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肯尼亚Anza盆地东南部重力场及构造特征

陈青 袁炳强 黄小宇 李君梅 陈浩 丁成艺 孙帅 覃雯

陈青, 袁炳强, 黄小宇, 等, 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, 等, 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
CHEN Qing, YUAN Bingqiang, HUANG Xiaoyu, et al., 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, et al., 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

肯尼亚Anza盆地东南部重力场及构造特征

doi: 10.12090/j.issn.1006-6616.2021.27.06.075
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

Funds: 

the National Natural Science Foundation of China 41702210

the Natural Science Foundation of Chongqing cstc2021jcyj-msxmX1070

the Science and Technology Research Program of the Chongqing Municipal Education Commission 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。

     

  • 图  1  研究区区域地质概况(据Dindi, 1994修改)

    Figure  1.  Regional geological survey of the Anza Basin (modified after Dindi, 1994)

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

    Figure  2.  Contour plane map showing the Buoguer gravity anomaly in the study area (1 mGal=1.0×10-5 m/s2)

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

    Figure  3.  Contour plane map showing the residual gravity anomaly in the study area (1 mGal=1.0×10-5 m/s2)

    图  4  研究区布格重力异常处理结果与断裂划分

    a—垂向二阶导数; b—水平总梯度; c—TAHG; d—NVDR_THDR

    Figure  4.  Processing results of gravity data and fault structure distribution in the study area

    (a) Vertical second derivative; (b) Horizontal total gradient; (c) TAHG; (d) NVDR_THDR

    图  5  研究区基底界面深度图

    Figure  5.  Contour plane map of basement depth in the study area

    图  6  研究区构造单元划分

    Figure  6.  Structual units in the study area

    Figure  7.  Interpretation profile showing the gravity anomaly of the two dimensional seismic reflection profile on line T86-180

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  • 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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