Mud gas isotope logging application for sweet spot identification in an unconventional shale gas play: A case study from Jurassic carbonate source rocks in Jafurah Basin, Saudi Arabia

The Jafurah basin is a new frontier unconventional exploration play equivalent in size to the successful Eagle Ford play in south Texas. The basin is located immediately east of the adjacent supergiant Ghawar Oil Field. The middle to upper Jurassic organic-rich mudrocks are recognized as the source...

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Bibliographic Details
Published in:Marine and petroleum geology 2016-09, Vol.76, p.133-147
Main Authors: Hakami, Ahmed, Ellis, Leroy, Al-Ramadan, Khalid, Abdelbagi, Sami
Format: Article
Language:English
Subjects:
Basins
Formations
Gas origin
Jafurah basin
Marine
Methane carbon isotopic
Mixing model
Mountains
Mud
Mud gas isotope logging (MGIL)
Natural gas
Rocks
Shale gas
Spots
Tuwaiq Mountain
Vitrinite reflectance equivalent
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Summary:The Jafurah basin is a new frontier unconventional exploration play equivalent in size to the successful Eagle Ford play in south Texas. The basin is located immediately east of the adjacent supergiant Ghawar Oil Field. The middle to upper Jurassic organic-rich mudrocks are recognized as the source of Ghawar hydrocarbons and are being extensively evaluated across the Jafurah basin for shale gas potential. These source rocks, notably the Jubaila and Tuwaiq Mountain, and to lesser extent Hanifa Formations possess excellent hydrocarbon attributes such as high total organic content (TOC), and sufficient maturity, combined with a relatively shallow burial depths, allowing for economical unconventional shale gas and shale oil exploitation. Mud gas isotope logging (MGIL) data obtained from recent exploration wells revealed important characterization potential enabling clear distinction between Tuwaiq Mountain, Hanifa and Jubaila Formation gases based on their isotopic signature. A new methane carbon isotopic maturity correlation for the main Tuwaiq Mountain source rock has been calibrated and successfully tested:VitriniteReflectanceEquivalent(Vre)=.069×δ13C1+5.13. This finding has permitted accurate maturity assessments providing identification of the best sweet spots predicted for optimal Tuwaiq Mountain production potential. Next stage lateral drilling developments will leverage MGIL technology to assess the effectiveness of future hydraulic fracturing treatments in this formation and ensure maximum in zone completions for best production potential.
ISSN:0264-8172
1873-4073
DOI:10.1016/j.marpetgeo.2016.05.003