Structural characteristics and tectonic division of the Zambezi Delta basin in the offshore East Africa: evidences from gravity and seismic data

Guozhang Fan Wen Li Liangbo Ding Wanyin Wang Hongping Wang Dingding Wang Lin Li Hao Wang Chaofeng Wang Qingluan Wang Ying Zhang

Guozhang Fan, Wen Li, Liangbo Ding, Wanyin Wang, Hongping Wang, Dingding Wang, Lin Li, Hao Wang, Chaofeng Wang, Qingluan Wang, Ying Zhang. Structural characteristics and tectonic division of the Zambezi Delta basin in the offshore East Africa: evidences from gravity and seismic data[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2338-3
Citation: Guozhang Fan, Wen Li, Liangbo Ding, Wanyin Wang, Hongping Wang, Dingding Wang, Lin Li, Hao Wang, Chaofeng Wang, Qingluan Wang, Ying Zhang. Structural characteristics and tectonic division of the Zambezi Delta basin in the offshore East Africa: evidences from gravity and seismic data[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2338-3

doi: 10.1007/s13131-024-2338-3

Structural characteristics and tectonic division of the Zambezi Delta basin in the offshore East Africa: evidences from gravity and seismic data

Funds: The Petrochina Basic Prospective Science and Technology Research Project–Overseas deepwater ultra-deepwater oil and gas exploration technology research topic, under contract No. 2021DJ2403.
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    Corresponding author: E-mail: wwy7902@chd.edu.cn
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    These authors have contributed equally to this word.
  • Figure  1.  Regional geology.

    Figure  2.  Topographic map of the study area.

    Figure  3.  Satellite altimetry gravity anomaly in the study area.

    Figure  4.  Bouguer gravity anomaly in the study area.

    Figure  5.  Distribution of constraint points in the study area.

    Figure  6.  Depth of the Cretaceous top interface in the study area.

    Figure  7.  Depth of the Jurassic bottom interface in the study area.

    Figure  8.  NVDR-THDR of the Bouguer gravity anomaly and the location of the seismic profile in the study area.

    Figure  9.  Comparison of the NVDR-THDR of Bouguer gravity anomaly and the seismic profile.

    Figure  10.  Moho gravity anomaly in the study area.

    Figure  11.  Gravity anomaly of the sedimentary layer and the profile location.

    Figure  12.  Comparison of the gravity anomaly of the sedimentary layer and the Jurassic bottom interface.

    Figure  13.  Comparison of the geological profile (Mueller et al., 2016) and the gravity anomaly.

    Figure  14.  Depth of the Jurassic bottom interface in the study area.

    Figure  15.  Thickness of the sedimentary layer in the study area.

    Figure  16.  The NVDR-THDR of the Bouguer gravity anomaly and the distribution of faults in the study area.

    Figure  17.  Residual Bouguer gravity anomaly and fault distribution in the study area.

    Figure  18.  Rose diagram of the fault length and trend.

    Figure  19.  Uplift and depression pattern in the study area.

    Figure  20.  Comparison of the distribution characteristics of uplifts and depressions with the results of previous studies in the study area.

    Figure  21.  Oil and gas well distribution characteristics and tectonic framework map of the study area.

    Table  1.   Statistical table of the main strata densities (refer to Leinweber et al., 2013)

    Main layer Layer Max thickness/km Main density(103 kg · m−3) Average density(103 kg · m−3)
    Water layer water layer 2.6 1.03 1.03
    Cenozoic sediment layer sediment layer 1 0.9 1.95 2.30
    sediment layer 2 0.8 2.18
    sediment layer 3 1.8 2.39–2.46
    sediment layer 4 1.8 2.40
    Mesozoic sediment layer sediment layer 5 2.4 2.51–2.58 2.60
    sediment layer 6 1.3 2.62
    sediment layer 7 0.9 2.60
    sediment layer 8 2.6 2.64
    Crust upper crust onshore 4.7 2.69 2.90
    middle crust onshore 32.0 2.91
    lower crust 8.0 2.90–3.05
    Mantle upper mantle - 3.27 3.27
    下载: 导出CSV

    Table  2.   Statistical table of the inferred results for the main faults

    Number Identifying characteristics Trend Position Nature Length/km
    DFZ NVDR-THDR continuous ridge value nearly SN east side of basin strike-slip
    F3 NVDR-THDR continuous ridge value NE north side of basin tension 557
    F4 NVDR-THDR continuous ridge value and local dislocation NE eastern part of the basin, which is centered tension 259
    F5 NVDR-THDR continuous ridge value nearly SN mid-basin strike-slip 164
    F6 NVDR-THDR continuous ridge value nearly SN northwestern basin tension 392
    F7 NVDR-THDR continuous ridge value NE north side of Beira High tension 614
    F8 NVDR-THDR continuous ridge value NE south side of Beira High tension 305
    F9 NVDR-THDR continuous ridge value nearly SN west side of basin strike-slip 265
    下载: 导出CSV
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  • 收稿日期:  2023-08-01
  • 录用日期:  2024-04-15
  • 网络出版日期:  2024-05-11

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