中文摘要：

钻井地质参数是钻井工程设计的基础数据，由于地层的复杂性、预测模型的精度以及解释资料的误差等问题，地质参数的解释评价结果误差客观存在，其真值会分布于某区域内。首先提出钻井地质参数不确定性的概率分布和不确定度两种描述方法；然后基于层序地层学、概率统计等相关理论和方法，将同组地层内某段地层作为样本区间，区间内的地质参数作为一组测量样本，建立地质参数不确定性分析及量化描述方法，并基于信息扩散原理确定钻井地质参数的概率分布函数。实例分析表明，建立的钻井地质参数不确定性定量描述及分析结果更切合工程实际。

英文摘要：

The geological features of the rock formation to be drilling in terms of drillability and safety are very important for the drilling engineering design. The description and evaluation of the actual geological parameters are difficult due to the complexity of petroleum geology, the incompleteness of the data obtained and the lack of accuracy of the mathematical models that can be used. In fact, the geo-data obtained should be within a particular region around their actual values. In this paper, the assess-ment methods to describe the uncertainties of the geological parameters in terms of drilling were presented, including the proba-bility distribution and the uncertainty description. The uncertainty analysis and their quantitative description of the geological parameters were conducted based on principles of probability, statistics and stratigraph, in which the geo-parameters were iden-tified and classified in the same groups based on different stratigraphic formations as sample intervals. Then the probability dis-tribution function of the drilling geological parameters was determined based on the information diffusion theory. The methods can make the quantitative description of the drilling geological parameters more relevant to the practical engineering conditions.