GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 3.1 394 Conclusions Occurrence of kerogen in source rocks can be detected qualitatively with several geophysical methods: compressional impedance inversion, AVO, seismic frequency attributes. Quantitative estimation of TOC content can presently be done only using compressional impedance by inversion. A method for inverting impedance from seismic data where well impedance is replaced by rock physics constraints has been developed with promising results. Ambiguity still exists in establishing a relationship between TOC content and compressional impedance, since very few data have been published about the acoustic and viscoelastic properties of kerogen. Acknowledgements The authors thank Eni management for allowing the publication of this work. They also acknowledge the contributions of A. Amato Del Monte, E. Antonielli, G. Luchetti, E. Paparozzi, L. Bianchin. References Amato del Monte A., Antonielli E., De Tomasi V., Luchetti G., Paparozzi E., Gambacorta G.; 2018: Methods for source rock identification on seismic data: An example from the Tanezzuft Formation (Tunisia). Marine and Petroleum Geology, 91, 108-124. Carcione, J.M.; 2000: A model for seismic velocity and attenuation in petroleum source rocks. Geophysics 65, 1080–1092. De Tomasi, V., 2016. On the estimation of the apparent oscillation frequency of a time series. In: SIMAI XIII Biannual Conference, Milano, pp. 368–372. Løseth, H., Wensaas, L., Gading, M., Duffaut, K., Springer, M.; 2011: Can hydrocarbon source rocks be identified on seismic data? Geology 39, 1167–1170. Taner, M.T., Koehler, F., Sheriff, R.E.; 1979: Complex seismic trace analysis. Geophysics 44, 1041–1063. Yan, F., Han, D.; 2013: Measurement of elastic properties of kerogen. SEG Houston 2013 Annual Meeting, pp. 2778–2782. Corresponding author: vittorio.detomasi@eni.com Fig. 3 - Comparison between seismic impedance inverted replacing well log impedance with constraints (left) and well-constrained inversion (right).