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丹２１井是我国在碳酸盐岩地层中钻的第一口水平井。由于水平井井轴与地层界面的相交关系不同于垂直井，故给测井解释带来许多新的、严重的困难。自然伽马曲线会出现延滞现象，补偿中子曲线值存在偏高现象，补偿密度曲线值存在降低情况，补偿声波曲线受地层界面的影响可能造成声波跳波，感应、三侧向及井径曲线仅能作为参考曲线。

HORIZONTAL WELL LOGGING INTERPRETATION OF CARBONATE ROCK FORMATION

??Well Dan-21 is the first horizontal well drilled in carbanate rock formation in China.The intersecting relation between horizontal borehole axis and bed boundary makes logging interpretations very difficult.Natural gamma rays appear delayed-stasnant phenomena.Compensated neutron curve value is a little high,Compensated density curve value is deduced.It is possible that compensated acoustic curve is influenced by bed boundary to make acoustic wave beat.Induction,laterolog 3 and caliper curve are only as reference curves.The curve leagth at delayedstagnant nit6rval and investigation depth,the intersection angle between bed boundary and borehole,stratigraphic dip and inclination,logging method are influened by different direction.Through analysing the delayed-stagnant phenomena appearing in the above logging curves and combining geological and seismic data,the stratum division of the well is proposed out.4 gas reservoir-members are interpreted in the fault under P₁m²A.Logging interpretation model of horizontal well in carbonate rock formations is discussed.The formula of extracting porosity by compressional wave interval transit time is corrected.