The present study aims to improve knowledge of the structure of the Bilma block based on the interpretation of gravity anomaly maps. Three filtering methods were applied: upward continuation, horizontal gradient and Euler deconvolution. The analysis of the residual anomaly map upwarded allowed us to understand the behavior of gravity anomalies at the different applied altitudes. The negative anomalies thus resist to the various continuations, unlike the positive ones anomalies. The horizontal gradient method also allowed us to identify and highlight gravity lineaments that may be associated with faults already recognized by geological and geophysical studies. Those faults are responsible for the structuration of the Bilma block and are organized into three families of directions: NW-SE, NNW-SSE and NE-SW, with a prevalence of the NW-SE direction. Finally, the estimated depths by using Euler deconvolution calculations exceed 3 km for the deepest density sources and they are less than 1 km for the shallower ones sources.