Abstract:
The purpose of this study is to apply reservoir rock physics fundamentals for
understanding the reservoir architecture for hydrocarbon potential. Sui Main Limestone
is the main producer of gas in Qadirpur Gas-field area; hence most of the wells were
bottomed up to this Formation. The research area lies administratively in Ghotki and
Jacobabad districts of Sindh Province. This block is situated in the Central Indus Basin,
bounded by the Indian Plate marginal zone in the west, Sargodha high in the north, Sukkar
Rift in the south, and Indian Shield in the east. The basin is isolated by the Sargodha High
and Pezu Uplift in the north from the Upper Indus Basin. Qadirpur field is comprised of
three reservoirs, Sui Main Limestone (SML) and Sui Upper Limestone (SUL) of lower
Eocene age and the Habib Rahi Limestone of Middle Eocene age. In the Lower Indus
Basin, Paleocene and Eocene sediments record a period of sustained and widespread
carbonate deposition of shallow water surfaces. Eocene period carbonates Habib Rahi,
Sui Main Limestone and Cretaceous period clastics lower Goru Sandstone are the primary
reservoir forming in the study region. The effective porosity for both wells (Qadipur-03
& 14) ranged from 13.4% and to about 21.7% with a water saturation ranging from 32.7%
to 31%. Cross plots generated from petrophysical parameters confirms that’s majority of
values fall adjacent to the limestone and dolomite boundary which confirms the
abundance of carbonates. Petrophysical analysis concluded that Sui main Limestone is
acting as reservoir rock in both wells. Correlation of Sui main limestone shows the lateral
width of Qadirpur 14 is more as compare to Qadirpur-03 well.
