Abstract: There are a few drilling holes in the Panyu B Sub-sag and the quality of 3D seismic data are constrained by the Paleogene sand deposits. All of these resulted in the lack of in-depth understanding of the Paleogene geology there, such as sedimentary facies, provenance and near-borehole structures, etc. In view of its excellent performance in solving various geological problems, FMI logging technology was utilized to this region for the first time. Based on FMI data, four achievements are gained: (1) Lithology, sedimentary structures and sedimentary environments are accurately recognized and classified for the Enping, Zhuhai and Zhujiang Formations; (2) Many micro faults, resistive fractures and conductive fractures are identified in the Paleogene; (3) The dip direction of cross beddings are measured; (4) The direction of present maximum horizontal principal stress is acquired. It is further inferred that (1) The interpreted micro faults and fractures from FMI images may act as the paths for vertical migration of oil and gas, and are thus beneficial for oil and gas accumulation; (2) The Paleogene strata have good porosity and permeability even under great buried depth. In a word, owe to the successful application of the FMI logging, fruitful results and helpful inferences are acquired. The findings of this research will greatly mitigate the risks in oil and gas exploration in the region.