2D seismic data interpretation and petrophysical analysis for the evaluation and prospect generation of the Fimkassar area, upper Indus basin, Pakistan (P-1088) (MFN 3991)

Abstract

Migrated seismic lines 884-FMK-104, 884-FMK-106, 884-FMK-107, and 884- FMK-108 of Fimkasar area and Well Logs of well Turkwal Deep 1 of the Potwar foreland basin were obtained from Directorate General of Petroleum Concessions (DGPC), Islamabad for seismic interpretation and petrophysical evaluation respectively. Seismic lines 884-FMK-108 and 884-FMK-107, and seismic lines 884-FMK-104 and 884-FMK-106 are oriented NW to SE and SE to NW respectively. The velocity information required was given within the seismic sections that helped in the conversion of the time sections into depth sections. These calculations helped in the subsurface structural interpretation of the area, which was the basic purpose of this project. Two reflectors R1 and R2 were marked that were the Chorgali Formation (Top Eocene), and the Sakesar Limestone. Thrust faults were marked, and then time contour maps were generated. Time sections were converted into depth sections with the help of average velocity and finally depth contour maps were generated to know the basic mechanism of the tectonic movement in the area. The major causes have been the thrust faults that evoked from the basement salt movement to form anticlines. Hydrocarbon traps were most possibly developed in these anticlines and are the prospective zones for hydrocarbon accumulation in the Fimkasar area. Petrophysical evaluation of well Turkwal Deep 1 was carried out to highlight the reservoir area which included the selection of zone of interest followed by Log interpretation. The volume of shale, porosity, saturation of water, and hydrocarbon saturation were interpreted. On the basis of petrophysical evaluation it was noted that the reservoir of Eocene (Chorgali Formation and Sakesar Limestone) bear good porosity no hydrocarbons.