Basin floor fans (BFFs) of deltaic systems serve as highly potential zones for the development of shale gas systems (Shgas). These Shgas formed during extensive sea-level fall and relative rise, filling reservoirs with hydrocarbon-bearing sediments. This study executed state-of-the-art wavelet transform-based gas saturation and porosity-constrained quantitative dynamical simulations (WT–GPDSs) on a shale gas-bearing field, NNE-Indus Onshore. The 48-Hz spectral waveform amplitude imaged a 20° steeply dipping limb of the anticline. The WT–GPDSs simulated 2050 m/s velocity, 2.1 g/cc density, 68 m thickness, and 90% gas saturation for BFFs, which have a 2-km simulated lateral extent and 32% porosity, denoting the development of progradational-to-aggradational parasequence sets inside them. This implicates the vertically and laterally developed crests of anticlines, and, hence, tectonic subsidence. The WT–GPDS simulated a 3338 m/s velocity and 2.45 g/cc density for lateral seal. The WT–GPDS also simulated a density of 1.9 g/cc, a velocity of 2750 m/s, a continuous increase in sonic porosity, and a decrease in density for the BFFs, implicating the dense fracture network within the BFFs. The 2050 m/s simulated velocity and 2.1 g/cc simulated density resolved a 0° gently dipping strata of BFFs, implying low-gradient and high sinuosity index-based meandering channels sedimentary influxes for the BFFs. Low-frequency shadows at 48 Hz tuning frequency and amplitude attenuations at 55 Hz tuning frequency resolved a 63-m-thick Shgas of BFFs. This research provides fruitful opportunities for Shgas discovery within a 600-m radius of drilled Miano-08. Consequently, this study serves as an analog for exploring Shgas within NNE-Indus Onshore and global basins.