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利用钻头和地层相互作用三维钻速方程及井眼曲率等预测计算模式，分析地层特性对井眼轨道的影响规律，并通过实钻数据和理论分析曲线加以说明。地层各向异性有使井限沿地层可钻性最大方向变化，即地层使井眼沿岩石易被破碎方向偏移。地层岩石破碎状态指数越大，越有利于井眼沿钻头轴向或井眼轴向方向前进，地层岩性松软或者说地层可钻性越好，这种作用越明显，实际钻进时，软地层和可钻性好的一些泥岩、砂岩地层钻具造斜率降低就有地层的这种影响作用。
Based on the three-dimensional drilling rate equation and the curvature of wellbore, the influence of formation characteristics on the wellbore trajectory is analyzed and the actual drilling data and theoretical analysis curves are used to illustrate this. Stratigraphic anisotropy allows the well limits to vary along the maximum direction of formation drillability, that is, the formation causes the wellbore to deviate in a direction along which the rock is easily crushed. The larger the rock fragmentation index is, the better it is to move the wellbore along the axial direction of the drill bit or the axial direction of the borehole. The stratum lithology is soft or the formation drillability is better. The more obvious this effect is. When actually drilling, the soft Stratigraphy and drillability of some good mudstone, sandstone strata down the slope of the formation of strata this effect.