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

作　　者：Mutian Qin Shuyun Xie Jianbo Zhang Tianfu Zhang Emmanuel John M.Carranza Hongjun Li Jiayi Ma 

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources(GPMR),School of Earth Sciences,China University of Geosciences,Wuhan 430078,China [2]School of Geography and Information Engineering,China University of Geosciences,Wuhan 430074,China [3]PetroChina Hangzhou Institute of Petroleum Geology,Hangzhou 310023,China [4]Geological Sciences,School of Agricultural,Earth and Environmental Sciences,University of KwaZulu-Natal,Westville 3629,South Africa [5]Dagang Oilfield Company,China National Petroleum Corporation,Tianjin 300280,China

出　　处：《Journal of Earth Science》2021年第4期799-808,共10页地球科学学刊（英文版）

基　　金：supported by the Natural Science Foundation of China(No.41872250);supported by PetroChina Dagang Oilfield Company“Study on Igneous Rock Distribution and Reservoir Prediction in Dagang Exploration Area”(No.DGTY-2018-JS-408);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).

摘　　要：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.

关 键 词：volcanic vesicles fractal and multifractal microscopic morphology HETEROGENEITY X-CT imaging 

分 类 号：P618.13[天文地球—矿床学]