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The continuity of high-permeability zones in sedimentary deposits.

机译：沉积物中高渗透率带的连续性。

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摘要

Cubic lattice models were used to represent sedimentary deposits and their role as georeservoirs. The percolation of high-permeability zones was studied using both analytical and simulation approaches. The analytical approach was developed for single-scale sedimentary architecture. The approach showed that percolation is affected by cluster spatial correlation and by lattice size. It showed that correlation affects both high-permeability and low-permeability clusters equally, and thus correlation does not likely affect the percolation threshold for infinite lattices. On finite lattices, the analysis showed that the effect of correlation on lowering the percolation threshold can be understood through the truncation of low-permeability cluster-size distributions, without the need for Monte Carlo simulations.;The simulation approach was used to study multiscale, hierarchical sedimentary architecture. A computer code was developed to create a digital model representing hierarchical stratal architecture found in channel-belt deposits. The code uses a geometric-based approach to simulate strata observed over multiple scales (levels). Larger-scale unit types form the bounding surfaces of associations of smaller-scale unit types. The different scales of bounding surfaces were each found to create a finite lattice effect on percolation. When using realistic length distributions, the high-permeability zones percolate across boundaries at all hierarchical levels if volume proportions are above 0.18, as is common. This threshold value is lower than the threshold proportion of 0.3116 required for percolation on the infinite random lattice. Thus, in sedimentary deposits as represented here, percolation in the high-permeability zones is expected.
机译：三次晶格模型用于表示沉积物及其作为地质储层的作用。使用分析和模拟方法研究了高渗透带的渗流。分析方法是为单尺度沉积建筑开发的。该方法表明，渗滤受簇空间相关性和晶格大小的影响。结果表明，相关性同时影响高渗透性和低渗透性团簇，因此相关性不会影响无限晶格的渗透阈值。在有限晶格上，分析表明可以通过截断低渗透性簇大小分布来理解相关性对降低渗透阈值的影响，而无需进行蒙特卡洛模拟。分级沉积构造。开发了计算机代码以创建表示在通道带沉积物中发现的分层地层结构的数字模型。该代码使用基于几何的方法来模拟在多个比例（级别）上观察到的地层。较大单位类型形成较小单位类型的关联的边界面。发现边界表面的不同比例分别对渗滤产生有限的晶格效应。使用实际长度分布时，如果体积比例高于0.18（通常），则高渗透性区域会在所有层次级别的边界上渗透。此阈值低于在无限随机晶格上进行渗滤所需的阈值比例0.3116。因此，在此处所示的沉积沉积物中，高渗透区中的渗滤是可以预期的。

著录项

  • 作者

    Guin, Arijit.;

  • 作者单位

    Wright State University.;

  • 授予单位 Wright State University.;
  • 学科 Engineering Petroleum.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 231 p.
  • 总页数 231
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;环境科学基础理论;
  • 关键词

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