Subsurface Structural Interpretation and Petrophysical Analysis of Sanghar Area, Southern Indus Basin Pakistan

Abstract

The Southern Indus Basin of Pakistan, particularly the Sanghar area holds the significant hydrocarbon potential due to its complex structural framework and favorable stratigraphy. This study integrates seismic interpretation and petrophysical analysis to assess the subsurface geological conditions and reservoir quality of the Al-Hakeem-01 well located within the Lower Indus Basin. Seismic data was interpreted using GVERSE GeoGraphix 2022.1 that focused on horizon and fault mapping, depth conversion and the generation of structural contour maps. Key formations, including the Kirthar, Ranikot, Parh Limestone and Lower Goru were delineated. Structural features such as horst-and-graben systems were identified and indicating extensional tectonic regimes favorable for hydrocarbon entrapment. Petrophysical analysis was conducted using well log data including gamma ray, density, neutron, sonic and resistivity logs. Parameters such as shale volume, porosity and water saturation were computed to evaluate reservoir quality. The Lower Goru Formation exhibited moderate to good effective porosity 4–9% and has high hydrocarbon level, 60-70% in zone four identified as the most promising interval based on log responses. The integrated seismic and petrophysical approach provides a comprehensive evaluation of the hydrocarbon prospectivity of the Sanghar area and serves as a foundation for future exploration and development strategies within the Southern Indus Basin.