Abstract
The interpretation of petrophysical logs unveil the reservoir traits and augment an intuition of hydrocarbon (gas) bearing zones. This study focused on interpretation of petrophysical signatures (encountered in Kadanwari-01, 03, 10 and 11) of Lower Goru Formation (LGF). LGF composed of shoreface sands and near shelf shale, deposited in Cretaceous age in middle and lower Indus basins, Pakistan. The results upshot the reservoir potential tapped in interbeded sand packages of LGF. The petrophysical attributes such as shale content from radioactivity tools (GR, SGR), effective porosity from NPHI-RHOB response and average porosity, derived fluids saturation of porous sand reservoir pockets by averaging, the Wyllie–Rose permeability of the selected producing zones and matching of respective resistivity responses (LLD, LLS) quantified in LGF. Lithology indicator (M–N plots) and mineral identification (MID) plot provide a basis to classify the lithology of potential sands derived by neutron, density and sonic logs. The isoperimetric surfaces depict the spatial distribution of derived results of the corresponding prospect zone (PZ). A correlation from NE to SW of study area yields a lateral profile of physical characters and distribution of PZs. Prospect Zone-3 results exhibit good quality of reservoir sands (30–37 m thick), characterizing {phi }_{text{ND}} from 0.12 to 0.23 and Shc 0.36–0.6. PZ-3 and PZ-4 are evaluated best prospect zones in this study and may be recommended for drilling.
Highlights
Pakistan’s discovered gas fields are speedily depleting resources (Shar et al 2017)
This study primarily focuses on the petrophysical assessment of Lower Goru Formation (LGF) up to 10’s of meter depth scale and presents detailed characterization of prospect zones
The comprehensive presentation upshots semi-quantitative and qualitative interpretation of petrophysical logs made with an aim to evaluate petrophysical faculties of targeted Lower Goru Sand Packages (LGSP) as reservoir of the proposed prospect zones
Summary
Pakistan’s discovered gas fields are speedily depleting resources (Shar et al 2017). The Kadanwari gas field (Fig. 1) is located in gas prone Middle Indus Basin (MIB) of Pakistan. This gas field discovered in 1989 (Kadanwari-01, discovery well) and several successful discoveries from conventional structural traps in early Cretaceous lower Goru sands convince the geoscientists for further exploration and development (Ahmad et al 2004). Eleven wells have been drilled in this studied gas field (Ahmad and Chaudhry 2002). Verbal communication with industry personal (ENI, Pakistan) reported 40 wells have been drilled in the concession block. The literature review of MIB suggests that a significant amount of untapped potential can be unearthed from structural and stratigraphic fairways of virgin plays in
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