基于钻孔数据的三维地层建模关键技术

Key technology of 3D stratum modelling based on borehole data

在基于钻孔数据进行三维地层建模方法中,钻孔样本间地层层序不一致导致建模时难以确定各地层的拓扑关系,快速准确地确定各地层层序和充分利用钻孔数据是建模的关键难点之一。拟通过综合考虑区域内所有钻孔数据,基于地质解释方法理论,以地层出现次数频率高原则进行全自动确定地层层序。首次引入子钻孔递归思想,利用表面建模方法,自下而上逐层创建三维地层模型,可确保钻孔数据不丢失且准确地应用于地层建模中,并能适应地层尖灭、地层超覆、透镜体等复杂地质构造。该方法地学意义明确,具有鲁棒性好、运行效率高及可操作性强等特点,算法已在同济曙光软件中实现,并已在多个实际地质建模工程中得到了验证。研究结果表明,该算法能充分利用已有钻孔信息,建模过程全自动完成,对复杂地层建模亦具有较强的适应性。

Due to the inconsistent stratigraphic sequence of the stratum in the borehole sample, it is difficult to accurately determine the topological relation of each stratum in 3 D stratum model based on borehole data. Hence, one of the key technologies in the 3 D geological model is to make full use of the borehole data. Based on the theory of geological interpretation method, the stratigraphic sequences were confirmed automatically through the frequency of the stratum appearing at the upper location of all boreholes in the region. By using the surface modelling method, the recursive method of sub-drilling was first introduced to establish the 3 D stratum model layer-by-layer from bottom to top. Meanwhile, this method can also adapt to the complex geological formation, such as strata pinch-out, stratigraphic overlap, and lens. The proposed 3 D geological modelling algorithm with the advantages of precise geoscience meaning, good robustness, high efficiency and reliable operability, was already implemented into TJSG software and applied to some practical 3 D geological modelling projects successfully. The research results indicate that the proposed algorithm can not only fully use all the borehole information to create a 3 D geological model, but also has strong adaptability for complicated stratum.