3D Geological Modeling And Visualization Of Multi-Superimposed CBM Reservoirs

Multi-superimposed coalbed methane sysrem is an important reservoir form of coalbed methane,and it is also a hot research direction in the development of coalbed methane.Coalbed methane(CBM)engineering is complex and huge.During the commingling production,the change of reservoirs in a independent gas system is the result of multi-factor coupling.Reservoir parameters change dynamically with the process of production,and are affected by intra-layer and inter-layer interference.Numerical simulation has always been a main means to carry out research.As the foundation and difficulty of numerical simulation,especially for coal reservoirs with superimposed gas-bearing system,it is of great theoretical and practical significance to carry out three-dimensional geological modeling of reservoirs and visualize reservoir morphology,spatial distribution of reservoir parameters and dynamic changes of reservoirs during drainage and production.This paper focused on the multi-superimposed coalbed methane reservoir,took 3D modeling and visualization of the reservoir as the research objectives,selected the reservoirs of explorational area 4 of Laochang as the research objects,according to the sequence stratigraphic framework,lithofacies and gas system in this area,collected the spatial and gas production parameter data of the main coal seam,and obtained the reservoir spatial data and attribute data of the whole area through spatial interpolation method,then constructed the 3D spatial data model and attribute data model of boreholes and reservoirs on this basis.Combining with WPF 3D modeling theory,using Visual Studio 2016 development platform,C# and XAML language,it established a 3D visualization system of multi-superimposed CBM geologic body,which provided a visualization platform for reservoir numerical simulation of superimposed gasbearing system,and also laid a foundation for analysis of interlayer interaction of multi-layer combined production.The following is a specific work:1)This paper analysed the spatial characteristics of boreholes and reservoirs,extracted the main reservoirs data of multi-superimposed CBM system,interpolated the original point data with ordinary Kriging method to obtain the data of the whole study area,and established the 3D spatial data model and attribute data model of boreholes and reservoirs.2)According to the multi-level and multi-attribute characteristics of multi-superimposed CBM system,based on the data organization form of Surfer plain code grid file,this thesis designed an ASCII code data file organization form which can manage multi-reservoir and multi-attribute data.3)Based on the 3D modeling theory and WPF drawing principle,combined with the geometrical characteristics of the research object,this paper constructed the primitives of the 3D geological model: triangle model,needle model and cylinder model,and realized 3D visualization of reservoir surface model based on triangle,reservoir solid model based on needle and borehole model based on cylinder.At the same time,it also realized the query and visualization of reservoir attribute model according the user and data interaction functions.