Abstract:
OGDCL discovered the basal oil field in 1999 is an exclusive Development and Production Lease of Oil and Gas Development Corporation. It lies in Attock district and situated about 77 km Northwest of Islamabad. Basal oil field lies in Basal block bounded by latitudes 33֯ 28’ 39” N to 72֯ 11’ 40” E. 2-D seismic survey was done in the area in 1999. Main emphasis of this work is the application of 2-D structural analysis based on integrated techniques of seismic , well log and rock physics analysis in Basal area, Pakistan. LMKR provided the seismic reflection data of the study area and well logs of Garhi-X-01 well with the prior approval from the Directorate General of Petroleum Concession (DGPC) Pakistan. On given seismic lines, seismic data interpretation has been done by marking reservoir horizons of Chorgali Formation, Sakesar Limestone, Nammal Formation, Patala Formation and Lockhart Limestone by using formation tops. Structural interpretation of the area is done after making time and depth contours by picking time and their time to depth conversions. Rock physics analysis and geoseismic section was drawn to understand the lithological character and Possible hydrocarbon zones in Lockhart Limestone has been marked by viewing neutron-density cross-over. By using different log formulae, petrophysical analysis has been done for the of Lockhart Limestone. Graphs of pay zone made easy to interpret the hydrocarbon prospect of Chorgali and Lockhart Limestones. Results of seismic and petrophysical analysis, pop-up anticlinal structure is formed in the study area and there is one pay zone in Lockhart Limestone of Garhi-X-01 well.
