## 5 Conclusions  
By the harmonic extrapolation of the Inas Field seismic reflectivity spectrum, we have demonstrated the recovery of the original earth's reflectivity spectrum usually zeroed out by the wavelets. Based on the new insights drawn from the results of this research, we hereby conclude that  
1. it is possible to recover the earth's reflectivity spectrum from the seismic data by harmonically extending the bandwidth of the data spectrum, because wavelet deconvolution allows the retention of local transient signal characteristics beyond the capabilities of the infinite harmonic basis functions;
2. to correctly resolve the thin geologic features, the amplitude magnitude is diminished according to the thinness of the feature., thereby removing the effects of destructive interference that projects incorrect amplitudes;3. the harmonic bandwidth extension technique significantly improved the resolutions of the input seismic data and revealed subtle geologic features such as meandering channels, crevasse splay, oxbow lakes, chute-cut, point bars, barrier bar, alluvial fan, and other lagoon elements, thereby suggesting the applicability of this method for detailed stratigraphic studies. It is important to note that the results presented in this research are based on the application of this method in Inas Field, Offshore, Northern Malay Basin, and may vary in other geologic settings. Therefore, a further test of this technique in other basins is highly recommended. Applications:  
1. This technique can be applied to investigate the connectivity, continuity, and individuality of reservoir facies, since it enables the imaging of subtle geologic details [39]. 2. The authors of [39] demonstrated that the geostatistical inversion of broadband seismic data can give an accurate prediction of facies extent in a hydrocarbon reservoir. The findings of [62] also revealed that the amount of CO\({}_{2}\) storage and enhanced oil recovery is dependent on the pore size distribution, which is indirectly dependent on the reservoir rock facies. Hence, a broadband seismic obtained through the techniques presented in this research can be applied to predict the extent of reservoir rock facies, in an unconventional CO\({}_{2}\) storage [63; 64; 65]. Further Research:  
1. It is unclear whether reducing amplitude magnitudes influences the response of thick beds, or whether this technique affects how amplitude varies with offset (AVO) and other attributes, especially in hydrocarbon reservoirs. Therefore, the authors suggest that more research be done to see how this technique impacts seismic attributes. 2. The fact that this technique requires a lot of time, space, and processor speed to run is a disadvantage; however, future research can work on lowering the processing needs. The Conceptualization, methodology, formal analysis, data curation, and the original draft preparation of this manuscript were done by B.O.N., whereas the review and editing, validation, supervision, project administration, and funding acquisition, were done by M.H. All authors have read and agreed to the published version of the manuscript. This research was funded by Yayasan Universiti Teknologi PETRONAS (YUTP), grant number: 015 LC0-414. The Conceptualization, methodology, formal analysis, data curation, and the original draft preparation of this manuscript were done by B.O.N., whereas the review and editing, validation, supervision, project administration, and funding acquisition, were done by M.H. All authors have read and agreed to the published version of the manuscript. This research was funded by Yayasan Universiti Teknologi PETRONAS (YUTP), grant number: 015 LC0-414. The authors are glad to express their profound appreciation to PETRONAS for providing the data used for this study. Our gratitude also goes to Lumina Geophysical Houston, CGG, and Schlumberger for their immense contribution towards the success of this work by giving us a free license to their software, which was used on different occasions to achieve the results presented in this research.