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2021 Vol. 27, No. 6
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CHEN Qing, YUAN Bingqiang, HUANG Xiaoyu, LI Junmei, CHEN Hao, DING Chengyi, SUN Shuai, QIN Wen. 2021. The gravity field and tectonic features in the southeast of the Anza Basin, Kenya. Journal of Geomechanics, 27(6): 928-937. doi: 10.12090/j.issn.1006-6616.2021.27.06.075
Citation: CHEN Qing, YUAN Bingqiang, HUANG Xiaoyu, LI Junmei, CHEN Hao, DING Chengyi, SUN Shuai, QIN Wen. 2021. The gravity field and tectonic features in the southeast of the Anza Basin, Kenya. Journal of Geomechanics, 27(6): 928-937. doi: 10.12090/j.issn.1006-6616.2021.27.06.075
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The gravity field and tectonic features in the southeast of the Anza Basin, Kenya

  • 1.

    Department of Geophysics, School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

  • 2.

    Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development, Chongqing 401331, China

  • 3.

    School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China

  • 4.

    Oil and Gas Exploration Company Shaanxi Yanchang Petroleum(Group) Co., Ltd., Yan'an 716000, Shaanxi, China

  • 5.

    Chongqing 208 Geoenvironmental Research Company Co., Ltd., Chongqing 400700, China

  • 6.

    Chongqing Geology and Minerals Exploration Group Co., Ltd., Chongqing 400700, China

    • Fund Project: This research is financially supported by the National Natural Science Foundation of China (Grant No.41702210), the Natural Science Foundation of Chongqing (Grant No.cstc2021jcyj-msxmX1070), and the Science and Technology Research Program of the Chongqing Municipal Education Commission (Grant No.KJQN201901535)
Received Date:  29 January 2021
Revised Date:  24 October 2021
Publish Date:  28 December 2021
    Abstract

  • The southeast of the Anza Basin in Kenya, located in the East African Rift System, has developed a very thick Mesozoic and Cenozoic sedimentary cover. However, the low level of exploration in this area restricts us from understanding its structural system and evaluating its oil-gas exploration potential. In this study, we processed and interpreted the gravity anomaly data obtained from the study area based on our understanding of its structural characteristics, and the conclusions drawn from the results are as follows. Under the influence of dextral shear stress of the central Africa shear zone, large-scale NW-oriented basement faults and small-scale NE-oriented caprock faults developed in the study area with the latter cutting off the former. The basement depth of the study area varies greatly and is characterized by "one uplift between two depressions". The very thick Mesozoic and Cenozoic cover layer was deposited in depressions. Controlled by the NW-tensional fault as well as the NE-fault developed along the structural weak zone, the study area is divided into four tectonic units: the eastern depression, the central uplift, the southern uplift and the western depression, showing the structural pattern of the "east-west zone and north-south block".

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