基于RSD方法随钻测井曲线实时对比技术研究

Research on Comparison of LWD Curve Based on Relative Strata Depth Method

水平井测井曲线测深与真实垂直深度对比分析,依靠人工经验对曲线形态进行判断存在较大误差。提出了相对地层深度方法(Relative Strata Depth,RSD)用于水平井随钻测井曲线实时对比,RSD采用三次样条插值函数计算水平井测井曲线垂直深度及RSD刻度,将水平井测井曲线按照地层关系投影至垂直道上,实现多井测井曲线形态和数值的直接对比。该方法能够显著提高随钻测井曲线对比准确度、地质导向精度和工作效率。

Comparison between measured depth and true vertical depth of horizontal well logging curve depends on artificial experience,which has bigger errors.Relative strata depth(RSD)method to compare horizontal well logging curve in real time is present.RSD computes vertical depth and RSD scale of horizontal well logging curve by cubic spline interpolation function,and horizontal well logging curve is projected to the vertical pathway based formation relation,so the shape and data of multi-well logging curve can be compared directly.The application suggests that RSD method can improve comparison accuracy,geology steering precision and work efficiency.