Three types (i.e.single-

double-

and three-layer structures) and eleven sub-types of geologic configurations are recognized in the middle-upper Yangtze region based on the previous study and combining field tectonic profiles

seismic-geological interpretations

and drilling data.The structural zonation of the fold-thrust belts and the distribution of these geological configuration types in the study area are expounded in terms of five structural provinces and the genesis of these configuration types is briefly discussed. The differences among these geologic configuration types are closely related to the detaching depths of the major faults within deforming zones

and the latter determines the erosion of regional cap rocks and the role of faults in hydrocarbon preservation for this type of geologic configuration.Among these geologic configuration types

the stable single-layer configuration

the deep structure in the double-layer configuration and the middle structure in the three-layer configuration have excellent preservation conditions

and therefore are potential exploration targets.