Masters Theses


"The Gialo Formation is a major gas producing reservoir in the Assamoud Field, Sirte Basin, Libya. It is called Gialo limestone because it consists of shallow marine limestone. Seismic and well data in conjunction with the results of a previous study were used to delineate the hydrocarbon reservoir of Middle Eocene Gialo Formation of Assamoud Field area located in Eastern part of concession 6, Sirte Basin, Libya. The data include three-dimensional seismic data acquired by Sirte Company in 2009. It covers approximately an area of 150 km² and with more than 10 wells penetrating the reservoir. Seismic data were used to identify any structural and stratigraphic features such as faults and channels which may play important role in hydrocarbon traps. Seismic mapping of two way travel time for the top and the base of Gialo Formation indicates that the highest area in the Assamoud field is at 4840 ft subsea around wells H4-6, H5-6, H6-6, and H 8-7 and the deepest point is at 4900 ft subsea. The well data were used to determine the average petrophysical characteristics of Assamoud field. The results indicate that the Middle Eocene Gialo reservoir is of good high quality with very good porosity reaching 23.9% at well H6-7. The correlation between wells using GR and SP logs indicates that the net thickness of the Gialo Formation ranges from 0 ft in well H2-6 to 220 ft in well H6-6. The gas water contact is at 4859 ft SS. The bulk volume was derived from net isopach map. The original gas in place and the recoverable gas were calculated volumetrically to be 889.23 Billion Standard Cubic Feet (BSCF) and 622.61 (BSCF) respectively. Analysis of seismic and well data demonstrates that the highest producing wells in the study area are those located at structural highs with an average porosity ranging from 20% to 24%"--Abstract, page iii.


Liu, Kelly H.

Committee Member(s)

Gao, Stephen S.
Rustum, Jawad


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology and Geophysics


Arabian Gulf Oil Company


Missouri University of Science and Technology

Publication Date

Summer 2011


xii, 75 pages, maps

Note about bibliography

Includes bibliographical references (pages 72-74).

Geographic Coverage

Sirte Basin (Libya)

Time Period



© 2011 Abdalla Abdelnabi, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Geology, Stratigraphic -- Eocene
Petroleum -- Geology -- Libya -- Sirte Basin
Petroleum -- Maps -- Geology -- Libya -- Sirte Basin
Seismic reflection method

Thesis Number

T 9797

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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