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.

天然裂缝控制着含水层或油藏的渗透率，因此，裂缝区域的发现和特征是地震调查的主要挑战。任何储层表征的主要问题之一是预测流体对弹性特性影响的能力。在裂缝性多孔储层中，饱和流体对岩石弹性性质的影响是复杂的，因为流体会影响岩石的弹性各向异性。在这种非均质多孔介质中，裂缝和流体流动引起的尺度的存在是地震波弥散和衰减的原因。该项目的目的是建立一个完整描述有效弹性特性的理论模型和估计裂缝渗透率的方法。该模型基于Biot的孔隙弹性理论，将裂缝建模为高度柔顺的非均质。应用波在非均质多孔材料中的传播方法，对孔隙和裂缝间由波致流体流动引起的衰减和频散进行了量化。这就产生了裂缝和本底渗透率的估计，并将在碳酸盐岩含水层的现场数据上进行验证。我们提出的方法的结果可以极大地帮助钻井的规划和决策，钻井是水和油气勘探中最昂贵的部分之一。