Predicting sandstone water abundance using seismic dispersion attribute inversion: A case study of Yuwang coal mine, China

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geophysical Prospecting Pub Date : 2024-04-11 DOI:10.1111/1365-2478.13515
Jiasheng She, Guangui Zou, Fei Gong, Hu Zeng, Yanhai Liu, Deliang Teng, Jinxin Li
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Abstract

Predicting the water abundance of coal-bearing strata is crucial for ensuring mining safety. However, owing to the dispersion and attenuation characteristics caused by pore fluid flow, it is difficult to estimate the water abundance of coal seam roof aquifers using seismic data. To overcome this challenge, we provide the relationship between the frequency-dependent seismic wave velocity and water saturation based on the Chapman fracture model and the mixing fluid model. We propose a seismic dispersion attribute technique that can use dispersion information as an indicator of water abundance. Numerical experiment results show that the water saturation of the sandstone aquifer is positively correlated with the dispersion attribute. The results of low-frequency rock physical experiments are roughly consistent with those predicted by the model for the given parameters. Using seismic dispersion attribute inversion and the frequency slice wavelet transform method, we predicted the water abundance of sandstone in the coal seam roof of the Yuwang coal mine in Yunnan Province, China. The predicted sandstone water abundance was compatible with the actual water-rich scenario observed in well logs and downhole drilling in the study area. Therefore, the method proposed herein has the potential to quantitatively determine the water abundances of sandstone aquifers in coal seam roofs.

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利用地震频散属性反演预测砂岩水丰度:中国禹王煤矿案例研究
预测含煤地层的丰水性对于确保采矿安全至关重要。然而,由于孔隙流体流动造成的弥散和衰减特性,很难利用地震数据估算煤层顶板含水层的含水丰度。为了克服这一难题,我们基于查普曼断裂模型和混合流体模型,提供了随频率变化的地震波速度与含水饱和度之间的关系。我们提出了一种地震频散属性技术,可以利用频散信息作为水丰度的指标。数值实验结果表明,砂岩含水层的含水饱和度与频散属性呈正相关。低频岩石物理实验结果与模型对给定参数的预测结果基本一致。利用地震频散属性反演和频率切片小波变换方法,我们预测了中国云南省禹王煤矿煤层顶板砂岩的含水丰度。预测的砂岩富水度与研究区域内测井和井下钻探观测到的实际富水情况相符。因此,本文提出的方法具有定量测定煤层顶板砂岩含水层丰水性的潜力。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
期刊最新文献
Issue Information Simultaneous inversion of four physical parameters of hydrate reservoir for high accuracy porosity estimation A mollifier approach to seismic data representation Analytic solutions for effective elastic moduli of isotropic solids containing oblate spheroid pores with critical porosity An efficient pseudoelastic pure P-mode wave equation and the implementation of the free surface boundary condition
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