It is of great significance to study the spatial distribution patterns and petrophysical complexity of volcanic vesicles which determine whether the reservoir spaces of the volcanic rocks can accumulate oil and gas and enrich high yields or not. In this paper, the digital images of three different textures of vesicular andesite samples, including spherical vesicular andesite, shear deformation vesicular andesite, and secondary filling vesicular andesite, are obtained by microscopic morphology X-CT imaging technology. The spatial micro-vesicle heterogeneity of vesicular andesite samples with different textures is quantitatively analyzed by fractal and multifractal methods such as box-counting dimension and the moment method. It is found that the shear stress weakens the spatial homogeneity since vesicles rupture are accelerated, elongated directionally, and connected with one another under the strain; the secondary filling breaks the vesicles, which significantly enhances the spatial heterogeneity. In addition, shear stress and secondary filling increase the complexity of vesicle microstructures characterized by different fractal and multifractal parameters. These conclusions will provide important theoretical and practical insights into understanding the degassing of volcanic rocks and prediction of high-quality volcanic reservoirs.

研究火山囊泡的空间分布格局和岩石物理复杂性，对于决定火山岩储集空间能否成藏油气、富集高产具有重要意义。本文通过显微形态学X-CT成像技术获得球状水泡安山岩、剪切变形水泡安山岩和次生充填水泡安山岩三种不同质地水泡安山岩样品的数字图像。采用计箱维数、矩量法等分形和多重分形方法定量分析了不同质地水泡安山岩样品的空间微水泡异质性。发现由于囊泡破裂加速，剪切应力削弱了空间均匀性，定向拉长，并在应变下相互连接；二次填充打破了囊泡，显着增强了空间异质性。此外，剪切应力和二次填充增加了以不同分形和多重分形参数为特征的囊泡微结构的复杂性。这些结论将为理解火山岩脱气和预测优质火山岩储层提供重要的理论和实践见解。