肯尼亚Anza盆地东南部重力场及构造特征

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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.
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