Seismic Reservoir Characterization Using Model Based Post-stack Seismic Inversion: In Case of Fenchuganj Gas Field, Bangladesh

Abstract

In the study, model based post-stack inversion technique was used to create pseudo logs at each seismic trace at the well location to constitute high resolution acoustic inverted impedance models. Interpretation of GR log, SP log, Caliper log, and seven sand bodies were marked as reservoir zones in well FG #X, which were identified as a hydrocarbon bearing reservoir. All of predicted gases bearing zones in the well FG #X show the low acoustic impedance (AI) values in inverted section analogous with the calculated AI value of logging data. The impedance value in an inverted section during 1660-1980 ms represents an image of the alteration of thin sand and a thick shale layer of Upper Bhubon formation. By observing the relatively lower AI values in the inverted section three locations have marked as additional well locations (PW 1, PW 2 and PW 3), which are more prospective for optimizing the gas recovery from this field.