2D-SEISMIC REFLECTION DATA INTERPRETATION INTEGRATED WITH PERTOPHYSICAL ANALYSIS SEISMIC ATTRIBUTES AND ROCK PHYSICS MODELLING OF KHIPRO AREA, PAKISTAN

Abstract

The present study pertains to integrated seismic and petrophysical analysis of Khipro area, with special emphasis on seismic attributes and 2D rock physics modelling. The area lies in Lower Indus basin of Pakistan, is very prominent for hydrocarbon accumulation in structural traps. The work is carried out on six seismic line along with the well data (petrophysical logs). The study includes the structural interpretation of seismic data. Three horizons are marked mainly reservoirs which are identified using formation tops from well along with normal faults indicates extensional regime. Reflectors of three formations namely Middle Sands, Sand above Talhar Shale and Sand below Talhar Shale are marked on seismic section, with the help of synthetic seismogram of Naimat-Basal-01 well. Time and depth contours maps of the three horizons are generated which delineates the horst and graben structures that confirms normal faulting in the study area. Naimat-Basal-01 well is drilled on the horst in Khipro area. To confirm seismic interpretation seismic attribute analysis have been carried out to identify the lithological boundaries, discontinuities in lithologies and structural disturbance. Petrophysical analysis have been carried out for the demarcation of reservoir zone to find the hydrocarbon potential in the area, based on which three zones of interest are marked using different petrophysical logs. Low volume of shale, high effective porosity, low water saturation and high hydrocarbon saturation in zone of interest are the indicator for hydrocarbon presence and the porous reservoir formation, which is suitable for hydrocarbon accumulation, also for quantitative interpretation averages of the different petrophysical logs are calculated. Rock physics cross-sections have generated using velocity windows for formulation of velocities and physical parameters like elastic moduli, porosity and seismic density.