AL-GAILANI, MOHAMMAD, GeoDesign Limited, Kingston-upon-Thames, Surrey, United Kingdom

Abstract: Halfaya Field: A Twenty-first Century Super Giant

Halfaya Field lies in southern Iraq to the southeast of Amara and is considered as one of five super giant fields awaiting development in the new Millenium. The field consists of an elongated anticlinal domal structure with its long axis extending in the northwest-southeast direction. The size of the structure is about 30 km long by 10 km wide with a variable structural crest displacement which seems to shift in the northwest direction.. The structural closure also increases with depth and ranges from 70 m for the Tertiary reservoirs to 190 m for the Middle Cretaceous Mishrif reservoir and reaching up to 230 m for the Lower Cretaceous Ratawi reservoir.

Only five boreholes have been drilled so far in this super giant field which confirmed the presence of multiple 8 pay zones ranging in age from Miocene/Oligocene to Lower Cretaceous with API gravity for the discovered crude ranging from 21° to 31°. The present estimated total oil reserves in place for Halfaya is over 16.1 Billion Barrels of oil and 9,319,127.027 x 10⁹ cu ft of gas. This clearly places Halfaya field as one of the Super Giant fields of Iraq awaiting development in the new Millennium. 

AAPG Search and Discovery Article #90923@1999 International Conference and Exhibition, Birmingham, England