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苏北盆地高邮凹陷基底断裂构造特征及成因演化

Keywords: 高邮凹陷,基底断裂,真武断裂,构造特征,成因演化

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Abstract:

?基底断裂是深化盆地构造和油气勘探研究的重要领域。以苏北盆地高邮凹陷为研究对象,综合利用钻井、地震、地质、重磁等多元化资料,对基底断裂进行精细构造解释,明确其几何学、运动学特征及成因演化模式。结果表明,高邮凹陷存在一条主干基底断裂(即真武断裂),平面上呈弯曲线性发育,西段走向nee向、倾向nnw向,东段走向ne向、倾向nw向,剖面上呈铲式发育,后期继承性演化为浅层的真①断层和吴①断层,并发育挤压、反转、伸展、走滑等4类典型构造样式。挤压期和反转期,真武断裂西部活动性强于真武断裂东部活动性;伸展期,真①断层活动性强于吴①断层。在区域动力学分析基础上,分5个阶段解释了高邮凹陷基底断裂的成因和演化。

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