成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：301-314,14.DOI:10.12474/cdlgzrkx.2024010406
松辽盆地长岭断陷深层凝灰质碎屑岩储层特征及致密化机理
Reservoir characteristics and densification mechanism of deep tuffaceous clastic rocks in the Changling Fault Depression,Songliao Basin
摘要
Abstract
To clarify the reservoir characteristics and densification mechanism of deep tuffaceous clastic rocks in Shenzijing Sag,sandstone reservoirs in the first member of the Yingcheng Formation and Shahezi Formation are taken as the research target.The densification characteristics,controlling factors,and formation time of the deep tuffaceous clastic reservoir and its relationship with the gas filling period are discussed from the aspects of petrology,reservoir characteristics,diagenetic types,and reservoir formation mechanism.The methods used here consist of carbon and oxygen stable isotope analysis,fluid inclusion temperature measurements,and in situ microprobe measurements.The results show that the reservoir lithology in the first member of the Yingcheng Formation and Shahezi Formation is dominated by mixed tuffaceous conglomerate and tuffaceous medium-fine sandstone,which contain mainly secondary pores with a few microfractures.Cementation is a key factor in the densification of the reservoir.Carbonate cement is the most important type of cement present,which can be divided into three stages according to the cementation order.The sandy conglomerate reservoir of the first member of the Yingcheng Formation began to densify around 80 Ma,and the gas was mainly charged 90～80 Ma,reflecting the characteristics of gas accumulation followed by densification.The sandstone reservoir of the Shahezi Formation began to densify around 90 Ma,and the natural gas of the second member of the Shahezi Formation mainly charged 98～88 Ma,i.e.,they occurred around the same time.This means that there are two charging processes:gas accumulation followed by densification and simultaneous gas accumulation and densification.This study deepens our understanding of the densification mechanism and accumulation in deep tuffaceous clastic reservoirs and can be used as a reference for the exploration and development of deep tight gas reservoirs.关键词
致密化机理/凝灰质碎屑岩储层/神字井洼槽/长岭断陷/松辽盆地Key words
densification mechanism/tuffaceous clastic reservoir/Shenzijing Sag/Changling Fault Depression/Songliao Basin分类
地质学引用本文复制引用
周龙飞,郭小波,沈霞,李立立,薛松,高劲,丁超,谷晓强..松辽盆地长岭断陷深层凝灰质碎屑岩储层特征及致密化机理[J].成都理工大学学报（自然科学版）,2025,52(4):301-314,14.基金项目
中国石油天然气集团公司"十四五"前瞻性基础性重大科技项目(2021DJ0205) （2021DJ0205）
陕西省重点基金(2023-JC-ZD19) （2023-JC-ZD19）
陕西省教育厅项目(20JS115) （20JS115）
西安石油大学研究生创新与实践能力培养项目(YCS22113095). （YCS22113095）
