Abstract:
Pakistan occupies a total onshore and offshore sedimentary area of about 828,800 square kilometers. It represents the most extensive active collision region in the world. Its sedimentary exposures and geological structures have attracted geologist for over hundred years. Petroleum exploration in Pakistan is 120 years old and the first commercial discovery dates back to 1914. The regional tectonics and geology of country have been discussed by Wynne (1975), Oldham (1890), Vredenburg (1906), Gill (1952), Pinfold (1953), Wadia (1957), Williams (1959) Krishnan (1960), Hunting survey corporation (1961), Rahman (1963) Back and Jackson (1964), Shah (1977), White (1979), Ganser (1981), Kazmi and Rana (1982), Raza and Alam (1983) etc.
One well of Gas field from central pakistan was selected for the Petrophysical analysis and formation evaluation The XYZ field is located in Balochistan province. The structure is gas bearing in clastics of Paleocene and Upper Cretaceous age. Gas from different reservoirs contains 10% to 46% Methane and 55% to 85% Nitrogen.
Potwar Basin is one of the oldest area explored for petroleum in the world while first commercial oil discovery was made in 1914 which was the first of South Asian sub-Continent. Since then Potwar is the main source of hydrocarbons and about 25 wells of crude oils and condensates are explored in the Potwar Basin. Petroleum reservoirs containing significant amount of hydrocarbons in range of medium to high density oils (Table 2.1) have been found in the small area of the Potwar Basin and causes of the vast diversity in physical characteristics of crude oils are unknown so for.
