2D Seismic Interpretation And Structural Delineation Of Mianwali Area, Upper Indus Basin, Pakistan

Abstract

The main purpose of this dissertation is to evaluate the structure and hydrocarbon potential using seismic and well-log data of the Isa Khel area (Mianwali), Upper Indus basin, northwestern Punjab, Pakistan. The upper Indus basin is a compressional tectonic regime exhibiting reverse faulting. The area is bounded by the Sirghar range in the north and west; the Kalabagh thrust in the east, the Salt range thrust in the southeast, and the Khisor range in the south. The area follows the geology of the Nammal Gorge. The targeted formations ranged from the late Permian to the early Jurassic. For structural enhancement, five migrated seismic lines were used; 915-MWI-82, 915-MWI-100 and 905-MWI-71 (dip lines), 905-MWI-64 and 905-MWI-69 (strike lines). Time and depth contours of three horizons, Samana Suk formation, Datta formation, and Wargal limestone were generated which confirmed the anticlinal pop-up structures in the subsurface. Mechanical properties calculated through rock physics also provide support to the probability of potential zones at the level of Samana Suk and Datta formation. Although potential reservoir zones were marked, hydrocarbon potential cannot be known due to the lack of availability of complete log data of Isa Khel – 01. Time and depth sections confirm low relief anticline structure formed by four-way fault closure. Elastic moduli calculated through rock physics also provide ample support to the delineated structure, although the presence of fluid is not confirmed at any level of the target horizon. Although potential reservoir zones were marked, hydrocarbon potential cannot be known due to the lack of availability of complete log data of Isa Khel – 01