STRUCTURAL SEISMIC INTERPRETATION INTEGRATED WITH PETROPHYSICS AND COLORED INVERSION FOR MEYAL AREA, UPPER INDUS BASIN, PAKISTAN

Abstract

This study aims for the interpretation of seismic lines, wire line logs and colored inversion for better visualization of promising zones of hydrocarbon of Meyal Area. The study area lies in Upper Indus Basin of Pakistan. The area is a part of Potwar sub-basin which is known for its hydrocarbon structural traps due to tectonic activity. Datta and Patala Formations act as source rocks, Chorgali and Sakesar Formation are the two main reservoir rocks whereas Kuldana and Murree Formations act as seal/cap rocks. Seismic data for this study consists of four seismic lines; three dip lines and one strike line. Overall interpretation of seismic lines shows pop-structure and proved presence of structural trap in area. Trace envelop, average and instantaneous phases seismic attributes are applied to aid the interpretation results and faults marking of prominent horizons. Facies analysis of Well Meyal-9P is carried out. Petro-physical analysis of well Meyal-9P for Chorgali and Sakesar Formations in order to depict the favorable zones for hydrocarbon accumulation and their reservoir characteristics, Chorgali and Sakesar formation have 92.58% and 83.50% hydrocarbons saturation respectively. Colored Inversion is used for developing the relationship between seismic data and well logs, to improve resolution and to calculate accurately rock properties. Inversion result shows low acoustic impedance which proved presence of hydrocarbons in marked horizons.