Research On Marine Gas Hydrates 3D Geologic Modeling

Gas hydrate is a future energy with huge potential value in the 21 st century, and has attracted the attention of Governments and scientific research departments.The large-scale research projects for marine gas hydrate, such as 118 special and 127 engineering, were launched in China. With the degree of in-depth exploration survey, a large number of hydrate data will be produced. Rational and effective organization to use the obtained data to the law of natural gas hydrate characteristics analysis, prediction and evaluation of resources, and reduce the cost of the ocean exploration, are the majority of marine gas hydrates science and technology work must be addressed important issues.Three-dimensional modelling techniques have played important roles in the fields of oil, gas and mineral resources, and they also have great values in the research of gas hydrate. However, it should be noted that the three-dimentional modelling is still heavily relying on specialized software, such as Petrel, Eclipse, GOCAD, etc. Currently, the exploration of gas hydrate is still in the initial phase, and the exploration data is not sufficient enough to take advantage of these software to assist gas hydrate research with 3D models. Besides, gas hyhrate related geologic, geophysic and geochimistric data are storaged in the geospatial database in form of tables, vetor maps or raster maps. The inconsistences of 2D/3D data storage, management and visualization bring a big inconvenience in the process of gas hydrate integrated studies.In this thesis, ESRI is taken as the platform studying marine gas hydrate data three-dimentsional modelling and visualisation based on GIS, the main contents are as following:1. Research basis of gas hydrate three-dimensional modelling. In this part, gas hydrate exploration fields and related data are analysed in detail, and the commonly used three-dimensional spatial data models(surface model, voxel model and hybrid model) and modelling methods are summarized.2. 3D geologic modelling based on ArcGIS. Based on the analysis of advantages and disadvantages using ArcGIS in 3D modelling, the voxel(GTP and GeoCellular) modelling methods are studied and implemented.3. The strategy of multi-scale marine gas hydrate three-dimensional modelling. Firstly, the key geologic information(taking well data and Petrel geologic model data as example) modelling and visualization based on ArcGIS are studies; then, based on the analysis of gas hydrate data multi-source and multi-scale characteristics, the strategy of multi-scale marine gas hydrate three-dimensional modelling are piloted.4. The prototype system of gas hydrate three-dimensional modelling and visualization. The prototype system is designed and implemented, which has functions including three-dimensional modelling, database management, integrated visualization, etc. It lays a solid foundation for the effective usage of gas hydrate data and the integrated gas hydrate research.