Petroleum origin and accumulation in the rift basin: a case study from the Nanpu sag, Bohai Bay basin, China

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• 作者：Lixin Pei ; Wenzhe Gang ; Gang Gao ; Yuexia Dong…
• 关键词：Biomarker association ; Oil ; source correlation ; Residual paleo ; reservoir ; Nanpu sag ; Bohai Bay basin
• 刊名：Arabian Journal of Geosciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：9
• 期：3
• 全文大小：1,011 KB
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• 作者单位：Lixin Pei (1)
  Wenzhe Gang (1)
  Gang Gao (1)
  Yuexia Dong (2)
  Zhilong Huang (1)
  
  1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum-Beijing, Fuxue Road No. 18, Changping, Beijing, 102249, China
  2. PetroChina Jidong Oilfield Company, Tangshan, 063004, China
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

The origin of oil reservoirs in four structural belts in the Nanpu sag, Bohai Bay basin, was studied on the basis of the results of Rock-Eval pyrolysis on 140 samples and biomarker analysis on 30 source rock samples and 43 oil samples. The three possible source rock intervals have different biomarker associations and were deposited in different environments. The third member of the Shahejie Formation (Es₃) is characterized by relatively high gammacerane/αβ C₃₀ hopane (>0.09), high extended tricyclic terpane ratio (ETR) ([C₂₈ + C₂₉]/[C₂₈ + C₂₉ + Ts]) (>0.4)), low C₂₇ diasterane/sterane (<1.0), and low C₂₇/C₂₉ steranes (<1.13), and was deposited in saline-water, anoxic conditions with high contribution from terrestrial organic matter (TOM). In contrast, the first member of the Shahejie Formation (Es₁) and the third member of the Dongying Formation (Ed₃) were characterized by low gammacerane/αβ C₃₀ hopane (<0.09), low ETR (<0.4), and were deposited in freshwater-dominated, anoxic conditions, but have different C₂₇ diasterane/sterane (0.73–1.08 and 0.72–2.24, respectively) and C₂₇/C₂₉ steranes (0.94–1.47 and 1.12–1.82, respectively). Three oil groups have been identified in the study area of the Nanpu sag. Oils mainly originated from paleo-reservoirs during the period of Neotectonism not from the source rocks directly. Such a petroleum origin and accumulation pattern has important implication for petroleum exploration. The residual paleo-reservoirs may occur in Es₃ of Nanpu 1 and Nanpu 5 structural belts, Es₁ of the Nanpu 4 structural belt, and Es₃ and Es₁ of the Nanpu 2 structural belt in the Nanpu sag, Bohai Bay basin.