2D Seismic Data Interpretation and Petrophysical Analysis of Bannu Area, Kohat Sub Basin, Pakistan

Abstract

The fold and thrust belt of the North West Himalayas is an active fold and thrust belt along the western margin of the Indo-Pak plate. It mainly represents three main regions i.e. Kohat Surghar Range, Potwar Salt Range and Bannu Basin - Khisor Range. Among these areas, Bannu area is the least studied and a handful amount of seismic or petrophysical data is available for interpretation purposes. The recently available public domain 2D seismic profiles and well data for Kundi-X1 in the Kohat Sub-Basin show extensive deformation in the subsurface containing numerous reverse faults associated with compressional regime in the surrounding area. For interpretation purposes, three horizons and reverse faults have been manually marked using formation tops given in the dataset. Fault correlation was performed using Kingdom 8.8 software. Time and depth contour maps were also generated to reveal the nature and geometry of the subsurface using the same software. The seismic interpretation of the acquired lines has confirmed the presence of anticlinal structures favorable for traps. Petrophysical analysis with limited log dataset available has determined that Murree Kamlial formations contain three potential reservoir zones of small intervals with significantly high water saturation i.c. around 90%