关键词: 岩石可钻性, 宏观性质, 非均质地层, 地层可钻性, 研究对象, 宏观与微观, 岩芯, 不均匀性, 微钻头, 非均匀

Abstract: The macroscopic properties of a homogeneous material can be known in advance from its microscopic test results.But macroscopic and microscopic properties are not the same for the heterogeneous formations whose macros copic nature is to be determined.In this paper,a hypothesis of the formation heterogeneity has been established on the basis of formation drillability analysis;the random character of nonhomogeneous formation drillability has been studied statistisally;the inference of the macroscopic nature has been done by means of the transfer of microscopic properties;and the macroscopic nature of heterogeneous formation drillability has been obtained.The following topics are discussed:microscopic drillability,the criterion of formation homogeneity,the range of the object studied,macroscopic and microscopic range,macroscopic homogeneity and its realization.The application of the hypothesis is discussed with an example.