Meandering channel systems and point bars (PBRL) of the fluvial depositional system (FDPS) globally form primary stratigraphic traps (PST). These ultra-thin-bedded and sub-seismic features are developed during rising sea-levels (transgressive) and standstill (aggradational parasequences) inside the transgressive system tract (TST). The aggradational parasequences of TST have coarse-grained sandstone-filled PSTs, which have specific thickness, density, velocity, angle of the sedimentary reserves, and depositional and erosional characteristics for the development of seismic reflection configurations. All these implications are the key controlling factors for developing the aggrading parasequence sets of TST throughout a sea-level standstill, which is not feasible to predict using the full spectrum-based time and depth mapping tools. The full spectrum-based amplitude volumes lack the tuning frequency content for achieving the above-addressed implications. They require sophisticated tuned-frequency amplitudes, which are responsible to resolve these PSTs when they are filled with porous (Ps) and gas-saturated (Sgas) sedimentary facies, and hence, they show unique seismic-based expressions (velocity and density). Therefore, all these implications are achieved in this study by operating the spectral attributes and the instantaneous spectral decomposition-based velocity and density reservoir simulations (SVDRS) on a hydrocarbons-producing arena, onshore Indus, Pakistan. The tuning thickness for this FDPS was 8.75 m. The 42-Hz spectral attribute shows ∼13 m parallel and wavy seismic reflection configurations, but failed in predicting the horizontally deposited PST, simulated density and velocity, shelf or basin plain, and lateral distribution of Sgas and Ps point bars along the subsidence zones. SVDRS have predicted the ∼86–95% Sgas; ∼31–35% Ps; 14–16 m thick (on inverted density simulation); 2453–2500 m/s velocity; inside the 2.2–2.3 g/c.c densely-fractured and inclined (<3°) aggradational parasequences with parallel reflection configurations for high sinuosity index (S.I) > 2.2 PBRLs, which implicates the presence of a meandering channelized reservoir stream. These stratigraphic configurations implicate the low-risk and highly rewarding hydrocarbon prospecting zones due to no spilling out of the hydrocarbon from the PST during the sea-level standstills. These hydrocarbon-bearing PBRLs have a lateral extent of >2 km, which is an appreciable signature of velocity and densities to develop these traps as the future stratigraphic prospect. These PBRLs with >90% Sgas and >32% Ps of PST are completely embedded within the topmost and horizontal regions with transgressive shales facies (seal) of TST and low-Ps shaly-sandstones, which implicates the landward shifting of shoreline during the sea-level rising events. The uncertainty analysis for simulated velocity and density validates a strong R2>0.85% and 0.90% along the high sinuosity index (S.I.)>2.2 implicates the presence of meandering channel streams., which have implicated the presence of non-Ps and water-statured (Sw) retrogradational parasequences. This workflow has developed this FDPS into a pure stratigraphic trap, and hence, the presented scheme of exploration may serve to explore the remaining reserves from the exploration zones for global FDPS.