Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 1-14.doi: 10.12108/yxyqc.20220301

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Formation conditions and exploration direction of large-scale lithologic reservoirs of Cenozoic in Bohai Sea

NIU Chengmin, DU Xiaofeng, WANG Qiming, ZHANG Can, DING Yiran   

  1. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-10-30 Revised:2022-02-04 Online:2022-05-01 Published:2022-05-12

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Abstract: Based on the systematic analysis of structural evolution， sedimentary filling evolution characteristics under sequence framework and the characteristics of the main source rocks in Cenozoic basin in Bohai Sea， the formation conditions and development characteristics of large-scale lithologic reservoirs in Bohai Sea were analyzed， and the favorable exploration fields and next research directions were clarified. The results show that： （1）Paleogene Shahejie Formation，Dongying Formation and the lower member of Neogene Minghuazhen Formation are the key strata for forming large lithologic reservoirs in Bohai Sea. The lower member of Minghuazhen Formation was in the lacustrine shrinking period，forming three types of large-scale lithologic reservoirs，such as river channel， very shallow delta and river-lake interaction system. Dongying Formation was in the depression period，and two types of large-scale sublacustrine fan lithologic reservoirs，slump turbidite fans and slope-sliding fans，were formed due to the supply of water system outside the basin. Shahejie Formation was in the fault depression period， affected by local provenance in the basin，it formed three types of large-scale lithologic reservoirs，including near-source fan delta lateral pinch out type，strike slope stratigraphic overlap type and updip pinch-out type. Among them，the river-lake interaction system of the lower member of Minghuazhen Formation and the nearsource fan bodies of Shahejie Formation are the most favorable areas.（2）The lower member of Minghuazhen Formation in western Huanghekou Sag and slope area surrounding Bozhong Sag has great exploration potential， which is the most realistic exploration field for increasing reserves in Bohai Sea. The near-source fan bodies of Shahejie Formation in the steep slope zones of western Shijiutuo uplift，Bonan low uplift and Chengbei low uplift are the key breakthrough directions for next exploration. The sublacustrine fans of Dongying Formation have good exploration prospect in the surrounding areas of Bozhong Sag，and the central and northern Liaozhong Sag. The large-scale progradational delta of the third member of Shahejie Formation in northern Laizhouwan Sag and the beach bar of the first and second members of Shahejie Formation in the surrounding areas of Bozhong Sag are potential favorable exploration fields.

Key words: near-source fans, shallow water delta, river-lake interaction system, large-scale lithologic reservoirs, Shahejie Formation, Dongying Formation, the lower member of Minghuazhen Formation, Bohai Sea

CLC Number: 

  • TE122.1
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