用于上覆岩层鹅卵石源定位的波速模型构建与实验验证

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-09-10 DOI:10.1016/j.jappgeo.2024.105515
Linli Zhou , Baoxin Jia , Xinyang Bao , Hao Chen , Kenan Zheng
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引用次数: 0

摘要

煤层上覆岩石的地质结构复杂,这是煤炭开采改变了沉积地层原有分层结构的结果。为了提高在这种错综复杂的地质构造中进行微地震源定位的准确性,利用斯涅尔定律并假设介质均质,根据地层内部的自然划分,构建了 "三区 "岩层的波速模型。该模型考虑了岩石变形和断裂发育的影响,从而推导出了微地震波传播路径和传播时间计算公式。此外,还定义了等效波速的概念。使用类似材料进行了室内模拟试验,以建立岩床地质模型。通过比较等效波速理论值和实测值之间的误差,评估实施岩层波速模型前后的定位效果,以及验证模型的可行性,证明了建立基于地层结构特征的波速模型对于提高微震源定位的准确性至关重要。值得注意的是,随着微地震波在岩层中传播路径的增加,等效波速也随之降低。地层中的波速结构表现出不均匀性,等效波速的理论值和测量值之间的相对误差不超过 10%。将这一已建立的波速模型纳入定位方法后,定位精度大幅提高了 58.57%。
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Construction and experimental verification of wave velocity model for source location in goaf overlying rock strata

The geological structure of the goaf overlying rock is complex, a consequence of coal mining that has modified the original stratified structure of the sedimentary strata. To enhance the accuracy of microseismic source location in such intricate geological formations, a wave velocity model for the “three zones” goaf was constructed based on natural divisions within the strata using Snell's law and assuming a homogeneous medium. The model took into account the effects of rock deformation and fracture development, enabling the derivation of formulas for microseismic wave propagation path and travel time calculation. Additionally, the concept of equivalent wave velocity was defined. An indoor simulation test using similar materials was conducted to establish a geological model of the goaf. By comparing the errors between the theoretical and measured values of equivalent wave velocity, assessing the locating effects before and after implementing the wave velocity model of the goaf, and verifying the feasibility of the model, it was demonstrated that establishing a wave velocity model based on the characteristics of the strata structure was crucial for improving the accuracy of the microseismic source location. Notably, as the propagation path of microseismic waves in the goaf increased, the equivalent wave velocity decreased. The wave velocity structure in the goaf exhibited nonuniformity, with the relative error between the theoretical and measured values of equivalent wave velocity being limited to 10 %. The incorporation of this established wave velocity model into the location method resulted in a substantial 58.57 % increase in locating accuracy.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
期刊最新文献
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