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