Using gas geochemistry to delineate structural compartments and assess petroleum reservoir-filling directions: A Venezuelan case study |
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| Institution: | 1. Departamento de Ingeniería Minera, Mecánica y Energética, Universidad de Huelva, 21819 Huelva, Spain;2. CARBOZULIA S.A., Av. 2 No. 55-185, Casa Mene Grande & Universidad del Zulia, Maracaibo 4002 A, Venezuela;3. Departmento de Exploración y Prospección de Minas, Universidad de Oviedo, 33600 Mieres, Spain;4. REPSOL Exploración S.A., Paseo de la Castellana 280, 28046 Madrid, Spain;1. Guangdong University of Petrochemical Technology, Maoming 525000, China;2. Northeast Petroleum University, Daqing 163318, China;3. Exploration and Development Research Institute of PetroChina Huabei Oilfield Company, Renqiu 062552, China;4. China University of Geosciences, Beijing 100083, China;1. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210023, China;2. Department of Geosciences, The University of Tulsa, Tulsa, OK 74104, USA;3. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China;1. Coordinación de Procesos Químicos, Universidad Politécnica Territorial del Oeste de Sucre “Clodosbaldo Russián”, Cumaná 6101, Venezuela;2. Facultad de Ciencias de la Ingeniería, Universidad Estatal Península de Santa Elena, La Libertad 241553, Ecuador;3. Centro de Geoquímica, Instituto de Ciencias de la Tierra, Universidad Central de Venezuela, Caracas 1040, Venezuela;4. Unidad de Geoquímica, Instituto Zuliano de Investigaciones Tecnológicas INZIT, Maracaibo 4001, Venezuela;5. Facultad de Ingeniería, Universidad del Zulia & Carbozulia, Maracaibo 4002-A, Venezuela;1. Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark;2. Geological Survey of Denmark and Greenland, Department of Geochemistry, Øster Voldgade 10, 1350 København K, Denmark;1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China;2. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, USA;3. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | Here we examined the light hydrocarbon and nitrogen content and isotopic signatures of eleven gaseous samples in order to evaluate lateral intra-reservoir continuity in a Venezuelan reservoir in the central area of Lake Maracaibo Basin. At least three single compartments, located in the northern-central and southern parts of the reservoir, are revealed by nitrogen concentrations showing clear step-like compositional breaks. The occurrence of step-breaks was also supported by the isotopic signature of individual hydrocarbon compounds in the range of C1–C4 alkanes. Samples presented only slight differences in N2 and hydrocarbon gas compositions within the central and northern parts of the reservoir, and therefore it was not possible to infer structural barriers in coherence with the geological section. Some oil bulk parameters corroborate gradual changes that provide additional information on the reservoir-filling history, thus suggesting that the lateral physical–chemical equilibrium of fluids was not reached in this reservoir. |
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