Hydrocarbon migration and accumulation of the Suqiao buried-hill zone in Wen'an Slope,Jizhong Subbasin,Bohai Bay Basin,China |
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| Institution: | 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. Research Center for Basin and Reservoir, China University of Petroleum, Beijing 102249, China;3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;4. PetroChina Huabei Oilfield Company, Renqiu, Hebei 062552, China;1. EMR | Energy and Mineral Resources Group, Reservoir-Petrology, RWTH Aachen University, Germany;2. Wintershall Holding GmbH, Germany;3. Institute of Applied Geosciences, Structural Geology & Tectonics, Karlsruhe Institute of Technology, Germany;4. TTE Reservoir-Geology, KIT Campus Transfer GmbH, Karlsruhe, Germany;1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China;4. SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China;1. Energy & Mineral Resources Group (EMR), Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Lochnerstrasse 4-20, 52056 Aachen, Germany;2. Geology Department, Geosciences Division IFP Energies Nouvelles, 1&4 Av. de Bois-Préau, 92852 Rueil-Malmaison Cedex, France;3. Ludzislawice 36, PL-66431 Santok, Poland;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of Petroleum, Beijing 102249, China;3. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China |
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| Abstract: | The hydrocarbon migration and accumulation of the Suqiao deep buried-hill zone, in the Jizhong Subbasin, the Bohai Bay Basin, eastern China, was investigated from the perspective of paleo-fluid evidence by using fluid inclusions, quantitative fluorescence techniques (QGF), total scanning fluorescence method (TSF) and organic geochemical analysis. Results show that the current condensate oil-gas reservoirs in the study area once were paleo-oil reservoirs. In addition, the reservoirs have experienced at least two stages of hydrocarbon charge from different sources and/or maturities. During the deposition of the Oligocene Dongying Formation (Ed), the deep Ordovician reservoirs were first charged by mature oils sourced from the lacustrine shale source rocks in the fourth member of Shahejie and Kongdian Formations (Es4+Ek), and then adjusted at the end of Ed period subsequently by virtue of the tectonic movement. Since the deposition of the Neogene Minghuazhen Formation (Nm), the reservoirs were mainly charged by the gas that consisted of moderate to high-maturity condensate and wet gas sourced from the Es4+Ek lacustrine shale source rocks and mature coal-derived gas sourced from the Carboniferous-Permian (C-P) coal-bearing source rocks. Meanwhile, the early charged oil was subjected to gas flushing and deasphalting by the late intrusion of gas. The widely distributed hydrocarbon inclusions, the higher QGF Index, and FOI (the frequency of oil inclusions) values in both gas-oil and water zone, are indicative of early oil charge. In addition, combined with the homogenization temperatures of the fluid inclusions (<160 °C) and the existence of solid-bitumen bearing inclusions, significant loss of the n-alkanes with low carbon numbers, enrichments of heavier components in crude oils, and the precipitation of asphaltene in the residual pores suggest that gas flushing may have played an important role in the reservoir formation. |
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| Keywords: | Fluid inclusions Quantitative grain fluorescence Total scanning fluorescence Hydrocarbon migration and accumulation Suqiao buried-hill zone Bohai Bay Basin |
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