The EBANO Oilfield in Mexico is dominated by the fracture-pore limestone reservoir，and the fracture is an important factor affecting oil well productivity and the water-cut rising mode. The development mechanism，influencing factors and connectivity between fractures in the thin interbeds of argillaceous limestone and calcareous mudstone in the EBANO Oilfield are studied by analyzing core and imaging logging data，drilling data，PLT test data and seismic coherence technology to improve the understanding of fracture connectivity between Ksf and Kan layers. Results indicate that this oilfield is controlled by high-angle structural fractures with the density of generally 1-2 fractures/m and 12 fractures/m to the highest，and fracture development is affected by lithology，faults，lithological association and reservoir heterogeneity. Besides，the lithology of EBANO Oilfield can be divided into three modes of association. The interbeds of argillaceous limestone with a single layer thickness of 2-4 m and calcareous mudstone with a single layer thickness of less than 1 m are favorable conditions for emerging fractures，and the fracture connectivity between Ksf and Kan layers can be divided into three types.The research results provide guidance for the development of different fractures in the oilfield. From 2013 to 2014，the drilling success rate increased from 92% to 97%. In 2020，the single well initial production of new wells will be enhanced to 167%.