Assessing Lateral Continuity within the Yammama Reservoir in the Foroozan Oilfield, Offshore Iran: An Integrated Study

作     者：Payam HASSANZADEH Ahmad Reza RABBANI Ardeshir HEZARKHANI Saeed KHAJOOIE 

作者机构：Department of Petroleum EngineeringAmirkabir University of Technology Department of Mining and Metallurgy EngineeringAmirkabir University of Technology Department of Reservoir EngineeringExploration Directorate of National Iranian Oil Company (NIOC-EXP) 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2018年第92卷第6期

页      面：2405-2415页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0816[工学-测绘科学与技术] 

基　　金：financially supported by the Exploration Directorate of the National Iranian Oil Company 

主　　题：reservoir compartmentalization gas geochemistry light hydrocarbons reservoir engineering Yammama Reservoir Foroozan Oilfield Iran 

摘      要：Located in Iranian sector of the Persian Gulf, Foroozan Oilfield has been producing hydrocarbons via seven different reservoirs since the 1970 s. 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 δ13 C1, lower methane concentration, and negative sulfur isotope in the southern part) and light hydrocarbon ratios(e.g. nC 7/toluene, 2,6-dmC7/1,1,3-tmcyC5 and m-xylene/4-mC8) 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.