Abstract: A new principle and algorithm for 3D color mapping model of petroleum reservoir are presented.At first,the original seismic and/or well-logging data are converted into spatial grid data body by using Ordinary Kriging Method.Then several 3D visualization geometric models are built by tracing the visual faces in the grid data body,and the traced faces undergo the hidden face removal and coloring process.In this way,we can get a serial of reservoir maps of 3D geophysical parameter data.By means of these 3D color models and their corresponding maps,it is easy and convenient to recognize the geological characteristics and their distribution patterns.