Abstract:

Uncompacted belts were formed by abnormal high formation pressure.But this does not mean that all the present uncompacted belts are now still high pressure or superpressure belts.It has to be decided by the log of the sandstone and mudstone of the same section.If the log of the sandstone and mudstone indicates the existence of uncompaction in the same interval,it is certain that the uncompacted belt is still a high or superpressure belt;otherwise,the uncompacted belt is not high or superpressure belt.This method was used in Tarim and Qinshui Basins,the results are satisfactory.

Key words: well log data, uncompacted belt, fossil high pressure belt, present high pressure belt, example