适于海量数据的三维地层建模方法

MODELING METHOD OF 3D STRATA SUITABLE FOR MASSIVE DATA

三维地层建模是地下空间数字化的一个关键步骤。基于钻孔数据的三维地层建模,通过人机交互方式可以取得较好的效果,但这种方法有两个关键问题,一是建模涉及到大量的空间曲面关系的判断,过程复杂烦琐;二是海量数据建模速度较慢。在此针对这两个问题展开研究。对于第一个问题,提出了参考TIN和界面分片思想,借助多属性空间数据插值方法,动态建立搜索区域,使得复杂地层建模思路清晰,便于实现;对于第二个问题,按地层缺失情况,将整个研究区域动态划分为若干子块,分块处理海量数据,提高了建模效率。依据该建模方法,最终能够生成具有严格几何、拓扑关系的各地层界面模型。该建模方法具有快速处理海量数据和减少用户干预建模的特征。同时,该方法充分考虑了钻孔间距、地层厚度对尖灭处地层属性的影响,对于处理钻孔空间分布的不均匀性,有一定借鉴意义。

The 3D geological modeling is a committed step of underground space digitization.The results,using the method based on the borehole data and combining interaction of scholars,show that the method is effective.But there are two key issues.First,the modeling course is complicated and convoluted,second,the modeling speed when dealing massive data is relatively slow.The above two questions are analyzed.To the first question,the digital model of knowledge reasoning is set up,which adopted the space algebra method.The method,describing stratum interface information with surface patch through the interpolation of properties of space data,considered the embedment of geological knowledge into the model,and mitigated the interactions of the users.To the second questiont,he whole research area is divided into several sub-fields according to the stratigraphic lacuna.The search areas are dynamically set up using the method of projection of reference TIN and Lagrangian interpolation in that case when the sub-fields contains special geological property while using the method of projection of reference TIN in other cases.So the modeling efficiency can be improved.The stratum interface model,which has rigorously enforce geometry and topological relation,can be obtained through the proposed methods.This modeling method can deal with the magnanimity data more quickly and reduce user′s intervention,and is useful for dealing with the disparity of space distributions because of the impact of space between boreholesand the stratigraphic lacuna are considered.