Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 162-171.doi: 10.12108/yxyqc.20250615

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon migration and accumulation characteristics of lithologic reservoirs in lower Minghuazhen Formation of Neogene in Qinhuangdao M-3 area, Shijiutuo uplift, Bohai Sea

CHENG Yan, ZHANG Tongyao, HAO Peng, YANG Jianghao, LIU Xuerui, ZHANG Weisen, HE Junhui, WANG Bo   

  1. Engineering Technology Branch of CNOOC Energy Development Co., Ltd, Tianjin 300452, China
  • Received:2025-02-17 Revised:2025-04-10 Online:2025-11-01 Published:2025-11-07

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Abstract: Through comparing and analyzing the geochemical characteristics of source rocks in Bozhong Sag and Qinnan Sag, the oil source correlation and hydrocarbon migration pathway of the middle part of lower Minghuazhen Formation in Neogene of Shijutuo uplift were studied, and the crude oil migration and accumulation characteristics of oil reservoir in Qinhuangdao M-3 area were analyzed. The results show that: (1) Source rocks in Qinnan Sag have high values of C19/C23 tricyclic terpane, C20/C23 tricyclic terpane, extended tricyclic terpane ratio (ETR) and gammacerane/αβ-hopane, while source rocks in Bozhong Sag have high values of C35/C34 22S homohopane and C27Dia/C27St.(2) Crude oil in the middle part of Shijutuo uplift in Qinhuangdao M-3 area exhibits characteristics of high density, high viscosity, narrow distribution range of δ13C value and relatively light saturated hydrocarbon isotopic, while crude oil in the northern and northeastern parts shows low density, low viscosity and wide distribution range of δ13C value.(3) Crude oil groups in Shijutuo uplift can be divided into three types: Type Ⅰ iscrude oil from the eastern oil reservoirs of Shijutuo uplift, with low values of C27Dia/C27St, medium ETR and low-medium values of C35/C34 22S homohopane, and the oil source is mainly from the Sha3 Member of Qinnan Sag. Type Ⅱ is crude oil from the northern and some middle parts of Shijutuo uplift, with high values of C27Dia/C27St, high values of C35/C34 22S homohopane and medium values of gammacerane/αβ-hopane, and the crude oil mainly comes from Shahejie Formation of Bozhong Sag, mixed with the crude oil from the Sha3 Member of Qin‐nan Sag. Type Ⅲ is crude oil from some middle parts of Shijutuo uplift, with high values of C27Dia/C27St, medium-high values of gammacerane/αβ-hopane and medium values of C35/C34 22S homohopane, and the crude oil mainly comes from the Sha3 Member of Bozhong Sag, mixed with the crude oil from the Sha1 Member.(4) The regular changes of parameters of 4-MDBT/1-MDBT, 2, 4-DMDBT/1, 4-DMDBT, 4, 6-DMDBT/1, 4-DMDBT, (Pr+Ph)/C30Hop and QGF index values of crude oil in the study area indicate that the oil and gas migration pathway of source rocks in Qinnan Sag is from southeast to the middle and then to the northwest, while the oil and gas migration pathway of source rocks in Bozhong Sag is from southeast to northwest.

Key words: lithologic reservoirs, oil source correlation, hydrocarbon migration pathway, cluster analysis, Qinnan Sag, Bozhong Sag, Minghuazhen Formation, Shijiutuo uplift, Bohai Bay Basin

CLC Number: 

  • TE122.1
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