Abstract:
Missa Kaswal Gas Field is in the Chakwal district of Pakistan. This is one of the most active oil & gas production regions. Missa Kaswal Oil and Gas Field is located at a distance of about 60 Km in the South-East of Islamabad in the eastern part of Potwar basin. On surface; it is a thrust bounded anticline striking in SW-NE direction. First seismic work was carried out in 1980, followed by drilling of an unsuccessful well. Another well was drilled after an improved seismic programme which resulted in discovery of oil and gas in seven different reservoir units of Cambrian, Permian, Paleocene, Eocene and Miocene age. Among these, three reservoir units namely Jutana, Baganwala and Kussak of Cambarian age had never produced in the Potwar basin earlier. The field had original, in place, proven reserves of 37.650 MMSTB of oil and 27.900 BSCF of gas. Current production from three wells is around 4500 barrels of oil and 7.3 MMSCFD of gas a day. This production comes from fractured limestone and porous sandstone rocks. Structure is bounded by a main thrust fault in the strike direction. Few orthognal faults exist which may provide lateral barriers to the flow during production. Probably upward migration of oil from the underthrusted block of the duplex has contributed to the occurrence of a multi-reservoir system in the upper block. Coordinates: 33° 12' 0" North, 73° 22' 0" East. The basic objective of the study is to get preliminary understanding and know how of the subsurface structure trend and stratigraphy of the cited area is formed. Seismic interpretation eventually resulted in outcomes as time and depth contour maps, which assisted in understanding the subsurface structure for further explanation.
