Towards automatic and rapid 3D geological modelling of urban sedimentary strata from a large amount of borehole data using a parallel solution of implicit equations

The number of boreholes investigated by geotechnical methods in long-term urban geological surveys can reach tens of thousands or even hundreds of thousands. These borehole data form a globally discrete and locally concentrated spatial distribution pattern. How to combine a large amount of unevenly distributed borehole data and large-scope geological expert knowledge to efficiently and accurately build 3D geological models is an urgent problem in urban 3D geological modelling. This paper presents a parallel and efficient Hermite radial basis function (HRBF) implicit 3D geological modelling method that can handle a large amount of borehole data while considering geomorphic unit constraints. The fast and stable solution of the HRBF implicit geological interface is completed based on the block parallel solution. The marching tetrahedron (MT) method is used to visualize the geological model. Finally, this paper conducts 75 standard strata and 18 h of automatic fine-scale 3D geological modelling based on 28,071 borehole data and conducts section spatial analysis. This paper and SKUA-GOCAD software have carried out several sets of comparative modelling experiments at the same data level, and the results show that the proposed modelling process improves the efficiency of geological modelling and geological analysis.