Thesis (Ph.D)-Cairo University, 2025.

Bibliography: pages 131.

The Baltim gas fields, located offshore in the Nile Delta, are known for substantial gas
condensate accumulations within the Pleistocene (El-Wastani Formation) and Pliocene (Kafr El-
Sheikh Formation) reservoirs. This study aims to evaluate the hydrocarbon potential of these
reservoirs by employing a comprehensive geophysical approach, incorporating seismic data
interpretation, seismic inversion, and extended elastic impedance (EEI) modeling. The primary
objective is to accurately identify gas-bearing zones, estimate Gas Initially In Place (GIIP), and
propose optimal drilling locations to reduce exploration risks. The study begins with analyzing
structural seismic attributes such as fault discontinuity and coherence, which were integrated to
assess the compartmentalization and faulting characteristics of the reservoirs, critical for
understanding hydrocarbon trapping mechanisms. Additionally, stratigraphic seismic attributes,
including sweetness, reflection strength, and spectral decomposition, were used to delineate gas-
bearing sands and channel fairways within the Pleistocene and Pliocene formations, with spectral
decomposition helping identify significant channelized reservoirs with potential for gas
accumulation. Post-stack seismic inversion techniques were applied to estimate gas volumes and
refine the GIIP calculations, revealing significant gas accumulations in the target reservoirs. The
GIIP for the Pleistocene anomaly was estimated at approximately 0.4 Gm³ (14.1 BCF), while the
Pliocene anomaly exhibited an estimated GIIP of 32.87 BCF (0.93 Gm³) to 33.93 BCF (0.96 Gm³).
Additionally, pre-stack seismic inversion and EEI analysis were employed to further characterize
the lithology and refine the identification of gas-bearing sands, allowing for a more accurate
estimation of reservoir properties, including porosity and water saturation. The Probability of
Success (POS) for the Pleistocene gas-bearing sands increased from 49% to 69%, while for the
Pliocene anomaly, the POS improved from 46% to 66%. These enhancements in success
probability strongly support the potential of both reservoirs for gas production. Based on these
results, it is recommended that an exploratory well be drilled in each anomaly to confirm the gas
presence, and upon successful exploration, additional development wells can be drilled to
maximize production from these promising gas reservoirs.

هدف هذه الدراسة إلى توصيف خزانات الغاز في حقل بلطيم بدقة، وذلك من خلال دمج السمات السيزمية (Seismic Attributes)، وتحليل السعة مقابل الإزاحة (AVO)، والانقلاب السيزمي (Seismic Inversion)، وتحليل الممانعة المرنة الممتدة (EEI)، مع بيانات التسجيلات البئرية. ركزت الدراسة على تكوينات العصر البلايستوسيني (الوسطاني) والعصر البليوسيني (تكوين كفر الشيخ) التي تحتوي على تراكمات غازية كبيرة.
أظهرت النتائج فعالية دمج الطرق الجيوفيزيائية المتقدمة في تحسين تحديد الرمال الحاملة للغاز، وتقليل الغموض في التفسير، وزيادة احتمالية النجاح (POS) في عمليات الحفر المستقبلية. كما تم تقدير الغاز الأصلي في المكان (GIIP) لكل من شذوذات البلايستوسين والبليوسين، حيث بينت النتائج وجود إمكانات واعدة للحفر والتنمية في المنطقة.

Issues also as CD.

Text in English and abstract in Arabic & English.