It is of significance for guiding exploration and development and drilling engineering of the oilfield to conduct the study on abnormal formation pressure.

Real-time lithology identification while drilling not only helps to find the oil-bearing layers, but also provides a geological basis for the abnormal formation pressure forecast.

Three dynamic systems of entrapment are divided in the Eogene of De Nan depression in terms of stratigraphic, tectonic characteristic and the vertical distribution of abnormal formation pressure.