过套管电阻率测井数据处理及其在油气层评价中的应用

根据过套管电阻率(CHFR)测井的测量原理,讨论了视电阻率的影响因素,提出了CHFR曲线的影响因素校正与刻度方法,分析了CHFR测井数据在吐哈丘陵油田油藏动态监测中的实际应用效果.CHFR测井的视电阻率与仪器的刻度系数受到套管接箍、射孔及井壁接触等因素影响.针对套管接箍、套管腐蚀或射孔等的影响,提出了平滑滤波的校正方法.对于CHFR测井的刻度,采用了稳定泥岩层及纯含水段的套管电阻率值与深感应或深侧向曲线的最佳拟合,减小由非仪器因素造成刻度系数变化的影响.通过对吐哈丘陵油田4口井过套管电阻率测井资料的处理与解释,初步显示了CHFR测井在寻找未动用油层或漏失油层、已开发储层的水淹程度及储层中剩余油饱和度评价方面的良好应用前景.

Data Processing of Cased Hole Formation Resistivity Logging and Its Application

Based on analyzing principle of Cased Hole Formation Resistivity(CHFR) tool,several influence factors on the CHFR apparent resistivity are discussed,and then suggested are that the effect of casing collar,casing corrosion or perforation can be corrected with a 5-point smooth filtering,and that the effect of variable calibration coefficient of CHFR caused by factors other than the tool can be eliminated by calibrating the CHFR measurements in stable shale and water bearing layers with resistivity measurements of deep induction and/or deep laterolog in the same layers.The processed and interpreted results of the CHFR data of 4 wells in Qiuling Oilfield,Tuha,show an applicable prospect of the CHFR log in discovering nonproducing and/or missing oil-bearing zone,appraising the order of water flooding and the residual oil saturation of passed reservoir.