Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 145-152.doi: 10.12108/yxyqc.20260213

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Tectonic characteristics of Miaoxinan area at the margin of Bohai Bay Basin and their controls on hydrocarbon accumulation

ZHAO Ye1(), XU Peng1, HU Hewei1, WANG Hang1, YANG Jiaojiao2   

  1. 1 Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
    2 Engineering Technology Company, CNOOC Energy Development Co., Ltd., Tianjin 300452, China
  • Received:2025-07-15 Revised:2025-08-21 Online:2026-03-01 Published:2025-12-16

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Abstract:

Using three-dimensional seismic data, drilling and logging data, and geochemical testing data，the depression structure, structural evolution characteristics, source rock distribution, and controlling effects of hydrocarbon accumulation in Miaoxinan area of Bohai Bay Basin were studied. The results show that: （1） Miaoxinan area is a transformed depression formed by the Tan-Lu strike-slip fault. During Middle-Late Eocene, the near east-west regional compression movement led to the transformation of the depression structure from NWW to NEE, the fourth section of Shahejie Formation (E2s4) was gradually weakened in erosion intensity from east to west, and source rocks of E2s4 in south sag of Miaoxi Sag on the east side were completely eroded. The high-sulfur and salty high-quality source rocks of E2s4 in the east sag of Huanghekou Sag on the west side have been preserved. （2） The east sag of Huanghekou Sag has developed long-term active faults that extend deep into source rocks of E2s3 and E2s4, oil and gas migrate and accumulate upward along the source-connecting faults, demonstrating the characteristics of deep and shallow compound hydrocarbon accumulation. （3） The south sag of Miaoxi Sag has only developed low-maturity hydrocarbon source rocks in E2s3, and the late stage activity of source-connecting faults is poor, oil and gas are difficult to break through the thick mudstone cap of Dongying Formation, and natural gas reserves have only been discovered in deep E2s1 and E2s2. In Middle-Late Eocene, the near east and west compression activities of eastern China played an important controlling role in the structure of basin margin depression, the distribution of source rocks and the accumulation of oil and gas.

Key words: Tan-Lu strike-slip fault, depression structure, differential erosion, source-connecting fault, source rocks, Shahejie Formation, Eocene, Miaoxinan area, Bohai Bay Basin

CLC Number: 

  • TE122.1

Fig. 1

Regional location of Miaoxinan area （a）， Cenozoic bottom morphology （b） and comprehensive stratigraphic column of Paleogene (c)， Bohai Bay Basin"

Fig. 2

Structural profile of east-west depression in Miaoxinan area of Bohai Bay Basin"

Fig. 3

Evolution profile of east-west depression in Miaoxinan area of Bohai Bay Basin"

Fig. 4

Near north-south structural profile of east sag in Huanghekou Sag， Bohai Bay Basin"

Fig. 5

Comprison of east-west oil reservoir profiles in Miaoxinan area of Bohai Bay Basin"

Fig. 6

Oil source correlation between east sag of Huanghekou Sag and south sag of Miaoxi Sag， Bohai Bay Basin"

Fig. 7

Near east-west seismic profile （a） and T6 layer flattened seismic profile （b） of Miaoxinan area， Bohai Bay Basin"

Fig. 8

Lithologic combination characteristics of the fourth member of Shahejie Formation in well LK31-A of Miaoxinan area， Bohai Bay Basin"

Fig. 9

Hydrocarbon accumulation models of Miaoxinan area in Bohai Bay Basin"

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