Application of maximum likelihood and model-based seismic inversion techniques: a case study from K-G basin, India

Abstract Seismic inversion is a geophysical technique used to estimate subsurface rock properties from seismic reflection data. data has band-limited nature and contains generally 10–80 Hz frequency hence combines well log information along with extract high-resolution acoustic impedance which low as high frequencies. This property qualitative quantitative of that can be analyzed enhance geological interpretation. The interpretations extracted are more meaningful provide detailed the compared traditional present study focused on analysis KG basin find prospective zone. Petrophysical parameters such effective porosity, water saturation, hydrocarbon several other were calculated using available Low Gamma-ray value, resistivity, cross-over between neutron density logs indicated presence gas-bearing zones in basin. Three main hydrocarbon-bearing identified an average value 50 API units at depth range (1918–1960 m), 58 (2116–2136 66 (2221–2245 m). resistivity found 17 Ohm-m, 10 12 Ohm-m porosity 15%, 14% zone 1, 2, 3 respectively. petrophysical different cross-plots showed reservoir sandstone shale seal rock. On hand, two types namely Maximum Likelihood Model-based impedance. inverted section interpreted anomalous very ranging 1800 m/s*g/cc 6000 quite indicates loose formation.