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Title: A model for migration and accumulation of hydrocarbons in the Thamama and Arab reservoirs in Abu Dhabi, U.A.E.

Abstract

The distribution of hydrocarbons in the Lower Cretaceous Thamama Group and Upper Jurassic Arab Formation in Abu Dhabi is influenced by the development of the intervening Hith anhydrites. The geochemical analysis of Thamama and Arab hydrocarbons indicate that they were generated from a common source rock: the Upper Jurassic Diyab Formation. Studies carried out on the Miocene sabkha anhydrites in the coastal flat west of Abu Dhabi supported a model for vertical migration through the Hith anhydrites under certain conditions. The established model implies that the Diyab oil and gas had migrated essentially vertically and individually which means that the oil migrated prior to the gas and their distribution is controlled by the differential sealing potential of the anhydrites at each migration phase: a Hith anhydrite bed of more than 30 feet (ft.) thick was a perfect seal for hydrocarbon migration into the Arab reservoirs. In this case, oils could not break through to the overlying Thamama group. But where the anhydride bed thicknesses dropped below 30 ft. thick, this permitted oil migration through to the overlying Thamama reservoirs during the oil generation phase in the Turonian time. At a later stage, with additional depth of burial and progressive diagenesismore » anhydrite beds as thin as 8 ft. thick became effective seals. These controlled the distribution of the gas during the gas generation phase in the Eocene time.« less

Authors:
;
Publication Date:
OSTI Identifier:
127443
Report Number(s):
CONF-950995-
Journal ID: AABUD2; ISSN 0149-1423; TRN: 95:005942-0138
Resource Type:
Journal Article
Resource Relation:
Journal Name: AAPG Bulletin; Journal Volume: 79; Journal Issue: 8; Conference: International conference and exhibition of the American Association of Petroleum Geologists, Inc.: managing change at the turn of the century, Nice (France), 10-13 Sep 1995; Other Information: PBD: Aug 1995
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; UNITED ARAB EMIRATES; PETROLEUM DEPOSITS; NATURAL GAS DEPOSITS; HYDROCARBONS; ORIGIN; GEOCHEMISTRY; MIGRATION; SOURCE ROCKS; JURASSIC PERIOD

Citation Formats

Hawas, M.F., and Takezaki, H.. A model for migration and accumulation of hydrocarbons in the Thamama and Arab reservoirs in Abu Dhabi, U.A.E.. United States: N. p., 1995. Web.
Hawas, M.F., & Takezaki, H.. A model for migration and accumulation of hydrocarbons in the Thamama and Arab reservoirs in Abu Dhabi, U.A.E.. United States.
Hawas, M.F., and Takezaki, H.. Tue . "A model for migration and accumulation of hydrocarbons in the Thamama and Arab reservoirs in Abu Dhabi, U.A.E.". United States.
@article{osti_127443,
title = {A model for migration and accumulation of hydrocarbons in the Thamama and Arab reservoirs in Abu Dhabi, U.A.E.},
author = {Hawas, M.F. and Takezaki, H.},
abstractNote = {The distribution of hydrocarbons in the Lower Cretaceous Thamama Group and Upper Jurassic Arab Formation in Abu Dhabi is influenced by the development of the intervening Hith anhydrites. The geochemical analysis of Thamama and Arab hydrocarbons indicate that they were generated from a common source rock: the Upper Jurassic Diyab Formation. Studies carried out on the Miocene sabkha anhydrites in the coastal flat west of Abu Dhabi supported a model for vertical migration through the Hith anhydrites under certain conditions. The established model implies that the Diyab oil and gas had migrated essentially vertically and individually which means that the oil migrated prior to the gas and their distribution is controlled by the differential sealing potential of the anhydrites at each migration phase: a Hith anhydrite bed of more than 30 feet (ft.) thick was a perfect seal for hydrocarbon migration into the Arab reservoirs. In this case, oils could not break through to the overlying Thamama group. But where the anhydride bed thicknesses dropped below 30 ft. thick, this permitted oil migration through to the overlying Thamama reservoirs during the oil generation phase in the Turonian time. At a later stage, with additional depth of burial and progressive diagenesis anhydrite beds as thin as 8 ft. thick became effective seals. These controlled the distribution of the gas during the gas generation phase in the Eocene time.},
doi = {},
journal = {AAPG Bulletin},
number = 8,
volume = 79,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 1995},
month = {Tue Aug 01 00:00:00 EDT 1995}
}