Lower Silurian-Upper Ordovician subsurface glacial outwash deposits, northern Saudi Arabia
- Northern Area Exploration, Dhahran (Saudi Arabia)
Recently acquired seismic data reinterpreted well information in northwest Saudi Arabia extends outcropping Lower Silurian to Upper Ordovician Zarqa/Sarah glacial and periglacial deposits into the subsurface. These deposits range from northeast-trending outwash-filled channels deeply incised into the underlying Ordovician Qasim and the Cambrian-Ordovician Saq Formation in the east. A southwest source for these sediments is implied by this new data. This supports previously interpreted source directions mapped from outcrop. It also correlates with the position of the Arabian plate relative to known Gonwanaland ice caps during the Early Silurian-Late Ordovician. The recognition of glacial outwash sediments in the subsurface provides new insight into the continuity and environments of deposition of the Qasim Formation members in northwest Saudi Arabia. The hydrocarbon-prone Lower Silurian Qusaiba Member of the Qalibah Formation overlies the Zarqa/Sarah Formations. The Qusaiba represents a rapid transgression of the Paleo-Tethys Sea during the final melting of the Gondwanaland ice caps. The seal-source characteristics of the Qusaiba Member, combined with the good porosity and permeability of the underlying outwash deposits, suggest a prospective hydrocarbon exploration play. Gas is produced from this reservoir in the Risha field of eastern Jordan.
- OSTI ID:
- 5848294
- Report Number(s):
- CONF-910978--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 75:8; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ASIA
DEPOSITION
DEVELOPING COUNTRIES
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
GEOPHYSICAL SURVEYS
ICE
ICE CAPS
MIDDLE EAST
MINERAL RESOURCES
MORAINES
NATURAL GAS DEPOSITS
ORDOVICIAN PERIOD
PALEOZOIC ERA
PETROLEUM DEPOSITS
PLATE TECTONICS
POROSITY
RESERVOIR ROCK
RESOURCES
SAUDI ARABIA
SEISMIC SURVEYS
SILURIAN PERIOD
STRATIGRAPHY
SURVEYS
TECTONICS