지하 정보 3차원 시각화 시스템 구축에 관한 연구

Abstract

This study concerns the development of subsurfce information system that can analyze various subsurface information easily and promptly. Thc data types that I posed to visualize are 3-D latticed array acquired from wells. Volume visualization techniques are applied to visualize 3-D latticed data. The well-core data are digitized to a database and the subsurface objece such as wells and orebodics are visualized three-dimensionally to allow users to extract accurate and realistic information rapidly. A visualization module to systematically analyze and manage three-dimensional seismic data is developed. The visualization is performed by converting each sample to vertical or horizontal polygon and assigning seismic information to its attribute. The spatiality of the visualized slice or volume is controlled by dialog boxes of sliders and buttons. What is more for the module is that it can visualize a wireline log as a pipeline farm with its log values allotted to a database table. Another more is the picking ability for seismic horizons. The points picked in guide of this module can be delivered to the modeling module developed here to visualize a seimic event. A modeling software, that constructs 3-D shapes by interpolating 2-D cross-sections, is developed. The software can extract a cross-section in any direction and inclination from the model, then update its form by adjusting the cross-section iteratively. This software was applied to real data to model an orebody. It is found that the most important point for high-quality modeling is the setup of control points, which is influenced by experience and knowledge of the user. The modeling software has additional tool that abstracts lithology on a certain elevation from available core descriptions, which is valuable for verification of the model. This function ascertained that there are some mismatches between the cores and the model, which is caused by exclusion of informations from vertical and in-clined wells when producing the input cross-sections. The database system of geologic columns simplified the implementation of storage, modification, and maintenance of the data, and it also enabled the real-time retrieval for the voluminous amount of data, which was not possible by hand. The seismic cube, well logs, and orebodies that are embodied as 3-D objects will provide spatially expanded information to help us reach a better decision in designing ground/underground structures by giving higher reality than those in 2-D.