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珠江口盆地文昌13-1油田zj2-1u砂组沉积微相地震刻画

Keywords: 潮坪,沉积微相,地震属性,地震相

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Abstract:

?针对珠江口盆地文昌13-1油田井网稀疏,不同微相砂体厚度及组合特征差异等制约井间砂岩分布及沉积微相刻画的难题,从井点出发通过岩心资料确定了井点沉积微相类型;利用地震属性和地震相分析方法对沉积微相的平面展布规律进行了刻画。通过构建“地震基准弧长对数”属性,并利用该属性进行砂岩厚度定量预测,从而建立了研究区砂坪主体和砂坪侧缘的地震相模式;利用砂岩厚度分布和地震相落实了沉积微相边界。研究结果揭示,该区zj2-1u砂组沉积期经历了“泥坪—混合坪—砂坪”的沉积演化,砂坪主体呈北东向条带状展布,主要分布在研究区中、西部,砂坪侧缘面积大,呈互层状在全区分布。上述认识为油藏开发调整提供了地质依据。

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