自然电位测井数值计算中的激励源分布
Journal of Jilin University(Earth Science Edition)(2012)
Abstract
为实现自然电位测井的高效正演计算,以定量研究各种因素影响,针对自然电位的激励源——偶电层的分布进行了研究。通过对自然电位产生原因及偶电层对自然电位贡献的分析,认为只有泥岩井壁、侵入带中砂泥岩界面和侵入带与原状地层分界面处的偶电层对自然电位测井值有贡献,而研究砂岩层处的自然电位异常,则仅考虑由侵入带与原状地层界面处的偶电层即可。通过直流电场与静电场的类比,推出了偶极源的面电流密度表达式,并通过计算研究了均匀介质中侵入深度的影响。结果显示,自然电位曲线形状随侵入深度增加而变得平缓,异常幅度减小。
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Key words
Electric double layer,Electrochemical EMF,Influence of invasion depth,Spontaneous potential logging
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