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You searched for +publisher:"Virginia Tech" +contributor:("Al-Tawil, Aus"). Showing records 1 – 3 of 3 total matches.

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Virginia Tech

1. Altemimi, Khalaf O. Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia.

Degree: PhD, Geosciences, 2012, Virginia Tech

Thirty cores from the Late Jurassic uppermost Jubaila, Arab-D reservoir and Arab-D anhydrite in Hawiyah (Ghawar) and Harmaliyah fields, eastern Saudi Arabia were studied to document the detailed facies stacking and high resolution sequence stratigraphy. The Jubaila-Arab-D interval is a shallowing upward succession of two composite sequences, in which the Arab-D reservoir and overlying anhydrite have up to twelve higher frequency sequences. Both fields are strikingly similar in terms of facies, parasequences, and vertical stacking of facies. The direction of the progrodaion is east and northeast and that is supported by northeast thickening of the Arab-D reservoir and by the stromatoporoid and Cladocoropsis facies progrodation. This suggests that the Arab-D reservoirs in both fields may represent part of a single carbonate ramp with subtle syndepositional highs. The scarcity of exposure surfaces with caliche in the Arab-D reflects the relatively high subsidence rate (~6 cm/k.y.) relative to the small sea level oscillations that formed the succession coupled with the long term shallowing trend up through the section. Dolomites from the Arab-D reservoir zones 1 to 4, in both fields were studied to better understand their origin. The dolomites are dominantly fabric destructive medium to coarse grained types, and much less common fabric retentive finer grained dolomites in the uppermost Arab-D reservoir. The δ¹³C values are rock buffered while the δ¹⁸O values have been greatly shifted toward negative values relative to unaltered early dolomite, and dolomite crystal rims generally have lighter δ¹⁸O values than cores. The dolomites were initiated at different times during shallowing phases on the Arab-D platform, with the bulk of the fabric destructive dolomites forming under near normal salinities, while the fabric preserving dolomites formed as a result of dolomitizing aragonitic sediments from more evaporated waters. With increasing burial and increasing temperature, the early dolomites re-equilibrated with the increasingly warm basinal brines resulting in replacement of cores, and dolomite cementation by rim overgrowth. Progressive plugging of higher dolomites earlier, caused some of these to retain slightly heavier δ¹⁸O values and marine seawater Sr isotope values while those that remained permeable developed very light δ¹⁸O values and more radiogenic Sr values, shifting them toward the field of late stage baroque dolomite. Advisors/Committee Members: Read, James Fredrick (committeechair), Al-Tawil, Aus (committee member), Bodnar, Robert J. (committee member), Eriksson, Kenneth A. (committee member).

Subjects/Keywords: Dolomitization; Late Jurassic; Arab-D; Sequence Stratigraphy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Altemimi, K. O. (2012). Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77079

Chicago Manual of Style (16th Edition):

Altemimi, Khalaf O. “Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia.” 2012. Doctoral Dissertation, Virginia Tech. Accessed April 08, 2020. http://hdl.handle.net/10919/77079.

MLA Handbook (7th Edition):

Altemimi, Khalaf O. “Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia.” 2012. Web. 08 Apr 2020.

Vancouver:

Altemimi KO. Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2020 Apr 08]. Available from: http://hdl.handle.net/10919/77079.

Council of Science Editors:

Altemimi KO. Sequence Development and Dolomitization of a Late Jurassic Giant Oil Reservoir, Arab-D Reservoir, Hawiyah (GHAWAR) and Harmaliyah Fields, Saudi Arabia. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/77079


Virginia Tech

2. Alkhaldi, Fawwaz Muhammad. Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia.

Degree: PhD, Geosciences, 2012, Virginia Tech

The Miocene of the Lidam area, Eastern Province, Saudi Arabia, was studied to examine the interaction of glacio-esustasy during moderate Antarctic glaciation, within a small back bulge basin on the slowly subsiding distal Arabian foreland, distal from the active Zagros fold-thrust belt. Low subsidence rates of 1 to 4 cm/k.y generated the long-term accommodation, which were considerable slower than those in the proximal foredeep in Iran. Deposition of the siliciclastics was driven by lowered sea levels, and moderately humid to arid climate. Rising sea levels pushed the siliciclastics updip allowing mixed siliciclastics and carbonates to form downdip, under semi-arid climate and locally hypersaline conditions. Maximum transgression slightly predated the Middle Miocene climatic optimum when prograding siliciclastics migrated across the platform. Falling triggered siliciclastic deposition under semi-arid climate. Sequences appear to relate to long-term obliquity (~1.2 m.y. cycles) and long-term eccentricity (400 k.y.) cycles. The succession contains numerous missing beats reflecting the updip position of the study area, and sea level changes of tens of meters that frequently exposed the platform. Siliciclastic units commonly are incised into muddy sediments beneath sequence boundaries. Multiple exposure surfaces occur within Hadrukh brecciated palustrine carbonates. Within Dam carbonates, parasequence boundaries commonly are capped by tidal flat laminites (some of which are incipiently brecciated). High frequency negative excursions of ∂¹³C within the succession appear to relate to near-surface diagenesis by soil gas depleted in ∂¹³C beneath sequence boundaries. Positive C isotope excursions in the Lidam Miocene section can be tied to similar excursions in Qatar and UAE, where Sr isotope dates constrain the ages of the units. The overall C isotope profile at Lidam shows depleted values early in the Miocene to heavy values in the Middle Miocene, becoming lighter again in the late Miocene. The profile appears to follow the long-term global ∂¹³C curve. Incursion of meteoric groundwaters into the study area was driven by the long-term global sea level changes. Oxygen isotopes are surprisingly light, extending down to -12.5 ‰VPDB. The very light δ¹⁸O values of the meteoric waters may be explained by rainfall associated with enhanced Miocene Indian monsoons, and with far travelled air mass trajectories migrating across north Africa and from the polar region. Advisors/Committee Members: Read, James Fredrick (committeechair), Eriksson, Kenneth A. (committee member), Xiao, Shuhai (committee member), Al-Tawil, Aus (committee member).

