**Abstract**

Gravity survey and interpretations play a very vital role more especially in petroleum prospecting. Spectral analysis of gravity anomaly has been successful in the estimation of sedimentary basement. Spectral analysis technique can be used in designing filter for the residual and region separation of complete Bouguer anomaly. The residual gravity anomaly which is of prime importance for applied geophysicists interested in the subsurface features is considered most useful for the interpretation of sedimentary basin. In this chapter, interpretation of the complete Bouguer gravity anomaly, the importance of the separation of the Bouguer gravity anomaly into its residual and regional component is presented. The residual component is considered for the application of the spectral analysis approach.

**Keywords:** gravity anomaly, regional/residual anomaly, spectral analysis, sedimentary basement, basement estimation
