Geological Characteristics of Gas Accumulation Combination of Persian Khuff Formation in Gulf Basin
Received date: 2012-01-04
Revised date: 2012-02-21
Online published: 2012-08-10
The combination of source rock,reservoir and cap rock in the Persian Khuff Formation is the most important gas accumulation combination in the Persian Gulf basin.Both Permian Khuff carbonate and interlayer anhydrite consist in the basic elements of gas accumulation combination of Persian Khuff Formation.The Silurian Qusaiba Formation hot shale is the source rock,with wide distribution,high TOCand moderate thermal maturity at late Craterous.The time of trap formation is earlier than that of hydrocarbon generation window,and many basement faults take vertically a good passageway for hydrocarbon migration from Qusaiba hot shale to Unayzah sandstone and the Unayzah sandstone make a lateral migration passageway.The cyclically deposited anhydrite and carbonates act the good cap rock and high quality reservoir.The Khuff Formation reservoir rocks with good original property are composed of oolite,pellete,biodetritus packstone and grainstone,with good moldic pore and interparticle pore.The action of leaching and dolomitization greatly improved the reservoir pore at later stage.In most area,the faults do not make the cap rock loss the sealing,so little gas is lost.The potential area of gas exploration is in the overlay area of Qusaiba Formation mature source rock and interlayer anhydrite,including West Arabian sub-basin,central-east part of Widyan-Mesopotamia sub-basin,northwest of Persian Gulf,and southern area of Ghawar oil field.It is paid more attention in the future to identify the big traps with low closure.Additionally,for the high economy limit of exploration and development in the Middle East,the production for small hydrocarbon reservoirs need the support of high oil price.
LI Hao-wu，TONG Xiao-guang . Geological Characteristics of Gas Accumulation Combination of Persian Khuff Formation in Gulf Basin[J]. Natural Gas Geoscience, 2012 , 23(4) : 727 -735 . DOI: 10.11764/j.issn.1672-1926.2012.04.727
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