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井环境对阵列感应测井响应的影响分析

DOI: 10.6038/cjg20130433, PP. 1392-1403

Keywords: 矢量有限元法,井眼,阵列感应测井,校正

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Abstract:

阵列感应测井资料经常出现与井眼环境有关的质量问题.采用三维矢量有限元法分别在椭圆形井眼、仪器偏心及斜井条件下的阵列感应测井原始响应进行了模拟,并对环境校正和合成聚焦后的数据进行了分析.结果表明,线圈距较短的原始测量信号更易受井眼椭圆度、仪器偏心、泥浆电阻率及与地层电阻率反差的影响;而合成聚焦后的浅探测曲线虽然经过了环境校正和合成聚焦等数据处理,但仍然受这些因素的影响,这反映出阵列感应测井的数据处理是不完善的或采用的校正模型是理想化的;在井斜影响方面,浅探测曲线受井斜角大小影响相对较小,深探测曲线在井斜角为60°以上时受其影响较大而必须进行进一步处理.

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