Influence of Acid Treatment on Pore Structure and Fractal Characterization of a Tight Sandstone:A Case Study from Wudun Sag,Dunhuang Basin

作     者：GENG Weile WANG Jiandong ZHANG Xuecai WANG Jun DONG Chenqiang ZHOU Guangqing HUANG Gun LI Lin GENG Weile;WANG Jiandong;ZHANG Xuecai;WANG Jun;DONG Chenqiang;ZHOU Guangqing;HUANG Gun;LI Lin

作者机构：State Key Laboratory of Coal Mine Disaster Dynamics and ControlSchool of Resources and Safety EngineeringChongqing UniversityChongqing 400030China School of Safety and Management EngineeringHunan Institute of TechnologyHengyangHunan 421002China Oil and Gas Exploration Management CentreShengli Oilfield CompanySINOPECDongyingShandong 257000China Xinjiang Xinchun Petroleum Development Company LimitedSINOPECDongyingShandong 257000China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2023年第97卷第2期

页      面：562-572页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0816[工学-测绘科学与技术] 082002[工学-油气田开发工程] 

基　　金：supported by the National Natural Science Foundation of China(51674049,52074044,and 51874053) the Scientific Research Foundation of Hunan Provincial Education Department,China(22B0854) 

主　　题：pore structure acid treatment full pore size distribution fractal dimension tight sandstone 

摘      要：In this study,X-ray diffraction,N_(2)adsorption(N_(2)A),and mercury intrusion(MI)experiments were used to investigate the influence of acid treatment on pore structure and fractal characterization of tight *** results showed that acid treatment generated a certain number of ink-bottle pores in fine sandstone,aggravated the ink-bottle effect in the sandy mudstone,and transformed some smaller pores into larger *** the acid treatment,both the pore volume in the range of 2–11 nm and 0.271–8μm for the fine sandstone and the entire pore size range for the sandy mudstone significantly *** dissolution of sandstone cement causes the fine sandstone particles to fall off and fill the pores;the porosity increased at first but then decreased with acid treatment *** fractal dimension obtained using the Frenkel-Halsey-Hill model was positively correlated with acid treatment ***,the total fractal dimensions obtained by MI tests showed different changes with acid treatment time in fine sandstone and sandy *** results provide good guiding significance for reservoir acidification stimulation.