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Structural characteristics and tectonic division of the Zambezi Delta basin in the offshore East Africa:evidences from gravity and seismic data
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作者 Guozhang Fan Wen Li +8 位作者 Liangbo Ding Wanyin Wang Hongping Wang Dingding Wang Lin Li Hao Wang Chaofeng Wang Qingluan Wang Ying Zhang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2024年第4期105-118,共14页
The Zambezi Delta basin is a passive marginal basin located on the East African coast that has good oil and gas exploration potential.Due to the special geological evolutionary background of the Beira High in the Zamb... The Zambezi Delta basin is a passive marginal basin located on the East African coast that has good oil and gas exploration potential.Due to the special geological evolutionary background of the Beira High in the Zambezi Delta basin,it has a low gravity anomaly,and the existing seismic survey lines do not cover the whole basin;therefore,it is difficult to interpret the structural characteristics of the whole basin based solely on gravity or seismic data.Based on satellite altimetry gravity anomaly data,this study infers the distribution characteristics of faults in the Zambezi Delta basin by using the normalized vertical derivative of the total horizontal derivative(NVDR-THDR)technique.Then,constrained by seismic data,the gravity anomaly at the Moho interface is extracted by using the fast forward method of the double-interface model of the gravity anomaly,and this anomaly is then removed from the Bouguer gravity anomaly to obtain the sedimentary layer gravity anomaly.The thickness of the sedimentary strata is obtained by inversing the sedimentary basement depth of the whole basin.Then,uplifts and depressions are divided based on a sedimentary layer thickness of 3 km.This research demonstrates that the Zambezi Delta basin mainly features nearly SN-trending and NE-trending faults and that these faults exhibit east-west partitioning.The nearly SN-trending strike-slip faults controlled the sedimentary development of the basin,and the NE-trending tensile faults may have acted as migration channels for oil,gas and magma.The“overcompensation”effect of the Moho interface gravity anomaly on the gravity anomaly of the sedimentary layer is caused by the depression of the Moho interface beneath the Beira High,which results in a low gravity anomaly value for the Beira High.The pattern of uplifts and depressions trends NE and has the structural characteristics of east-west blocks. 展开更多
关键词 Zambezi Delta basin satellite altimetry gravity anomaly beira High fault division uplift and depression pattern
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莫桑比克贝拉港口地区地基土工程地质性质及主要问题 被引量:2
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作者 戴根宝 杨民 《地质学刊》 CAS 2011年第2期183-187,共5页
通过分析和研究莫桑比克贝拉港口地区以往工程项目的勘察成果,介绍了该地区地基土的工程地质性质及其存在的主要工程地质问题,提出了工程建设施工应采取的相应防护措施,供国内外同行在类似地区进行工程勘察、设计和施工时参考和借鉴。
关键词 地基土 工程地质性质 工程地质问题 贝拉港口地区 莫桑比克
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