中煤阶煤声波速度对孔隙度的响应
Response of Acoustic Wave Velocity to Porosity of Medium Rank Coal
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摘要: 以西山煤田古交矿区中煤阶煤为例，研究了中煤阶煤加载过程中煤样孔隙度和声波速度的变化及其相互关系。研究结果表明：随着加载过程中围压的增大，煤样的孔隙度以指数形式减小，并且不同方向孔隙度对围压变化的敏感程度不同；煤样声波速度随围压增大表现出非线性增大趋势，且煤样具有波速各向异性；在前人研究的基础上，利用孔隙度及波速与围压的关系式，通过围压建立波速与孔隙度的关系，提供了1种适用于古交矿区利用波速数据近似预测煤储层孔隙度的方法。Abstract: We study the changes and relation of porosity and acoustic wave velocity during loading with the medium rank coal from Gujiao Mine Area of Xishan Coalfield. The research results show that with the increase of confining pressure, the coal samples porosity decrease exponentially. And the porosity in different directions has different stress sensitivity during confining pressure changing. With the increasing of confining pressure, the nonlinear increasing of the acoustic wave velocity in the coal samples can be got. And velocity anisotropy can be found in coal samples. On the basis of previous studies, the relationship between wave velocity and porosity is founded using confining pressure state as a bridge. It can provide a methodology to estimate approximately porosity from acoustic wave velocity to Gujiao Mine Area.
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Keywords:
- medium rank coal /
- confining pressure /
- porosity /
- acoustic wave velocity /
- anisotropy
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