现代地质2024，Vol.38Issue(2)：373-384,12.DOI:10.19657/j.geoscience.1000-8527.2023.102
南华北盆地鹿邑凹陷上古生界煤系地层砂岩储层特征
Sandstone Reservoir Characteristics of the Upper Paleozoic Coal-bearing Strata in Luyi Sag,Southern North China Basin
摘要
Abstract
Sandstone reservoir characteristics of the Upper Paleozoic coal-bearing strata in Luyi Sag are not yet clearly understood,and this hinders the relevant research and exploration deployment of natural gas in this area.In this study,we use analytical methods such as core observation,thin section identification,scanning electron microscopy,mercury intrusion testing,and acoustic emission testing to investigate the characteristics of sand-stone reservoirs and further identify the factors affecting the reservoir development.The study results show that the sandstone reservoirs are dominated by fine and medium-grained and fine lithic quartz sandstone.There are various types of diagenesis,among which compaction and cementation are the ones mostly damaging the reser-voirs,while dissolution and fracturing contribute more to the damaging.The reservoirs are tight ones with ultra-low porosity and ultra-low permeability,and the reservoir spaces are dominated by dissolved pores,intergranular micropores,fractures,with minor residual primary pores and mold pore.The reservoir pores can be divided into three categories based on the structures.Type Ⅰ are good in structures and physical property,but with limited development;type Ⅱ and type Ⅲ are widely developed,but are poor in structures and physical properties.The reservoir development can be affected by many factors and the tectonic setting affecting the reservoirs are in a moderate-depth buried diagenetic environment for a long time;the sedimentary microfacies control its position of the development.The compaction reduces the primary porosity by 22.01％.The organic acid-bearing diage-netic fluids are the main factor promoting the dissolution of unstable components to form the secondary pores;fracturing greatly improves the reservoir permeability but its development scale is limited.This understanding is of great significance to the study of unconventional gas reservoirs in coal-bearing strata,and it provides a key reference for the deployment of relevant exploration in this area.关键词
储层特征/致密化/主控因素/煤系地层/鹿邑凹陷Key words
reservoir characteristics/densification/main controlling factor/coal-bearing stratc/Luyi sag分类
天文与地球科学引用本文复制引用
常海亮,杜春彦,张宏伟,王宏伟,祝朝辉,陈敬轶..南华北盆地鹿邑凹陷上古生界煤系地层砂岩储层特征[J].现代地质,2024,38(2):373-384,12.基金项目
河南省财政地质勘查基金项目(豫国土资发[2016]46号,豫自然资发[2019]22号). （豫国土资发[2016]46号,豫自然资发[2019]22号）
