Abstract: The follow-well track method presented in this paper is a field working method of the triode-gradient method. A large number of water-bath analog experiment results show the determination of the hydrocarbon trap short-axis boundary, while its long-axis boundary will have to be determined by the follow-well track method. and so will the equal-axis hydrocarbon trap boundary. This method can also be used in the vertical prediction of hydrocarbon trap and its development monitoring.

Key words: Triode-gradient, Follow-well track method, Analog experiment, Hydrocarbon trap exploration