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Assessing Lateral Continuity within the Yammama Reservoir in the Foroozan Oilfield, Offshore Iran: An Integrated Study
Author(s) -
HASSANZADEH Payam,
RABBANI Ahmad Reza,
HEZARKHANI Ardeshir,
KHAJOOIE Saeed
Publication year - 2018
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13736
Subject(s) - submarine pipeline , geology , petroleum engineering , geotechnical engineering
Located in Iranian sector of the Persian Gulf, Foroozan Oilfield has been producing hydrocarbons via seven different reservoirs since the 1970s. However, understanding fluid interactions and horizontal continuity within each reservoir has proved complicated in this field. This study aims to determine the degree of intra‐reservoir compartmentalization using gas geochemistry, light hydrocarbon components, and petroleum bulk properties, comparing the results with those obtained from reservoir engineering indicators. For this purpose, a total of 11 samples of oil and associated gas taken from different producing wells in from the Yammama Reservoir were selected. Clear distinctions, in terms of gas isotopic signature and composition, between the wells located in northern and southern parts of the reservoir (i.e. lighter δ 13 C 1 , lower methane concentration, and negative sulfur isotope in the southern part) and light hydrocarbon ratios (e.g. nC 7 /toluene, 2,6‐dmC 7 /1,1,3‐tmcyC 5 and m‐xylene/4‐mC 8 ) in different oil samples indicated two separate compartments. Gradual variations in a number of petroleum bulk properties (API gravity, V/Ni ratios and asphaltene concentration) provided additional evidence on the reservoir‐filling direction, signifying that a horizontal equilibrium between reservoir fluids across the Yammama Reservoir is yet to be achieved. Finally, differences in water‐oil contacts and reservoir types further confirmed the compartmentalization of the reservoir into two separate compartments.