Use of comprehensive two-dimensional gas chromatography for the characterization of ultra-deep condensate from the Bohai Bay Basin,China |
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| Institution: | 1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2. School of Energy Resource, China University of Geosciences, Beijing 100083, China;3. Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada;4. Research Institute of Petroleum Exploration and Development, PetroChina Huabei Oilfield Company, Hebei 062550, China;1. Petroleum Reservoir Group (PRG), Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada;2. School of Energy Resource, China University of Geosciences, Beijing 100083, China;1. Research Institute of Petroleum Exploration and Development, PetroChina, 20 Xueyuan Road, Haidian District, Beijing 100083, China;2. Department of Environment Engineering and Chemistry, Luoyang Institute of Science and Technology, 90, Wangcheng Road, Luoyang 471023, Henan, China;3. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China;4. Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology, 30 Xueyuan Road, Haidian District, Beijing 100083, China;1. School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China;2. Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada;3. Research Institute of Petroleum Exploration & Production, PetroChina, Langfang 065007, China;1. Australian Centre for Research on Separation Science (ACROSS), University of Tasmania, Private Bag 75, 7005 Tasmania, Australia;2. Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada;1. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China;2. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;1. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences, Wuhan), Ministry of Education, Wuhan 430074, China;2. School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China;3. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China |
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| Abstract: | A gas condensate from well ND1 in the Jizhong Depression of the Bohai Bay Basin, China is characterized by two-dimensional gas chromatography with flame ionization detector (GC × GC–FID) and time-of-flight mass spectrometry (GC × GC–TOFMS). This condensate is sourced from the fourth member of the Shahejie Formation (Es4) but reservoired in the Mesoproterozoic Wumishan Formation carbonate at a depth of 5641–6027 m and the reservoir temperature is 190–201 °C. It is the deepest and the highest temperature discovery in the basin to date. The API gravity of the condensate is 51° and the sulfur content is < 0.04%. A total of 4955 compounds were detected and quantified. Saturated hydrocarbons, aromatic hydrocarbons and non-hydrocarbon account for 94.8%, 5.1% and 0.02% of the condensate mass, respectively. Some long chain alkylated cyclic alkanes, decahydronaphthalenes and diamondoids are tentatively identified in this condensate. The C6–C9 light hydrocarbon parameters show that the gas condensate was generated at relatively high maturity but its generation temperature derived from the dimethylpentane isomer ratio seems far lower than the current reservoir temperature. Some light hydrocarbon parameters indicate evaporative fractionation may also be involved due to multiple-charging and mixing. The diamondoid concentrations and gas oil ratio (GOR) suggest that the ND1 condensate results from 53.3–55% cracking. Since significant liquids remain, the exploration potential of ultra-deep buried hill fields in the Bohai Bay Basin remains high. |
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