Microscopic pore characteristics of andesite and implication from mineral content:A case study in Huoshiling Formation of Changling fault depression,Songliao Basin  

作　　者：NIU Penghui SHAN Xuanlong REN Xianjun YI Jian LIU Chaoyang XING Jian 

机构地区：[1]College of Earth Sciences,Jilin University,Changchun 130061,China [2]Exploration and Development Research Institute of SINOPEC Northeast Oil and Gas Company,Changchun 130062,China

出　　处：《Global Geology》2022年第2期84-96,共13页世界地质（英文版）

基　　金：Supported by Project of National Natural Science Foundation of China(Nos.41972313,41790453).

摘　　要：In order to study the microscopic pore characteristics of andesite reservoir and the effect of mineral content on the andesite pore,this study takes the andesite of the Huoshiling Formation in Longfengshan of Changling fault depression,Songliao Basin as a subject.The andesite reservoir space was discerned through the observation of cores and casting thin sections.Besides,the pore size distribution of andesites and their mineral contents were quantitatively characterized by high-pressure mercury injection,nitrogen adsorption and XRD,respectively.The results show that:(1)There are various types of reservoir space in andesites,including vesicles,amygdule,intergranular pores,matrix dissolution pores and dissolution pores of amygdala,and three types of fractures including dissolution,structural and explosion fractures.(2)The pore size distribution of andesite is complex.The main pore size of andesite is mid-pore(10-20 nm)with some large-pores(>50 nm).Mid-pore and large-pore provide the main specific surface area,which are the main space for gas storage.(3)The andesite reservoir space in the study area is mainly controlled by dissolution,as supported by the relationship between the change of mineral content and porosity evolution.The porosity of andesites decreases with the increase of quartz and chlorite content,but increases with the increase of soluble mineral,e.g.,feldspar content.

关 键 词：ANDESITE microscopic pore high pressure mercury injection nitrogen adsorption XRD 

分 类 号：P618.13[天文地球—矿床学]