Hydrocarbon Prospectivity of Surma Group in Sylhet Area in Context of Sequence Stratigraphy

This research focuses on studying the Surma Group sediments with an integrated approach of using wireline logs and 2D seismic data from Sylhet structure outcrop analogy Zaflong-Tamabil-Jaintiapur area to explain geological evolution in context sequence stratigraphic framework its implications identify hidden potential hydrocarbon traps that remains overlooked. The 'SYL-07' well divided encountered sedimentary strata by boundaries (SB) flooding surfaces (FS) into upper third-order Lowstand System Tract (3_LST), followed Highstand (3_HST), underlying Transgressive (3_TST) which correspond Tipam, Boka Bil, Bhuban formations, respectively. 3_HST has further been subdivided fourth-order sequences. Well-to-seismic ties helped identifying regional context. Three new prospects nose flank have detected based attributes log responses. Seismic sweetness attribute anomalies confirmed existence these prospects. Rigorous fieldworks provided nineteen facies seven sets associations establish sedimentological stacking patterns corresponding depositional environments. About 2250m lithocolumn constructed field revealed four system tracts roughly Renji (3_TST), Bil Tipam (3_LST) formations bottom-up order, while obtained aid sequences including 3_HST. lithologic column corresponds sections validates seismically interpreted However, high-frequency can only be correlated motif due sub-seismic resolution. erosional 3_HST, for instance, coarsening upward shoreface shelfal topped transgressive shale, yielded future drilling sites response analysis. overall evaluation prospectivity area. Dhaka University Journal Earth Environmental Sciences, Vol. 11(1), 2022: 95-110