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肯尼亚Anza盆地东南部重力场及构造特征

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陈青, 袁炳强, 黄小宇, 李君梅, 陈浩, 丁成艺, 孙帅, 覃雯. 2021. 肯尼亚Anza盆地东南部重力场及构造特征. 地质力学学报, 27(6): 928-937. doi: 10.12090/j.issn.1006-6616.2021.27.06.075
引用本文: 陈青, 袁炳强, 黄小宇, 李君梅, 陈浩, 丁成艺, 孙帅, 覃雯. 2021. 肯尼亚Anza盆地东南部重力场及构造特征. 地质力学学报, 27(6): 928-937. doi: 10.12090/j.issn.1006-6616.2021.27.06.075
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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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肯尼亚Anza盆地东南部重力场及构造特征

  • 1.

    重庆科技学院石油与天然气工程学院地球物理系, 重庆 401331

  • 2.

    复杂油气田勘探开发重庆市重点实验室, 重庆 401331

  • 3.

    西安石油大学地球科学与工程学院, 陕西 西安 710065

  • 4.

    陕西延长石油(集团)有限责任公司油气勘探公司, 陕西 延安 716000

  • 5.

    重庆市二零八地质环境研究院有限公司, 重庆 400700

  • 6.

    重庆市地质矿产勘查开发集团有限公司, 重庆 400700

  • 基金项目:
    国家自然科学基金项目（41702210）；重庆市自然科学基金项目（cstc2021jcyj-msxmX1070）；重庆市教委科学技术研究项目（KJQN201901535）
详细信息
    作者简介: 陈青(1984-), 女, 博士, 讲师, 从事构造地球物理、重磁资料处理与解释研究。E-mail: chenqing0144@126.com

  • 中图分类号: P631.1

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)

    摘要

  • 肯尼亚Anza盆地东南部地处东非裂谷系，发育了巨厚的中—新生界沉积盖层。然而，该区域勘探程度较低，制约了对其构造体系的认识及油气勘探潜力的评价。文章基于研究区的重力异常数据，针对其构造特征的认识进行了数据处理及解释。研究结果表明，受中非剪切带右旋剪切应力的影响，研究区发育规模较大的北西向基底断裂和规模较小的北东向盖层断裂，且北东向断裂切断北西向断裂；基底深度差异大，总体呈"两凹夹一隆"的特征，凹陷区沉积了巨厚的中—新生界盖层；受北西向拉张断裂和沿构造软弱带发育的北东向断裂的控制，研究区划分为东部凹陷、中部凸起、南部隆起和西部凹陷4个构造单元，呈现"东西分带、南北分块"的构造格局。

    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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  • 图 1  研究区区域地质概况(据Dindi, 1994修改)

    Figure 1. 

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    图 2  研究区布格重力异常图(1 mGal=1.0×10-5 m/s2)

    Figure 2. 

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    图 3  研究区剩余重力异常图(1 mGal=1.0×10-5 m/s2)

    Figure 3. 

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    图 4  研究区布格重力异常处理结果与断裂划分

    Figure 4. 

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    图 5  研究区基底界面深度图

    Figure 5. 

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    图 6  研究区构造单元划分

    Figure 6. 

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    Figure 7. 

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出版历程
收稿日期:  2021-01-29
修回日期:  2021-10-24
刊出日期:  2021-12-28

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