Seismic stratigraphic interpretation and reservoir characterization of the Mamuniyat Formation in the B-NC115 field, Murzuk Basin, Libya

Author

Hesham A. Refayee

Abstract

"Paleozoic succession in Libya offers much potential for scientific investigation and oil industry exploration due to the prolific reserve of hydrocarbons contained within the rocks of that region. The Paleozoic stratigraphy in Libya is divided into two mega sequences, a lower sequence extending from Cambrian to Silurian and upper sequence extending from Devonian to Permian. Mamuniyat Formation, a late Ordovician outcrop succession which is the main reservoir in Murzuk Basin, is composed of massive cross-bedded sandstone, most of which is generally medium to coarse grain. In B-NC115 field, the Mamuniyat Formation shows varied thickness which is a result of paleotopographic highs of glacial related origin. This formation is divided into three sequences based on the lithofacies and well log data pattern. The upper sequence, which was deposited when sea level fell, is the producing unit that has more than 100 ft (30.40 m) of net pay in some areas with good porosity and permeability. This sequence has three facies, and has thickness of 200 ft (60.96 m) of sand, interbeded with shales. They range from one foot to several feet and are recognized by log pattern and also field observation. Depth, structure, and isochron maps addressed the paleohigh structure, which is a combination of structure and stratigraphic feature. The reservoir shows good porosity and permeability range from 9% to 12%, and 500-1000 mD respectively. Seismic interpretation showed the progressive onlapping of the Silurian shale units over the Mamuniyat paleohighs, which known as the paleoglacial related trap. Although there is no significant fault signature in the field, a possible normal-faulted anticline has been recognized. Crossplot analysis and petrophysical results indicate the heterogeneity of the field. Oil-water contact has been determined by the resistivity logs at -3052 ft SS (922.02 m)"--Abstract, page iii.

Advisor(s)

Liu, Kelly H.

Committee Member(s)

Numbere, Daopu T.
Oboh-Ikuenobe, Francisca

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology and Geophysics

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2008

Pagination

ix, 59 pages

Note about bibliography

Includes bibliographical references (pages 57-58).

Geographic Coverage

Murzuq Basin (Libya and Niger)
Libya

Rights

© 2008 Hesham Ahmad Refayee, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Geology -- LibyaGeology -- Murzuq Basin (Libya and Niger)Seismic reflection method

Thesis Number

T 9442

Print OCLC #

315891879

Electronic OCLC #

906029006

Recommended Citation

Refayee, Hesham A., "Seismic stratigraphic interpretation and reservoir characterization of the Mamuniyat Formation in the B-NC115 field, Murzuk Basin, Libya" (2008). Masters Theses. 78.
https://scholarsmine.mst.edu/masters_theses/78