电成像测井的偏心校正方法研究  

Method of Eccentricity Correction of Electric Imaging Logging

作　　者：张翔[1] 张梦宁[2] 李文忠[3] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100 [3]辽河石油职业技术学院,辽宁盘锦124103

出　　处：《石油天然气学报》2013年第3期96-98,166,共3页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2011ZX05017-001-HZ01);中国石油科技创新基金项目(2011D-5006-0306);湖北省教育厅科学技术研究计划优秀中青年人才项目(Q20101310)

摘　　要：当电成像仪器存在偏心时,电成像图像不能真实反映井壁周围的地层信息,影响地质解释与应用。基于电成像测井的井径曲线,采用最小二乘法对椭圆井眼进行拟合,提取椭圆参数;在此基础上,计算仪器各极板在椭圆井眼中的位置,得到真实的井壁微电阻率图像。哈里伯顿的微电阻率井眼成像(EMI)测井仪实测的电成像偏心校正结果表明,该算法提取的椭圆参数准确,得到了真实的井壁周围地层的图像,为后续精细评价提供真实的资料。The images of electric imaging logging could not reflect real formation around borehole,when the electric imaging logging instruments were eccentric,it would influence geological interpretation and application.An algorithm of least square was used for fitting ellipse wellbore based on diameter curves of electric imaging logging and the ellipse parameters were derived.On the basis stated above,the locations of all pads of instrument in the ellipse well are calculated,and the real micro borehole electric image is obtained.The result of EMI logging instrument from Halliburton shows that the estimated ellipse parameters are exact,it provides real formation for fine logging evaluation at the stage.

关 键 词：电成像测井 最小二乘法 椭圆拟合 偏心校正 

分 类 号：P631.84[天文地球—地质矿产勘探]