基于统计学岩石物理模型的火山岩横波速度预测方法
S-Wave Velocity Prediction Method of Volcanic Rock Based on Statistical Rock-Physics Model
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火山岩储层因蕴藏地热、矿产、油气等资源,受到各国学者的广泛关注. 横波速度是地震AVO分析、储层特征描述和流体识别的必要信息,因受限于采集技术和采集成本等因素,测井资料中常常缺失横波速度信息. 基于统计学岩石物理反演方法和Xu-White岩石物理模型,提出了一种适用于火山岩储层的统计学岩石物理模型横波速度预测方法. 该方法利用Xu-White模型中砂的纵、横波速度和粘土相关孔隙纵横比作为关键岩石物理参数对岩石速度的影响,根据统计学岩石物理反演方法,首先通过已知参考井常规测井资料和Xu-White模型构建关键岩石物理参数的先验分布,其次利用先验分布代替固定参数值初始化Xu-White模型建立统计学岩石物理模型,再次基于贝叶斯反演理论,匹配目标井位实际纵波速度与模拟纵波速度,计算目标井位关键岩石物理参数后验信息,最后利用统计学岩石物理模型和目标井关键岩石物理参数的后验分布反演出目标井的横波速度信息. 将该方法应用于中国东部南堡凹陷5号构造实际测井数据,得到的横波速度预测结果优于常规方法,证明了该方法的有效性和准确性. 研究将为火山岩储层的后续勘探开发提供更准确的横波速度资料.
火山岩储层 / 横波速度预测 / Xu-White模型 / 统计学岩石物理模型 / 贝叶斯反演 / 地球物理
volcanic reservoir / S-wave velocity prediction / Xu-White model / statistical rock-physics model / bayesian inversion / geophysics
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中国地质调查项目(DD20221638)
中国地质调查局基本科研项目(AS2022J04)
中国地质调查局基本科研项目(AS2020J02)
中国地质调查局基本科研项目(AS2020P01)
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