岩石各向异性在水平井测井解释中的应用

水平井测井解释面临的新问题是地层各向异性的影响，为更好地了解地层各向异性的大小及其对测井值的影响，在实验室建立了测量岩石各向异性的装置和方法。取与水平井同一层段的岩心，按层界面切割出立方体，测量不同方向上参数的变化。所有的砂泥岩样品都显示了在垂直层界方向渗透率最小、声波速度最小、电阻率最大的特征。由此算出岩石各向异性系数，并对水平井电阻率曲线进行校正。

Laboratory Measurement of Rock Anisotropy and Its Application to Horizontal Well Log Interpretation.

A new problem emerging in horizontal well log interpretation is caused by the effect on formation anisotropy. We have established the method and apparatus for laboratory measurement of rock anisotropy in order to better understand the degree of anisotropy and its influence on log curves. The cubic samples were cut from whole cores taken from interested reservoir based on bedding plane. Measurements were conducted in different direction of samples to study the parameter changes. All of the measurements indicated that the permeability and the acoustic velocity are of the minimum values in perpendicular formation boundary and the resistivity is of the maximun values. With these data, an anisotropy factor can be calculated, and the horizontal well log curves can be corrected.