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

被引：3

作者：

Geng, Weile ^{[1
,2
]}

Wang, Jiandong ^{[3
]}

Zhang, Xuecai ^{[3
]}

Wang, Jun ^{[4
]}

Dong, Chenqiang ^{[4
]}

Zhou, Guangqing ^{[4
]}

Huang, Gun ^{[1
]}

LI, Lin ^{[1
]}

机构：

[1] Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China

[2] Hunan Inst Technol, Sch Safety & Management Engn, Hengyang 421002, Hunan, Peoples R China

[3] Shengli Oilfield Co, Oil & Gas Explorat Management Ctr, SINOPEC, Dongying 257000, Shandong, Peoples R China

[4] Xinjiang Xinchun Petr Dev Co Ltd, SINOPEC, Dongying 257000, Shandong, Peoples R China

来源：

ACTA GEOLOGICA SINICA-ENGLISH EDITION | 2023年 / 97卷 / 02期

基金：

中国国家自然科学基金;

关键词：

pore structure; acid treatment; full pore size distribution; fractal dimension; tight sandstone; INJECTION CAPILLARY-PRESSURE; COAL; PERMEABILITY; POROSITY; CHINA;

D O I：

10.1111/1755-6724.15008

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

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 sandstones. The 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 ones. After the acid treatment, both the pore volume in the range of 2-11 nm and 0.271-8 mu m for the fine sandstone and the entire pore size range for the sandy mudstone significantly increased. The 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 time. The fractal dimension obtained using the Frenkel-Halsey-Hill model was positively correlated with acid treatment time. However, the total fractal dimensions obtained by MI tests showed different changes with acid treatment time in fine sandstone and sandy mudstone. These results provide good guiding significance for reservoir acidification stimulation.

引用

页码：562 / 572

页数：11

共 33 条

[1] Pore Structure Characterization of Clay Minerals in the Lower Karamay Formation Conglomerate Reservoir in the Junggar Basin and its Impact on Hydrocarbon Storage and Seepage [J].