2D seismic data interpretation and 3D structural evaluation of Dhulain area, Potwar, Pakistan (P-1099) (MFN 3917)

Abstract

Dhulian is located in the Central Potwar Zone and is broad east-west trending, doubly plunging anticline. The aim of the study is to identify structures present in the area of Dhulian through the interpretation of the Seismic data. A total number of four seismic lines PDK-102, PDK-103, PDK-104 and PDK-113, well logs of Dhulian-43 and a base map were provided by Directorate General of Petroleum Concession (DGPC) from a Seismic survey conducted by O.G.D.C. in 1981 in the area of Dhulian. Four prominent reflectors R1 (Chorgali Formation), R2 (Sakesar Formation), R3 (Lockhart Formation) and R4 (Dandot Formation) are marked on the Seismic sections and mapped. Two way travel time for each reflector was calculated and the average velocity for each line was calculated by using Mean Line Method. Time, velocity and depth contour maps were made for the four horizons. These contour maps show a faulted anticline subsurface structure favorable for hydrocarbon accumulation. Seismic sections, representing seismic structures in terms of depth were prepared for the line PDK-104 and PDK-113 by using depth of horizons picked and formation thicknesses encountered in well Dhulian-43.