Application of spectral decomposition for gas hydrate exploration: A study from Mahanadi offshore, India

Abstract

Seismic attributes have become successful in illuminating subsurface features and are widely used by interpreters for identifying potential hydrocarbon reservoirs. A case study is presented in the Mahanadi basin lying in the eastern Indian margin, where gas hydrate has been detected by identifying a bottom simulating reflector or BSR on seismic section. The data is conditioned using several post-stack processing steps such as the detailed and background steering followed by dip steered median filter (DSMF). This data is then used for extracting seismic attributes. Spectral decomposition and comparative results of different algorithms used for delineating gas hydrate and free gas underneath.