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首页> 外文期刊>Geophysics >Correlations between seismic parameters, EM parameters, and petrophysical/petrological properties for sandstone and carbonate at low water saturations
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Correlations between seismic parameters, EM parameters, and petrophysical/petrological properties for sandstone and carbonate at low water saturations

机译：低含水饱和度下砂岩和碳酸盐岩的地震参数，EM参数与岩石物理/岩石学特性之间的相关性

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摘要

Empirical relations are found between measured petrophysical/petrologic, seismic, and electrical properties of sandstone and carbonate samples by least-squares fitting at room pressure and ambient saturation. The measured parameters include porosity (φ), fluid permeability (k), clay content (C), grain density (ρ_g), bulk density (ρ_b), P-wave velocity (V_p), electrical conductivity (σ), and dielectric constant (κ). The samples are from reservoir analog sites in the Ferron Sandstone in central Utah and the Ellenburger carbonate in central Texas. Crossplots and regression analysis are done separately for the sandstone and the carbonate samples. For the sandstone samples, predictions with correlation coefficients (R~2) greater than 0.75 include ρ_b from φ, ln k from φ and C, κ from ln k and φ, κ from ρ_b and C, and κ from ln k. Predictions with 0.65 < R~2 < 0.75 include κ from V_p and ρ_b, κ from V_p and φ, V_p from ln k and C, κ from ln φ, and κ from ρ_b. In general, σ is difficult to predict, with the best R~2(0.48) obtained in a prediction of σ from ln k. Relationships for the carbonate samples are generally less reliable, which is attributed to a complex history of multiple phases of karsting and burial. The largest R~2 values obtained are 0.67 for prediction of σ from κ, and 0.36 for prediction of σ from ρ_g. All the other R~2 values are ≤0.19. Both the sandstone and the carbonate data show κ-φ relations with negative coefficients, rather than positive as predicted by Archie's law, because of the very low water saturations. In the sandstone, the water connectivity is reduced with increasing grain surface area (with increasing φ and k), so σ decreases. In the carbonate, a correlates with the degree of dolomitization, and the water content is too low to contribute to σ.
机译：通过在室温和环境饱和条件下进行最小二乘拟合，可以在砂岩和碳酸盐岩样品的岩石物理/岩石学，地震学和电学性质之间找到经验关系。测量的参数包括孔隙率（φ），流体渗透率（k），粘土含量（C），颗粒密度（ρ_g），堆积密度（ρ_b），P波速度（V_p），电导率（σ）和介电常数（κ）。样品来自犹他州中部Ferron砂岩和德克萨斯州中部Ellenburger碳酸盐岩的储层模拟地点。分别对砂岩和碳酸盐样品进行交叉绘图和回归分析。对于砂岩样品，相关系数（R〜2）大于0.75的预测包括：来自φ的ρ_b，来自φ和C的ln k，来自ln k和κ的κ，来自ρ_b和C的κ，来自ln k的κ。 0.65

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  • 来源
    《Geophysics》 |2003年第3期|p.871-883|共13页
  • 作者

    Adam P. Koesoemadinata; George A. McMechan;

  • 作者单位

    University of Texas at Dallas, Center for Lithospheric Studies, P.O. Box 830688, Richardson, Texas 75083-0688;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
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