud intrusion depths,intrusion zone resistivity,and formation true resistivity values Based on the constant resistivity dynamic profile of the reservoir,and on the basis of the physical parameters of the four well logs in Ningbo Oilfield,the relationship between the porosity,permeability,saturation,and porosity of the reservoir and the penetration depth of the drilling fluid was statistically analyzed. Mud has a certain protective effect on the reservoir.