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Petrophysical Texture Heterogeneity of Vesicles in Andesite Reservoir on Micro-Scales

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Abstract

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.

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Acknowledgments

This study was jointly supported by the Natural Science Foundation of China (No. 41872250). The project was also supported by PetroChina Dagang Oilfield Company “Study on Igneous Rock Distribution and Reservoir Prediction in Dagang Exploration Area” (No. DGTY-2018-JS-408) and China National Petroleum Corporation Major Science and Technology Program “Research and Application of Key Technologies for Increasing Efficiency, Storing and Stabilizing Production in Dagang Oilfield” (No. 2018E-11). The final publication is available at Springer via https://doi.org/10.1007/s12583-021-1409-z.

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Correspondence to Shuyun Xie.

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Qin, M., Xie, S., Zhang, J. et al. Petrophysical Texture Heterogeneity of Vesicles in Andesite Reservoir on Micro-Scales. J. Earth Sci. 32, 799–808 (2021). https://doi.org/10.1007/s12583-021-1409-z

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  • DOI: https://doi.org/10.1007/s12583-021-1409-z

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