搞清楚距井眼不同距离处岩石核磁特征(即侧向核磁探测技术(LNMS))可以提高地层评价结果的可信性。用一种特殊的核磁仪可以在地磁场或永久磁铁场内实施 LNMS技术。 LNMS技术能解决的最大难题之一是确定出冲洗带径向非均质性特征(饱和流体及储层孔隙度和渗透率的函数)。应用 LNMS仪在地磁场进行的井下实验测量证明了划分泥浆污染带,识别油、气、水层的可能性。定量确定冲洗带浅、深部分的自由流体指数,从而可更准确地确定出储层孔隙度和渗透率。 It is clear that the NMR features at different distances from the wellbore (ie, lateral nuclear magnetic detection (LNMS)) can enhance the credibility of the formation evaluation. A special nuclear magnetometer can be used to implement LNMS technology in geomagnetic or permanent magnet fields. One of the biggest challenges LNMS technology can solve is to determine the radial heterogeneity of the wash zone (saturation fluid and reservoir porosity and permeability). Downhole experiments using the LNMS instrument at the geomagnetic field have demonstrated the potential of dividing mud-polluted zones and identifying oil, gas and water layers. Quantitatively determine the free and fluid index of the shallow and deep sections of the wash zone to allow for a more accurate determination of reservoir porosity and permeability.