特种油气藏2025，Vol.32Issue(3)：47-56,10.DOI:10.3969/j.issn.1006-6535.2025.03.006
延川地区盒8段储层溶蚀特征及其对物性的影响
Dissolution characteristics and impact on properties of the He 8 Reservoirs in the Yanchuan Area
摘要
Abstract
To address the unclear impact of dissolution on the properties of the He 8 Reservoir in the Yanchuan Area of the Ordos Basin,this study used mercury injection,porosity and permeability tests,core observation,thin-sec-tion identification,and scanning electron microscopy to analyze the development characteristics of He 8 sandstone reservoir dissolution and its impact on reservoir properties.The results show that the He 8 Member is a typical ultra-low-porosity,tight reservoir divided into three types:quartz sandstone,lithic quartz sandstone,and lithic sand-stone.The reservoir has undergone intense diagenesis,with dissolution being the main factor for secondary pore for-mation and property enhancement.All three reservoir types experienced acidic dissolution during the late early dia-genetic stage B to the middle diagenetic stage A.Quartz sandstone reservoirs,with low soluble components and weak dissolution,mainly have intergranular pores.Lithic quartz sandstone,strongly dissolved,forms high-quality reservoirs with abundant secondary pores.Lithic sandstone,subjected to strong compaction rock chip deformation resulting in densification of the sandstone,is a tight reservoir.A dissolution development model was established based on sandstone type.The study results offer a significant reference for"sweet spot"differentiation and favorable area prediction in the He 8 tight sandstone reservoir.关键词
溶蚀作用/发育特征/储层物性/盒8段/延川地区/鄂尔多斯盆地Key words
dissolution/development characteristics/reservoir properties/He 8 Member/Yanchuan Area/Ordos Basin分类
能源科技引用本文复制引用
黄杏雨,杜贵超,何雅雯,郭睿良,朱琳,贾文昊,王豪,王凤琴..延川地区盒8段储层溶蚀特征及其对物性的影响[J].特种油气藏,2025,32(3):47-56,10.基金项目
国家自然科学基金"取心保存过程中页岩油轻烃散失动力学机制及规律——以鄂尔多斯盆地长7段为例"(42202175) （42202175）
国家科技重大专项"陆相页岩气成藏主控因素及'甜点'预测"(2017ZX05039-001) （2017ZX05039-001）
