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介绍了HRDL高分辨率双侧向测井仪的原理及特点。为详细分析HRDL和普通双侧向测井仪电极系之间的探测特性差异,采用数值模式匹配算法(NMM)建立了不同地层模型,对2种电极系结构进行测井响应数值模拟。2种电极系探测深度和侵入特性接近,但HRDL对薄层分辨能力比普通双侧向测井仪强,层界面显示清晰;在中高电阻率地层,HRDL测量值与普通双侧向测井仪吻合较好,但在低电阻率地层,2种电极系由于受井眼影响程度不同,测量曲线幅度存在明显差异。
The principle and characteristics of HRDL high resolution dual lateral logging tool are introduced. In order to analyze the difference of detection characteristics between the HRDL and the ordinary double-side logging tool electrode system, different formation models were established by numerical pattern matching algorithm (NMM), and the logging responses of two kinds of electrode system were numerically simulated. The detection depth and intrusion characteristics of the two kinds of electrodes are close, but the resolution of HRDL to thin layers is stronger than that of ordinary double-side tools and the interface of layers is clear. In medium-high resistivity stratum, However, in low-resistivity formations, the magnitude of the measured curve is significantly different for the two electrode systems due to the different degrees of influence from the borehole.