关键词: 三维地层模型, 偏差修正, Voronoi图, 钻井影响域

Abstract: The accuracy of three-dimensional stratigraphic models can affect their applications directly. It is an important strategy to use the multiple data coupled modeling to improve the accuracy of the model. Based on analyzing the factors influencing the accuracy of the three-dimensional stratigraphic model and taking geological planar data and drilling data as examples, this paper presents exploratory analysis methods used to automatically detect the deviation between the different types of data; and corrected method which mainly adopts GIS analysis of space exploration and drilling domain influence technology is supplied. The basic idea is described as follows. Firstly, to extract drilling data and geological planar data of a formation interface, and combine them to establish a Voronoi map. Secondly, to detect the deviation of drilling data relative to the geological data by the entropy or clustering attributes of each unit assigned to Voronoi map, and extract the drilling with the largest deviation accordingly. Finally, to modify locally the geological planar data by using drilling influence domain technique. The test results indicate that this method enables to realize the consistent process of data of multiple stratigraphic coupled modeling with high efficiency and relatively reliable result.

Key words: 3D stratigraphic model, modifying deviation, Voronoi map, drilling influence domain