The origin of crude oils from the Shuguang-Huanxiling Buried Hills in the Liaohe Basin,China: evidence from chemical and isotopic compositions |
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| Institution: | 1. The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China;2. The University of Petroleum, Beijing 102200, PR China;1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences (Wuhan), Ministry of Education, Wuhan 430074, China;2. SINOPEC Northeast Oil and Gas Branch Company, Changchun, Jilin 130062, China;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada;1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;2. China University of Petroleum, Beijing 102249, China;3. Yangtze University, Jingzhou 434023, China;4. China National Oil and Gas Exploration and Development Corporation, Beijing 100724, China;1. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Chinese Ministry of Education, Wuhan 430074, China;2. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;4. China University of Petroleum, Changping, Beijing 102249, China;1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Haidian District, Beijing 100081,China;2. Petrochina Research Institute of Petroleum Exploration and Development-Langfang, Langfang, Hebei 065007,China;3. Research Institute of Exploration＆ Development, PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202, China;4. PetroChina Research Institute of Petroleum Exploration＆Development—Northwest, Lanzhou, Gansu 730020, China;1. Research Institute for Earth Sciences, Geological Survey of Iran, Iran;2. Mahab Consulting Engineers, Tehran, Iran |
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| Abstract: | Since the Shu103 well was successfully drilled in 1995, the Buried Hill reservoir is receiving a new exploration emphasis in the Liaohe Basin, China. The Buried Hill oils can be divided into 3 main types in the Shuguang-Huangxiling area based on their chemical and isotopic compositions. The first type is collected mostly from the Shuguang area. The similarity to the Es4 oils and the Es4 source rock extracts indicates that they were mainly expelled from the fourth member of the Shahejie formation (Es4) in the Chenjia Sag and/or Panshan Sag, deposited in a stratified paleolake system. The second is charactized by a relative high Pr/Ph ratio, low gammacerane content and depletion of 12C in individual n-alkanes. These characteristics represent a typical origin from dominantly freshwater paralic lacustrine sediments. Various biomarker indices of the other Buried Hill oils fall between the former two types. The authors infer that these oils may be derived from the adjacent Qingshui Sag and/or Panshan Sag, and were likely generated from transitional sedimentary facies between well-circulated freshwater paralic lacustrine and relatively closed saline lacustrine. |
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