准噶尔盆地吉木萨尔凹陷北部芦草沟组高产页岩油特征及地质意义——以奇探1井为例  

Characteristics and geological significance of high-yield shale oil from the Lucaogou Formation in the northern Jimsar Sag of Junggar Basin:A case study of Well Qitan 1

作　　者：陈旋 苟红光 张有锦 高岗[2,3] 徐雄飞 林霖 韩猛刚 党文龙 樊柯廷 CHEN Xuan;GOU Hongguang;ZHANG Youjin;GAO Gang;XU Xiongfei;LIN Lin;HAN Menggang;DANG Wenlong;FAN Keting(Research Institute of Exploration and Development,CNPC Tuha Oilfield Company,Hami 839009,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Petroleum Resource and Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009 [2]中国石油大学(北京)地球科学学院,北京102249 [3]油气资源与工程全国重点实验室,中国石油大学(北京),北京102249

出　　处：《天然气地球科学》2025年第1期1-12,共12页Natural Gas Geoscience

基　　金：新疆维吾尔自治区“天山英才”科技创新领军人才支持项目(编号:2022TSYCLJ0070);中国石油天然气股份有限公司科技项目(编号:2023YQX10109)联合资助.

摘　　要：针对准噶尔盆地吉木萨尔凹陷北部奇探1井芦草沟组高产页岩油流的突破,通过原油、砂岩抽提物与烃源岩样品采集及相关分析测试,明确了奇探1井芦草沟组的烃源条件,分析了原油的物性、族组成与生物标志物分子特征,进而进行了油源及其条件分析。研究认为:吉木萨尔凹陷芦草沟组烃源岩为好的成熟油源岩,油源条件好,其中下段优于上段。芦草沟组原油密度和黏度具有随深度的增加先增后降的规律,最高值对应生油高峰,奇探1井芦草沟组下段页岩油属于中质稠油。芦草沟组烃源岩形成的水体由早期到晚期还原条件逐渐减弱。原油与临近深度烃源岩的成熟度参数偏高是排烃、运移和成熟作用共同作用的结果,奇探1井试油段页岩油具有一定程度的运移和聚集过程,以具备纵向上源储互层、横向上源储紧邻型源储配置关系和深部发育烃源岩的地区为凹陷勘探重点区域。该认识对于准噶尔盆地玛湖凹陷风城组及其他地区咸水湖相页岩油的勘探和开发均具有重要的指导作用。In view of the breakthrough of high-yield shale oil flow in the Lucaogou Formation of Well Qitan 1 in the northern Jimsar Sag,based on crude oil,sandstone extract and source rock sample collection and correlation analysis tests,this paper analyzes oil source and clarifies the hydrocarbon source conditions for shale oil enrich⁃ment in the Lucaogou Formation of Well Qitan 1.The physical properties,fraction composition and biomarkers molecular characteristics of crude oil are analyzed.It is concluded that the source rock of Lucaogou Formation is a good mature oil source rock with good oil-generating potential,among which the lower section source rock is better than the upper section.The density and viscosity of crude oil in the Lucaogou Formation of Jimsar Sag have the law of increasing first and then decreasing with the increase of depth,and the highest value corresponds to the peak of oil production.The shale oil in the lower section of the Lucaogou Formation in Well Qitan 1 is a medium viscous oil.Reducing conditions of the water body which the Lucaogou Formation source rocks was formed gradually weakened from early to late.The higher maturity parameters of crude oil than adjacent deep source rocks are the result of the combined action of hydrocarbon expulsion from source rock,transport and mat⁃uration,and the shale oil in the lower section of the Lucaogou Formation in Well Qitan 1 has a certain degree of migration and aggregation process.The key exploration areas for the depression are the vertically interbedded source reservoir,the horizontally adjacent source reservoir configuration relationship,and the areas with deep developed source rocks.This understanding has important guiding role for the exploration and development of saltwater lacustrine shale oil of Fengcheng Formation in the Mahu Sag,Junggar Basin and other areas.

关 键 词：吉木萨尔凹陷 芦草沟组 页岩油 原油物性 烃源条件 

分 类 号：TE122.113[石油与天然气工程—油气勘探]