应力-应变过程中海底沉积物微结构变化对其声速的影响
The influence of microstructure changing of seafloor sediments on its sound velocity in the stress-strain course
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摘要: 阐述了对海底沉积物样品在应力-应变过程中进行同步声学测量的实验工具及方法,分析了采自南海45个站位的海底沉积物样品的实验数据资料,结果表明,沉积物颗粒越粗、孔隙越小、无侧限抗压强度越大,声速越高.沉积物样品在受力应变过程中,声速具有明显的随应力而变化的特征.进一步探讨了不同应变阶段沉积物的声学特征以及应力所导致沉积物微结构变化对其声速的影响过程,这一研究将在石油地质测井和海底工程基底稳定性评价等方面具有重要应用意义.Abstract: Test tools and method of synchronizing acoustic measure at the stress-strain course for sea floor sediments are expatiated on,and the test data of 45 sediment samples which sampled from sea floor in South China Sea are analysed.The result shows that the more sediment grain course,the more porosity small,and the bigger unconfined compression strength,the more sound velocity high.In the stress-strain course,the sediment sound velocity has obvious variance as the stress changes.Acoustic characteristics of sediments in strain phases and the course of influence of sediment microstructure variance on its sound velocity are discussed.This study will have important significance for surveying well of petroleum geology and evaluating base stabilization of sea floor engineering.
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Key words:
- sea floor sediments /
- stress-strain /
- microstructure feature /
- sound velocity /
- compression strength
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