Abstract: Quantitative characterization and prediction of distribution and property of oil-gas reservoirs from 3D geological modeling have become main aspects for petroleum exploration and development. In 2001,Karamay formation of Well Block J-131 in District 4-(2), Karamay oilfield entered into rolling development. With aid of advanced Fast Tracker geological modeling software, and based on the previous reservoir description results, visual and intuitionistic 3D structural model, lithologic model and model for porosity-permeability-saturation and resistivity attribute have been developed in this stage. During the implementation of drilling, making use of the real-time updating functions of Fast Tracker, and replenishing new wells data, the accuracy of these modeling has been improved. In addition, using Monte-Carlo method for risk evaluation/estimation, prediction of favorable oil-bearing area in Lower Karamay formation is made, which can be as a guide for this rolling development.

Key words: Karamay oilfield, oilfield development, reservoir description, reservoir rock, model, prediction