2D Seismic Data Interpretation and Petrophysical Analysis of Rajian Area, Upper Indus Basin, Pakistan

Abstract

This study focuses on the integrated seismic interpretation and petrophysical evaluation of the Rajian Field situated within the Pothwar Sub-Basin of the Upper Indus Basin, Pakistan. The research utilized 2D seismic data in conjunction with well logs from the Saba-01 well to delineate subsurface structures, evaluate reservoir quality and assess the hydrocarbon potential of the study area. The seismic interpretation workflow involved horizon picking across four key stratigraphic markers Murree Formation, Chorgali Formation, Lockhart Limestone and Salt Range Formation. Structural time contour maps are generated to identify the major tectonic features. Petrophysical analysis of the Saba-01 well was conducted using gamma ray, density, neutron, sonic and resistivity logs. Two hydrocarbon-bearing zones were identified within the Eocene formations, with Zone 2 (3734.92–3737.05 m) emerging as the most prospective interval. This zone exhibited favorable reservoir parameters, including average porosity (PHIA) of 22%, effective porosity (PHIE) of 15%, shale volume (Vsh) of 28%, and water saturation (SwA) of 51%, suggesting good reservoir quality with significant hydrocarbon saturation. The integration of seismic and petrophysical results provides a coherent subsurface model that confirms the Rajian Field’s hydrocarbon potential. The findings demonstrate that the area is structurally well-defined and petrophysical promising, offering valuable insights for future exploration and development strategies in the Upper Indus Basin.