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引言为了评价井眼、侵入带和围岩对三侧向测井(聚焦测井)的影响,必须了解它的空间响应。幸运的是,只要地层之间的电阻率差别不大(≤100:1),地层不太薄(如用3吋主电极时,≥2呎),并较呈水平状时,聚焦测井比其它测井仪器更适于进行简易分析。因为它在均质环境中的电流和电位分布状况较为简单,而更主要的是,实际地层条件对基本几何图形的干扰比较小。
INTRODUCTION In order to evaluate the effects of boreholes, invaded zones and surrounding rock on three-sided logging (focus logging), one must understand its spatial response. Fortunately, as long as the difference in resistivity between layers is small (≤100: 1) and the formation is not too thin (≥2 feet for a 3-inch main electrode) and is more horizontal, the focus logging ratio Other logging tools are more suitable for simple analysis. Because its current and potential distribution in a homogeneous environment is relatively simple, but more importantly, the actual formation conditions have less interference with the basic geometry.