Fracture permeability estimation using seismic attenuation

使用地震衰减估算裂缝渗透率

• 批准号: 24470300
• 负责人: Dr. Tobias Müller
• 金额: --
• 依托单位: ARRC Australian Resources Research Centre
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/24470300?language=en
• 关键词: Fracture; permeability; estimation; using; seismic

Natural fractures control the permeability of aquifers or oil reservoirs, and hence the ability to find and characterize fractured areas represents a major challenge for seismic investigations. One of the main issues in the characterization of any reservoir is the ability to predict the effect of fluids on elastic properties. In fractured porous reservoirs the effect of the saturating fluid on elastic properties is complex, as fluids affect elastic anisotropy of the rock. The existence of scales caused by fractures and fluid flow in such heterogeneous porous media are the reasons for dispersion and attenuation of seismic waves. The aim of this project is to develop a theoretical model for the complete description of the effective elastic properties and a method for estimation of fracture permeability. The model is based on Biot s theory of poroelasticity and fractures are modeled as highly compliant heterogeneties. Applying methods for the wave propagation in heterogeneous porous materials, attenuation and dispersion, caused by wave-induced fluid flow between pores and fractures is quantified. This yields to the estimation of fracture and background permeability, which will be validated on field data from a carbonate aquifer. Outcomes from our proposed methodology can significantly help in planning and decision making in drilling, which is one of the most expensive parts of water and hydrocarbon exploration.

天然断裂控制含水层或油库的渗透率，因此找到和表征裂缝区域的能力是地震研究的主要挑战。表征任何储层的主要问题之一是能够预测流体对弹性特性的影响。在断裂的多孔储层中，饱和流体对弹性特性的影响很复杂，因为流体会影响岩石的弹性各向异性。在这种异质多孔培养基中骨折和流体流动引起的量表的存在是分散和衰减地震波的原因。该项目的目的是开发一个理论模型，以完整描述有效的弹性特性和估计断裂通透性的方法。该模型基于Biot的毛弹性理论，裂缝被建模为高度兼容的异性发育。量化了在异质多孔材料中应用波传播的方法，由毛孔和裂缝之间波动诱导的流体流动引起的衰减和分散体。这得出了断裂和背景渗透率的估计，这将在碳酸盐含水层的现场数据上进行验证。我们提出的方法学的结果可以极大地帮助钻探计划和决策，这是水和碳氢化合物勘探的最昂贵部分之一。