Reasons of well failure in Jherruck block Lower Indus Basin, Pakistan using 2D seismic and well data

The Jherruck block is located in Lower Indus Basin in district Thatta, Sindh province, Pakistan, which is a hydrocarbon producing province. Lower Indus Basin is underlain by infra-Cambrian to Recent clastics and carbonates. On the basis of seismic data (2 dip lines and 1 strike line) and well data (well tops) subsurface structure has been interpreted. Due to extensional regime normal faulting is present in the area, various horizons and faults have been identified and marked. The proven reservoir in the region is C-Sand which is also present in Jherruck block and has been interpreted. The interpretation of composite lines shows that Jherruck-B1 well has targeted the C-Sand horizon, as a targeted reservoir at a depth of 2454m which undergone gas-water contact level due to which the well had discovery and flowed for a day or more and then flowed water unexpectedly which is because the well was drilled in the gas water contact level, which is below 82 m from proposed well location as according to time and depth contour map closure and seismic composite line, hence this study suggests that the Jherruck block may have the potential to produce hydrocarbons but C-Sand should be targeted on the place where there is a closure present (at shallower depth), as there is a high probability of success rate.