2D seismic interpretation of Sawan gas field integrated with petrophysical analysis: A case study from Lower Indus Basin, Pakistan

Abstract

The Lower Indus Basin is the leading hydrocarbon-bearing sedimentary basin in Pakistan. This study has been conducted on the Sawan gas field located in the Lower Indus Basin, adjacent to a few other well-known gas fields of Pakistan like Kadanwari, Qadirpur, and Miano gas fields. This research aims to present the spatial distribution and reservoir potential of the productive zones of the Lower Goru Formation. The present study utilized various two-dimensional (2D) seismic lines and well-log data (Sawan-01 and Sawan-02) to investigate the structural and stratigraphic features of the area. The stratigraphic layers are mildly deepening in the southeast direction. The 2D seismic interpretation of the research area identifies the existence of extensional remanents, i.e., normal faults. These extensional structures are associated with horst and graben geometry that acts as a trapping mechanism for hydrocarbons. Wireline logs are used to identify the reservoir's diverse lithology and petrophysical properties. Petrophysical results indicate fair to good effective porosities, low shale volume, and high hydrocarbon saturation (>55%), signifying good reservoir potential in C interval of the Lower Goru Formation.

Keywords

• Sawan
• Seismic
• Well-logs
• Goru formation
• Cretaceous
• Petrophysics