Analysis of pool forming pattern and progress of Khuff Formation in UAE
Received date: 2016-10-20
Revised date: 2017-02-28
Online published: 2017-04-10
Khuff Formation of Permian is the most important gas production zone in Middle East.From 1970′s,the Khuff Formation exploration works had been carried out in UAE and few traps had been discovered.However,the exploration result is not good:all the onshore traps test are dry or with water;the offshore trap test have limited gas with lots of NHCG.It′s very difficult for the future exploration work for Khuff reservoir.Khuff reservoirs have good source,reservoir and cap.The Qusaiba hot shale is the source of Khuff reservoir;the Sudair muddy limestone and middle anhydrite in Khuff are both good cap rock for Khuff reservoir.Based on the analysis of comprehensive information,the key point of Khuff gas reservoir effectiveness is the structure development and the generation and migration of source.The pool forming pattern shows:the offshore trap was developed with salt swell in the early stage and effected by Acadian,Hercynian and Zagros structure movement in the late stage.The offshore Khuff trap kept integrated.In Jurassic,oil migrated to the offshore trap and accumulated;In Late Cretaceous,oil cracked into gas.Then the gas reservoir of offshore Khuff trap is effective.However,as the burial depth of Khuff Formation becomes more and more,more and more H2S and CO2 are generated due to TSR.The development of onshore traps began in Oligocene and was affected by Zagros structure movement.The trap formation time is later than that of the formation and migration of source,so the onshore Khuff traps have no gas.
Key words： Pool forming pattern; Khuff Formation; Structural evolution; Oil cracked gas; NHCG
Chen Jie，Zhang Jian，Fang Jie . Analysis of pool forming pattern and progress of Khuff Formation in UAE[J]. Natural Gas Geoscience, 2017 , 28(4) : 521 -528 . DOI: 10.11764/j.issn.1672-1926.2017.03.002
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