油藏数值模拟中复杂等值线图的绘制方法研究

Charting Method of Complex Contour in Reservoir Simulation

等值图是油藏数模软件前后处理程序包的一个重要表示方法。为了开发高效、实用的等值图程序模块,提出了一套完整的绘制复杂等值线图的方法。该方法利用三角单元法确定等值点,通过逐点比较进行等值线追踪,利用二次B样条方法光滑等值线,利用投影方法判断等值线是否与断层相交,并给出了确定等值点和绘制等值线时对断层和内外边界的处理方法以及对散点数据网格化的两种办法,即趋势面分析方法和距离加权平均的方法。该套方法既可以处理不规则边界,又可以处理断层和散点数据,可以满足油藏数值模拟中复杂等值线图的绘制要求。它对于实现高质量的油藏数模前后处理程序包具有重要实用意义。

The contour chart is an important expression method for pre - and post -processor of reservoir simulator. In order to develop a high - performance and practical contour charting module, a complete set of charting method of complex contour is presented. It adopts triangle element to determine equivalent points, point - to - point com- parison to trace the contour, B - spline to smooth the contour, and projection to judge the cross reference with faults. Treatment of faults and boundaries, grid generation of scatter point data, including trend surface analysis and distance - weighted average, are described. This set of method is capable of handling irregular boundaries, faults and scatter point data and meeting requirements of reservoir simulation. It is significant for realizing high - quality pre - and post - processors of reservoir simulator.