一种新的以方向为导向的方法,通过经验性岩石物理关系来预测剪切波速度,使用地球统计学分析
Esmael Makarian1, Maryam Mirhashemi1, Ayub Elyasi2
1Department of Mining Engineering, Sahand University of Technology, Tabriz, 94173-71946, Iran.
Scientific reports
|November 14, 2023
概括
这项研究引入了一种新的地缘统计方法,用于估计碳酸盐水库中的剪切波速度 (Vs). 使用密度的方向导向方法显著提高了比传统的经验岩石物理关系更准确的预测准确性.
科学领域:
- 地质物理学 地质物理学
- 石化物理学 石化物理学
- 储水库工程 储水库工程
背景情况:
- 剪切波速度 (Vs) 是一种关键参数,用于描述碳化合物储库中的岩石特性和流体含量.
- 传统的实证岩石物理关系 (ERR) 往往在准确预测Vs方面表现出局限性,特别是在碳酸盐水库等复杂的地质构造中.
- 地理统计方法 (GM) 为空间建模和预测提供了一个强大的框架,可能增强Vs估计.
研究的目的:
- 设计和评估一种新的以方向为导向的地理统计方法,用于估计使用碳酸盐水库中的密度来估计剪切波速度 (Vs).
- 为了比较开发的地质统计方法与传统的实证岩石物理关系的性能.
- 用各种统计基准来评估拟议方法的准确性和稳定性.
主要方法:
- 在目标井 (井A) 中使用四个选定的实证岩石物理关系 (ERR) 估计Vs.
- 应用地理统计方法,包括普通Kriging (OKr),交叉验证 (CVm) 和杰克刀 (JKm),以改善使用密度的Vs估计.
- 使用地质日志数据,包括密度和现有的VS测量,来自碳酸盐储中的三个碳化合物井 (A,B和C).
主要成果:
- 格林伯格和卡斯塔尼亚的ERR在测试的经验方法中表现最好 (R2=0.8104,相关性=0.90).
- 地理统计方法,特别是交叉验证 (CVm),在与一些原始Vs数据进行训练时,证明了对Vs估计准确度的提高 (R2=0.8865,相关性=0.94).
- 杰克-刀法 (JKm),在没有目标井的原始Vs数据的情况下应用时,也产生了出色的结果 (R2=0.8503,相关性=0.922),突出了该方法的稳定性.
结论:
- 开发的以方向为导向的地质统计方法显著优于传统的实证岩石物理关系,用于在研究的碳酸盐水库中对Vs的估计.
- 地质统计方法,特别是当结合密度数据时,与传统技术相比,为Vs预测提供了更准确和更强大的方法.
- 这项研究证实了地理统计建模在复杂的地质环境中增强剪切波速度估计的巨大潜力.
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