Subjects/Keywords: Indian monsoons; Sequence development; Milancovitch cycles; Hofuf Formation; Hadrukh Formation; Dam Formation; Mixed carbonatesiliciclastic; Arabian foreland; Lidam area; Saudi Arabia; Miocene

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alkhaldi, F. M. (2012). Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77082

Chicago Manual of Style (16th Edition):

Alkhaldi, Fawwaz Muhammad. “Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia.” 2012. Doctoral Dissertation, Virginia Tech. Accessed April 08, 2020. http://hdl.handle.net/10919/77082.

MLA Handbook (7th Edition):

Alkhaldi, Fawwaz Muhammad. “Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia.” 2012. Web. 08 Apr 2020.

Vancouver:

Alkhaldi FM. Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2020 Apr 08]. Available from: http://hdl.handle.net/10919/77082.

Council of Science Editors:

Alkhaldi FM. Mixed Carbonate-Siliciclastic Sequence Development and Chemostratigraphy On a Distal Foreland During Miocene Glaciation, Eastern Saudi Arabia. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/77082


Virginia Tech

3. Al-Dukhayyil, Raed Khalil. Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia.

Degree: PhD, Geosciences, 2012, Virginia Tech

Logging of cores of the Upper Permian and Lower Triassic Khuff Formation, Ghawar, Saudi Arabia, has allowed a high resolution sequence stratigraphic framework to be generated. The lithofacies of this huge, arid epeiric ramp succession include: subaqueous -and supratidal anhydrite, tidal flat laminites, lagoonal mudstone, ooid-peloid grainstone, and subtidal off-shoal open marine mudstone. Third order sequences include the Late Permian upper Khuff C, the Early Triassic Khuff B and the Khuff A sequences, which corrrelate with global cycles. Seven high frequency sequences (HFSs) make up the Changhsingian upper Khuff C. These HFSs are ~400 k.y. duration and probably driven by long term eccentricity. The Early Triassic Khuff B and A sequences are made up of 4 HFSs each, which appear to be ~100 to 200 k.y. duration and not easily tied to eccentricity forcing. The HFSs are in turn composed of parasequences, which appear to be 10 to 20 k.y. average durations, suggesting precessional and half precessional forcing. However, many thin locally developed cycles may be autocycles or subprecessional cycles. Sequence stratigraphic cross sections and facies maps document progradation directions on the platform, reflecting the subtle interplay between the Ghawar structure and regional paleoslopes. Anhydrites are rare in the Permian Upper Khuff C except near the base of the studied interval. Anhydrites are well developed in the Triassic Khuff B and Khuff A where some form transgressive deposits while others are highstand deposits of high frequency sequences. The Permian-Triassic boundary (PTB) on the Arabian Platform marks a significant relative sea-level drop, that exposed from the outcrop belt to somewhere east of Ghawar. This contrasts with transgressive PTB settings elsewhere. Across the PTB the mass extinction is marked by a major decrease in biotic groups. The extinction was followed by development of subtidal thrombolites and increased microbial calcification due to decreased bioskeletonization. The dominant reservoirs in the Permian Upper Khuff C occur in oolite in the uppermost high frequency sequence. In the Triassic Khuff B and A the reservoir facies are commonly non-dolomitized oolitic facies associated with open lagoon carbonates distant from evaporitic tidal flats. Within dolomitized units, best reservoirs are associated with oomoldic porosity, but oolite units proximal to evaporitic tidal flats have porosity plugged by anhydrite. Carbon and oxgyen isotope profiles up to 150 m long were obtained from cored wells of the Khuff Formation, Ghawar Field, Saudi Arabia, across the Permian-Triassic boundary. Major global excursions are at the Changhsingian-Wuchiapingian boundary and the Permian-Triassic boundary, but several smaller excursions also appear to correlate with excursions elsewhere. The presence of the negative C-isotope excursions globally in both δ¹³Ccarbonate and δ¹³C organic as well as in deeper water sections lacking emergence surfaces, strongly supports the idea of these excursions being global phenomena related… Advisors/Committee Members: Read, James Fredrick (committeechair), Xiao, Shuhai (committee member), Al-Tawil, Aus (committee member), Eriksson, Kenneth A. (committee member).

Subjects/Keywords: Uranium depletion; C/O isotopes; Sequence stratigraphy; Carbonates; Khuff Fm.; Keywords: Permo-Triassic boundary; Ghawar Field

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Al-Dukhayyil, R. K. (2012). Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77091

Chicago Manual of Style (16th Edition):

Al-Dukhayyil, Raed Khalil. “Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia.” 2012. Doctoral Dissertation, Virginia Tech. Accessed April 08, 2020. http://hdl.handle.net/10919/77091.

MLA Handbook (7th Edition):

Al-Dukhayyil, Raed Khalil. “Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia.” 2012. Web. 08 Apr 2020.

Vancouver:

Al-Dukhayyil RK. Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2020 Apr 08]. Available from: http://hdl.handle.net/10919/77091.

Council of Science Editors:

Al-Dukhayyil RK. Sequence Stratigraphy and Chemostratigraphy Across the Permo-Triassic Extinction Event, Upper Khuff Carbonates, Ghawar Field, Saudi Arabia. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/77091

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