Stratigraphic and structural effects on cretaceous formations produced by regional Paleo-Highs in the Middle Indus Basin, Pakistan (T-1542) (MFN 6273)

Abstract

Indus basin is usually subdivided into sub-basins by the help of regional positive features called paleo-highs In the Middle Indus Basin, these highs provide some magnificent stratigraphic entrapment geometry especially in the area between two regional paleo highs. Current study focuses on the Cretaceous deposition with reference to the regional highs. Investigation encompassing the effect of these regional positive structures on the depositional architecture of the Cretaceous formations has received very less attention. By applying the means of gravity, seismic and wells data, a depositional history of the Cretaceous strata is established, which was integral part of current research. Stratigraphic interpretation is conducted on welltied regional transects using a chronostratigraphic framework. Chronostratigraphic chart is constructed to get an idea about the spatial and time deposition of Cretaceous strata in the area. These charts delineated the presence and absence of certain sequences on the regional highs. Hence constraining the timing of major uplift events. Current study allowed to create a schematic models explaining the regional uplift of the Jacobabad high. It is concluded that Cretaceous deposition was largely un-effected by the major uplifting events in the area, rather a structural dip was provided by the later structural uplift of the area.