| Three-dimensional modeling and visualization technology for the geological objects of oil-gas field is frontiers in the earthgeo-research, which is listed as the key research content in the national 863 project - "Key Technologies Research of Digital Oil-gas Field". By using 3D visualization technology, large numbers of geological objects in oil-gas field are constructed into three-dimensional images, so geoscientists can gain a deeper understanding of the generation, development and influence of various geological phenomena, which plays a crucial role on petroleum exploration and development. This paper mainly focused on key navigation data of surface in oil field exploration and development, three-dimensional modeling and visualization of underground geological objects, and the key technologies in software implementation, which have the theoretical and practical significance in oil and gas fields.This paper had an in-depth research on several current situations such as multi-source, heterogeneous, vast amounts of data characteristics and data services technology of the domestic and foreign oil-gas field, geological modeling technology of both surface and underground, 3D visualization tools and softwares in the oil industry and so on. From the beginning of visualization requirements of the key geological bodies in oil-gas fields, this paper analyzed seismic volume, reservoir simulation results, reserve data, stratigraphic structure and reservoir profiles, studied the three-dimensional modeling and visualization technology of these objects and raised the design and implementation method to extensible three-dimensional program framework. The innovative and exploratory work is mainly as follows:1) In the seismic data, three-dimensional display technology mainly focused on the LDM data organization, surface rendering and volume rendering, ROI three-dimensional definition, interaction of arbitrary line in 3D space.2) In the reservoir simulation model visualization,OCTLOD data organization techniques with the combination of the octree and LOD was put forward, which has achieved reservoir simulation model of very large data in three-dimensional visualization and interaction and can effectively control the memory occupancy.3) In visualization technology of proved reserves in oilfield, by using boundary representation model, the polygonal cylindrical model was designed to achieve three-dimensional display of reserve data. By customizing the query, displaying and interacting with layers and the wellbores integration, which could successfully meet the needs of geological comprehensive researchers and reserve managers to understand reserve information.4) A wide range of map formats were studied in oil industry, by digitalizing the structural map and using Delaunay triangulation algorithm, then the precise review of structural map was implemented in the three-dimensional space. Through using the spatial method to reservoir profile, the integration display and interaction of reservoir profile was completed.5) In digital oil-gas field, the easiest to change is data and interactive means, therefore the data services layer and data type plug-in design method were induced in the three-dimensional programe framework, which implemented easily extensible visualization framework.Seismic data interactive technology, multi-scale block tissue technology of reservoir simulation results, the display mode design of reserve data are innovative, comparing with similar software abroad. The three-dimensional visualization program framework has a rational structure design and is easy to expand. The researches and key technologies summarized in this paper have already demonstrated initially in the key projects of the national 863 program "Key Technologies Research of Digital Oil-gas Field", and it is very effective in practice. |
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