Effect of weathered on the pore characteristics of different rocks in coal-bearing strata
Dong Feng, Enke Hou, Xiaoshen Xie, Pengfei Hou, Jiangbo Wei
TL;DR
This study examines how weathering affects the pore structures of rocks in coal-bearing strata, impacting water enrichment and mining safety.
Contribution
The paper introduces a novel analysis of how weathering alters pore characteristics and fractal dimensions in sandstones from coal-bearing strata.
Findings
Weathering increases clay mineral content and changes pore size distribution in sandstones.
Fractal dimensions decrease with increasing particle size across different lithologies.
Weathered rocks show higher macropore prevalence and altered porosity-permeability relationships.
Abstract
This study aims to explore how weathered controls the microscopic pore development of rocks. Siltstones to coarse sandstones were selected from the main rocks of the Jurassic strata of the northern Ordos Basin. The pore structure, mineral composition, the pore size distribution (PSD), porosity, permeability and fractal characteristics of unweathered and weathered rocks were analysed using a combination of X-ray diffraction (XRD), scanning electron microscopy (SEM) and low-field nuclear magnetic resonance (LF-NMR). The study showed that the microstructure of different sandstones has obvious differences, the total porosity and permeability of rocks are usually positively correlated with the grain size of the rock, and the microscopic pore structure of rocks of the same lithology changes from small pore type to large pore type after weathered. The results show that weathered rocks had the…
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Taxonomy
TopicsHydrocarbon exploration and reservoir analysis · Coal Properties and Utilization · Rock Mechanics and Modeling