In this study, sandstones of the Lower Jurassic Datta Formation in the Salt and Trans- Indus ranges are investigated regarding composition, diagenesis, prov- enance and reservoir properties using petrography, scanning electron micros- copy and petrophysical analysis. The detrital mineral composition of the Datta Formation indicated that the sandstones are quartzose, lithic-quartzose, lithic- feldspatho- quartzose, lithic- quartzo- feldspathic, quartzo- lithic and feldspatho- quartzose, primarily from the recycled orogen setting, including the Malani Igneous Suite, the Aravali Range and Nagar Parkar. The Datta Formation has sub-angular to well-rounded, fine to coarse and moderate to well-sorted grains. Numerous diagnostic processes that occurred in the early to late stages of di- agenesis, such as compaction, pressure solution, cementation, alteration, dolo- mitisation and dissolution, are supported by evidence in the Datta Formation. Dissolution, physical compaction, dolomitisation and alteration enhanced the reservoir quality, while pressure solution and cementation reduced the reservoir quality of the Datta Formation. The porosity types detected in the Datta Formationunder scanning electron microscopy are vuggy, intracrystalline/intraparticle, dis-solution and intercrystalline, with an average petrographic visual porosity of 11%.The petrophysical aspects of the Datta Formation in the Chonai- 01 well and thecorrelation between four wells indicated that the hydrocarbons had shifted up-dip towards the Isa-Khail-01 well, so it is recommended for drilling because ofthe greater depositional thickness. The comparison of the Datta Formation withage- equivalent units in other regions of eastern Tethys provided a better under-standing of reservoir heterogeneities that can be applicable in areas with similargeological conditions for future petroleum exploration.