基于MDT测试资料的储层油水界面自动提取方法研究

通过对MDT地层压力数据以及地层压力梯度线形态的分析,提出了利用三次样条插值函数将有限个数据点的地层压力梯度线进行深度等间距采样,以得到连续分布的地层压力梯度线.在抛物线形式的地层压力梯度线上,油水界面对应于该抛物线的顶点.根据最大值原理可以在地层压力梯度线上提取油藏油水界面深度,利用Fortran语言编制了相应的计算机程序,实现了油藏油水界面自动提取的目的.利用该程序可以减小油田现场处理过程中带入的额外误差,节省操作人员的处理时间,减少工作量.实际应用表明,该方法是可靠的,计算结果完全符合油田储量计算的误差标准,利用其获取的结果真实有效.

Study of the method to extract oil-water interface automatically from MDT data

Based on the analyses of MDT data and the shape of formation pressure profile curves, an innovative method is proposed to gain continued formation pressure profile curves by using cubic spline function and the formation pressure profile curves can be considered as parabolic curves. In these curves, the apexes are one to one correspondence with the reservoir oil-water interfaces. Based on the peak value concept, the depth of oil-water interfaces can be extracted from these formation pressure profile curves, and correspondent program is compiled to extract the oil-water interface automatically. The possible extra error can be decreased in on-site processing using this program, the handling time of operating personnel can be saved, and the work capacity can be diminished. The reliability of this innovative method, the factuality and validity of the result of interpretation can be approved by practical applications.