Finite element modeling of microscale compaction localization of porous limestone under different confining stresses

HUANG Wanying; LIU Jie

doi:10.13471/j.cnki.acta.snus.ZR20240150

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Finite element modeling of microscale compaction localization of porous limestone under different confining stresses

Research articles | 更新时间：2024-11-07

- Finite element modeling of microscale compaction localization of porous limestone under different confining stresses
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 63, Issue 5, Pages: 28-37(2024)
- 作者机构：
  
  1.中山大学地球科学与工程学院，广东珠海 519082
  2.南方海洋科学与工程广东省实验室（珠海） / 广东省地质过程与矿产资源探查重点实验室，广东珠海 519082
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.ZR20240150
  CLC： P584
- Published：25 September 2024，
  
  Published Online：12 July 2024，
  
  Received：08 May 2024，
  
  Accepted：04 June 2024
- 稿件说明：
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黄宛莹,刘洁.微观尺度多孔岩石压实带形成与围压关系的数值模拟实验[J].中山大学学报(自然科学版)(中英文),2024,63(05):28-37.

HUANG Wanying,LIU Jie.Finite element modeling of microscale compaction localization of porous limestone under different confining stresses[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(05):28-37.
黄宛莹,刘洁.微观尺度多孔岩石压实带形成与围压关系的数值模拟实验[J].中山大学学报(自然科学版)(中英文),2024,63(05):28-37. DOI： 10.13471/j.cnki.acta.snus.ZR20240150.

HUANG Wanying,LIU Jie.Finite element modeling of microscale compaction localization of porous limestone under different confining stresses[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(05):28-37. DOI： 10.13471/j.cnki.acta.snus.ZR20240150.

摘要

不同于典型的拉张和剪切破坏，多孔岩石的非弹性压实行为是岩石变形的另一种重要表现。在压应力的作用下，高孔隙率沉积岩形成局部孔隙度和渗透率显著降低的压实带，这不仅与多孔岩石脆-韧性转变过程的中间状态有关，还会对储层流体输运性能产生重要影响。为了探究围压及岩石初始孔隙结构对局部压实的影响，本文基于莱塔灰岩样品三轴压缩实验的原位动态同步加速器X射线CT图像，建立了具有岩石真实孔隙结构的有限元模型并进行了不同围压下的弹塑性数值模拟实验。结果表明，在20~60 MPa围压下样品均发生非均匀变形；随着围压的增加，样品内部的轴向局部压缩将被抑制，同时径向局部压缩开始增强，并使得压实带内大部分的节点脱离准单轴压缩状态，不利于压实带的发展。

Abstract

Different from the tensile and shear failures，the inelastic compaction of porous rocks is another important performance of rock deformation. Under compressive stress，high-porosity sedimentary rocks form compaction bands with significantly reduced porosity and permeability. This is not only related to the intermediate regime of the brittle-ductile transition of porous rocks but also has important impacts on the engineering application of fluid flow in reservoirs. To explore the influence of confining pressure and the initial pore structure on compaction localization，we establish a finite element model with the complex pore structure of the rock based on the

in situ

synchrotron CT images of the triaxial experiment of a Leitha limest

one sample and conduct elastoplastic numerical simulations under different confining pressures. Our results show that the samples undergo heterogeneous deformation under the confining pressure of 20 to 60 MPa. As the confining pressure increases，the axial local compression inside the sample is restrained，while the radial local compression is promoted. Most of the nodes in the compaction band have the trend of being away from the quasi-uniaxial compression state under high compression stress，which restricts the development of compaction bands.

关键词

岩石CT有限元数值模拟多孔岩石压实带围压

Keywords

CT images of rocksfinite element simulationporous rockscompaction bandsconfining pressure

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LIU Jie

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Southern Laboratory of Ocean Science and Engineering / Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes

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