天然气勘探与开发2025，Vol.48Issue(4)：1-14,14.DOI:10.12055/gaskk.issn.1673-3177.2025.04.001
准噶尔盆地东道海子凹陷及其周缘深层油气成因与来源
Origin and source of deep oil and gas in Dongdaohaizi Sag and its periphery,Junggar Basin
摘要
Abstract
To clarify the source and accumulation model of deep oil and gas in the Dongdaohaizi Sag of the Junggar Basin,the geochemical characteristics of source rocks and hydrocarbons in sag,slope,and peripheral uplift zones were comparatively investigated through maceral analysis,n-alkane and biomarker testing,and fluid inclusion homogenization temperature measurement.The research results are obtained in four aspects.(i)The Carboniferous source rocks in the Dongdaohaizi Sag are mainly composed of humic kerogen with remarkable potential of gas generation,while the source rocks in the Middle Permian Lower Wuerhe Formation are represented by hybrid kerogen capable of both oil and gas generation.Moreover,the sag zone is found with a much higher thermal maturity of organic matters(Ro)than the uplift zone.(ii)The crude oil in the eastern Dinan Uplift and Baijiahai Uplift is a mixture of mature oil from the Lower Wuerhe Formation and the Carboniferous crude oil,with natural gas primary consisting of over-mature Carboniferous dry gas,mixed with minor Permian natural gas.The crude oil in the slope and sag zones mainly originates from mature to highly-mature oil from the Lower Wuerhe Formation,mixed with minor Carboniferous oil,while the natural gas is a mixture from the Lower Wuerhe Formation and the Carboniferous.(iii)There are three phases of hydrocarbon charging in the sag and slope zones(i.e.,Early Triassic-Middle Triassic,Late Triassic-Middle Jurassic,and Late Jurassic-Early Cretaceous),and two phases of charging in the uplift zone.And(iv)the thickness and total organic carbon content of source rocks increase from the uplift zone toward the sag zone,with the mudstone thickness of the Lower Wuerhe Formation in the sag zone reaching 536 m,and the biomarkers reveal that the input of aquatic organisms is more significant in the sag zone.In conclusion,the deep oil and gas accumulation in the Dongdaohaizi Sag is controlled by multi-phase tectonic activities,and the high-maturity source rocks and fault systems in the sag zone jointly dominate the differential distribution of hydrocarbons,providing a referential"source-fault-reservoir"coupled accumulation model for deep oil and gas exploration in the interior basin.关键词
准噶尔盆地/东道海子凹陷/深层油气/烃源岩/生物标志化合物/油气来源/油气成藏模式/流体包裹体Key words
Junggar Basin/Dongdaohaizi Sag/Deep oil and gas/Source rock/Biomarker/Oil and gas source/Hydrocarbon accumulation model/Fluid inclusion分类
能源科技引用本文复制引用
郭瑞超,王娟,贾凡建,范婕,罗力元,向忠强,李勇..准噶尔盆地东道海子凹陷及其周缘深层油气成因与来源[J].天然气勘探与开发,2025,48(4):1-14,14.基金项目
中国石化科技攻关项目"中西部三大叠合盆地及周缘资源评价"(编号:P23244)和"准噶尔盆地侏罗系自源系统成烃成藏及勘探方向"(编号:P24017) （编号:P23244）
中国石化科技基础前瞻项目"准噶尔盆地超深层油气源识别及多相态烃类赋存机理"(编号:P24184) （编号:P24184）
胜利油田科技攻关项目"阜康—东道海子凹陷侏罗系源储演化与油气运聚方向"(编号:YKK2403). （编号:YKK2403）
