玛湖凹陷艾湖油田油藏特征及油源对比
投稿时间:2023-12-20  修订日期:2024-01-06  点此下载全文
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朱涛)* 中国石油新疆油田分公司勘探开发研究院 834000
李娜 中国石油新疆油田分公司勘探开发研究院 
邹阳 中国石油新疆油田分公司勘探开发研究院 
刘国良 中国石油新疆油田分公司勘探开发研究院 
赵毅 中国石油新疆油田分公司勘探开发研究院 
周作铭 中国石油新疆油田分公司勘探开发研究院 
王然 中国石油新疆油田分公司勘探开发研究院 
刘新龙 中国石油新疆油田分公司勘探开发研究院 
绳智健) 中国地质科学院 
中文摘要:玛湖凹陷作为准噶尔盆地重要富油气凹陷之一,油气藏主要分布在二叠系、三叠系和侏罗系,油气性质复杂。本次研究在前人工作基础上,以玛湖凹陷风城组(P1f)、夏子街组(P2x)、下乌尔禾组(P2w)和克拉玛依组(T2k)的烃源岩样品以及艾湖油田百口泉组(T1b)的原油样品为主要研究对象。通过TOC分析、岩石热解、碳同位素、饱和烃色谱、饱和烃色谱-质谱和单井埋藏史-热史的分析,明确玛湖凹陷百口泉组的原油来源问题。研究表明,玛湖凹陷风城组烃源岩有机质丰度明显优于下乌尔禾组烃源岩,且有机质丰度高,有机质类型以Ⅱ型干酪根为主,具有较高的生油潜力。百口泉组原油已达到成熟阶段,主要来源于弱氧化-弱还原的沉积环境。通过油源对比发现,玛湖凹陷原油与风城组烃源岩的生物标志物具有良好的可比性,反映了该地区原油主要来源于风城组烃源岩的贡献。且百口泉组油藏主要存在两期原油充注,分别为侏罗纪早期和白垩纪早期的原油充注,同风城组烃源岩生、排烃具有很好的耦合性。进一步佐证百口泉组原油来自风城组烃源岩这一观点。
中文关键词:玛湖凹陷  艾湖油田  烃源岩  生物标志化合物,地球化学  油源对比
 
Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Aihu oilfield, Junggar Basin
Abstract:As one of the important oil and gas-rich sags in Junggar Basin, Mahu sag is mainly distributed in Permian, Triassic and Jurassic, and the oil and gas properties are complex. On the basis of previous work, this study takes the source rock samples of Fengcheng Formation (P1f), Xiazijie Formation (P2x), Lower Urho Formation (P2w) and Karamay Formation (T2k) in Mahu Sag and the crude oil samples of Baikouquan Formation (T1b) in Aihu Oilfield as the main research objects. Through TOC analysis, rock pyrolysis, carbon isotope, saturated hydrocarbon chromatography, saturated hydrocarbon chromatography-mass spectrometry and single well burial history-thermal history analysis, the source of crude oil in Baikouquan of Mahu Sag was clarified. The results show that the organic matter abundance of Fengcheng Formation in Mahu Sag is obviously better than that of the source rock of Lower Wuerhe Formation, and the organic matter abundance is high. The organic matter type is mainly type II kerogen, which has high oil generation potential. The crude oil of the Baikouquan Formation has reached the mature stage, which is mainly derived from the weak oxidation-weak reduction sedimentary environment. Through oil-source correlation, it is found that the biomarkers of crude oil in Mahu Sag and Fengcheng Formation source rocks are well comparable, reflecting that the crude oil in this area mainly comes from the contribution of Fengcheng Formation source rocks. There are two stages of crude oil filling in the Baikouquan Formation reservoir, which are the early Jurassic and early Cretaceous crude oil filling, and the hydrocarbon generation and expulsion of the source rocks of the Fengcheng Formation.
keywords:Mahu Sag  Aihu oilfield  source rock  biomarker  Geochemistry  oil‐source correlation.
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