城市级三维地质建模的统一地层序列方法

Unified stratigraphic sequence method for three dimensional urban geological modeling

三维地质建模是'智慧城市'建设的基础内容之一,涉及数百平方公里到数千平方公里的城市级地质范围。由于城市级地质范围跨越地质单元多、地质情况复杂,传统的三维地质建模方法对跨地质单元的地层连线考虑不足,常导致不同地质单元间的地层连线出现错误。针对该问题,提出一种基于地层沉积顺序的统一地层序列方法,进而识别钻孔分层中的缺失和倒转情况,将同一岩性中倒转与正常的情况加以区分,避免建模时的错误连线或插值。通过添加0厚度层,使所有钻孔的地层序列可完全一致,构建各钻孔分层间的对应关系,以降低不同地质单元间的地层连线错误率。通过讨论地层缺失、倒转、重复等特殊情况和实例验证,研究结果能够有效地对城市级三维建模中各种地质情况的连线问题做出明确的判断,减少在跨越地质单元多、地质情况复杂的城市级三维地质建模中的地层连线错误,为'智慧城市'建设提供底层支撑。

Three dimensional geological modeling is one of the basic tasks for the construction of'smart city',which involves urban-level geological range from hundreds to thousands of square kilometers.Because the urban geological model spans many geological units and the geological conditions are complex,the traditional three dimensional geological modeling methods have insufficient consideration of correct stratigraphic connections across different geologic units.A unified stratigraphic sequence method based on stratigraphic sedimentary sequence can identify the special condition such as stratum loss and stratum reversal,thus both the abnormal and the normal cases can be identified,avoiding incorrect interpolation in 3 D geological modeling.By adding zero-thickness layers,the stratigraphic sedimentary sequence of all drilling holes can be completely consistent,and the match-up of stratum between drilling holes are constructed.In this paper,three special cases of stratum loss,reversal and repetition are discussed in detail,and this method is verified in different examples.The results can effectively make a clear judgment on the connection problems of various geological conditions in the three dimensional geological modeling in the urban.It can reduce the incorrect stratum connection in the three dimensional urban geological modeling with complex geological conditions and many geological units,and it provides efficient support for the development of'smart city'.