Abstract:
Seismic sequence stratigraphy has completely revolutionized the field of
stratigraphy as it has led to the introduction of new ways for the purposes of correlation
and mapping of sedimentary rocks. The area under study is Missa Keswal oil field which
is located ten kilometres from Gujar Khan in Rawalpindi District of Punjab and it is about
70 kilometers SSE of Islamabad. This area has undergone compression and pop up
anticlinal structure was interpreted. Stratigraphically this area lies in Potwar sub basin
Pakistan which is very well known for its complex geological features. A tentative model
explaining Sequence stratigraphic framework of area was developed using wireline logs
and seismic lines. Focus of research was on Permian and Cambrian aged Formations.
Depositional model 3 and Genetic model were used as base. Both the Cambrian and
Permian aged Formations fall in second order of cyclicity. Trends of Gamma ray log aided
in identification of depositional environments of Formations. Two Type 1 Sequence
boundaries have been identified and marked on top of Khewra Sandstone and top of Tobra
Formation respectively. Three MFS were identified in Kussak Formation, one MFS in
Dandot Formation and three clinoformal geometries in Jutana Dolomite were observed.
Owing to the poor quality and resolution of data, truncations and geometries were merged
in reflections and therefore limited translation of sequential model was possible. Downlap
in Khewra Sandstone, incision in Baghanwala Formation in Rajian-01 well and thinning
of data towards Eastern Salt Range in Missa Keswal-01 and 03 was observed.
