Abstract:
A petroleum play study is carried out to evaluate hydrocarbon potential in Mubarik exploration block, Central Indus Basin, by mapping the depositional geometries of Eocene and Cretaceous Reservoirs. Geologically the area is present in the Panu Aqil graben, with Kirthar fold belt on its West and Mari Kandkot high in east, whereas on North and South, Sulaiman fold belt and Khairpur Jacobabad high are present respectively. Six seismic lines and data of two exploratory wells are used for this purpose. All key horizons from recent stratigraphy to Jurassic age are marked to analyze basinal architecture, and to correctly describe depositional geometries of target horizons. The Sui Main Limestone of Eocene age and Lower Goru B Interval from Cretaceous age are extensively mapped and correlated by generating isochron maps. The study area underwent extension event from Cretaceous to Eocene age, forming negative flower structures. The deposition of target clastics and carbonates is effected by the presence of Paleo highs namely Khairpur Jacobabad High and Mari Kandkot high. The depositional geometries have been inferred using isochron maps generated for target reservoirs (Sui Main Limestone and Lower Goru B reservoir). The Sui Main Limestone exhibits the geometry of shallow marine shelf carbonate buildup in the study area where as the Lower Goru B Sand interval demonstrates geometry of sheet like deltas in ramp setting. The Sui Main Limestone has untapped potential in East of study area while the mapping suggest upside hydrocarbon potential of Lower Goru B Sand reservoir in North of Mubarik area. The pinch out of C Sand of Lower Goru formation holds next exploration opportunity for the Exploration and Production sector operating in Central Indus Basin.
