东北石油大学学报2026，Vol.50Issue(2)：1-20,20.DOI:10.3969/j.issn.2095-4107.2026.02.001
天府气田须家河组四段近源致密砂岩气成藏特征及主控因素
Accumulation characteristics and main controlling factors of near-source tight sandstone gas in the fourth member of Xujiahe Formation in Tianfu Gas Field
摘要
Abstract
The tight sandstone gas reservoirs in the Xujiahe Formation in Tianfu Area of the slope zone were characterized by complex genesis and unclear gas-water distribution,which restricted the subse-quent exploration deployment.Based on the analysis methods of natural gas composition,natural gas carbon isotope,rock extract chromatography,total organic carbon,rock pyrolysis,casting thin section,unconventional porosity and permeability logging,combined with production test data,the gas reservoir characteristics,reservoir-forming geological conditions and main controlling factors of Xujiahe Forma-tion in Tianfu Area were studied.The results showed that the fourth member of Xujiahe Formation(the Xu-4 Member)in Tianfu Gas Field had the gas-water distribution characteristics of north-south division and east-west zoning.The southern area was dominated by gas production,and the northern area was mostly water production or gas-water production.The overall gas-bearing property of the western mar-gin was better than that of the eastern margin.The natural gas in Xu-4 Member was the product of ma-ture-high mature evolution stage of source rock in the upper sub-member of the third member of Xujiahe Formation.The source rocks of the upper third member of Xujiahe Formation were mainly type Ⅲ kero-gen,with large thickness,high organic matter abundance and sufficient hydrocarbon supply capacity.The Xu-4 Member developed intragranular dissolved pores and intergranular dissolved pores,and the o-verall reservoir physical properties in north were better than those in south.Sand body and fault-sand composite transport system were developed in Tianfu Area.The thick carbonaceous shale in the fifth member of Xujiahe Formation(Xu-5 Member)provided good preservation conditions for natural gas ac-cumulation in Xu-4 Member.The tight gas accumulation in Xu-4 Member was controlled by factors such as source-reservoir configuration,reservoir physical properties,transport system and multi-stage fill-ing.The difference in source-reservoir configuration controled the distribution pattern of west gas and east water in the plane of Tianfu Gas Field.Whether the difference of reservoir physical properties in the north and south could control the formation of effective lithologic traps,and the high-quality transport system composed of faults and stably distributed sand bodies provided dominant channels for natural gas migration.Multi-stage filling created a prerequisite for the formation of large-scale gas reservoirs in Xu-4 Member.The southern region had the characteristics of high-quality source-reservoir configuration controls hydrocarbon supply,physical property controls trap type,fault sand transport system helps transport,and multi-stage charging controlled enrichment.The northern region had the characteristics of high-quality source rock supply,vertical fault transport,and low-amplitude structural accumulation.The results provide theoretical support for deepening the understanding of near-source tight sandstone gas accu-mulation and guiding the subsequent exploration and deployment of Xujiahe Formation in Tianfu Area.关键词
近源致密砂岩气/成藏特征/主控因素/须四段/天府气田/四川盆地Key words
near-source tight sandstone gas/accumulation characteristics/main controlling factors/Xu-4 Member/Tianfu Gas Field/Sichuan Basin分类
能源科技引用本文复制引用
杨强,贾敏,李子渊,袁纯,赵正望,张奥博,陈世加,李勇,张洋洋..天府气田须家河组四段近源致密砂岩气成藏特征及主控因素[J].东北石油大学学报,2026,50(2):1-20,20.基金项目
国家自然科学基金项目(41872165) （41872165）
中国石油西南油气田分公司科技项目(20230301-09) （20230301-09）
中国石油西南油气田分公司科研项目(JS2023-036) （JS2023-036）
