Abstract:
Microfacies analysis of limestone of Gaj Formation (Early Miocene) was made to assess its source/reservoir potential. In the Cape Monze area, the Gaj Formation predominantly consists of yellowish - brown sandstone and cream colored or pinkish - white argillaceous limestone. The thickness of Gaj Formation increases from northeast to southwest. Cape Monze anticline is a typical large size fold located west of Karachi. Towards southwest, it is bounded by a thrust. Oligocene and Miocene rocks are exposed at the surface with very limited exposures of Eocene rocks in the core. Petrographic analysis of Gaj limestone revealed that they are comprised of bioclastic wackestone / packstone with diverse organisms, feacal and other pellets and quartz grains. The facies interpreted as shallow marine with open circulation changing upwards into shelf to slope. Facies changes existed in thick bends of limestone of Gaj Formation, despite continuous shallow marine environment, which is due to the cyclic sea level changes. The texture and facies revealed that limestone might serve as source as well as the reservoir in the offshore area south of Cape Monze anticline.
Page(s):
485-493
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2004