准噶尔盆地吉木萨尔凹陷芦草沟组甜点页岩油微观赋存特征及成因机制
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本文为国家科技重大专项(编号:2017ZX05001002)和中国石油科技重大专项(编号:2019E-2602)的成果


Microscopic occurrence characteristics and genetic mechanism of shale oil in sweet spot reservoir of the Lucaogou Formation in Jimsar Sag
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    摘要:

    准噶尔盆地吉木萨尔页岩油是中国典型的陆相页岩油。通过场发射扫描电镜、激光共聚焦、纳米CT、核磁共振等实验技术联合对微纳米孔隙中页岩油赋存特征进行研究,结果表明甜点储层具有纳米—亚微米—微米全尺度含油特征。在微纳米尺度,油、水赋存特征表现为重质组分油附着于2~5 μm以上孔隙的孔壁及充填于2~5 μm以下的孔隙中,中质组分油赋存于2~5 μm以上孔隙的中央,孔隙水含量较少,呈孤立状赋存于2~5 μm以上孔隙的中央,并被中质组分油包裹。页岩油在微纳米孔隙中的赋存不仅受生烃超压充注控制,还受吸附作用及多期次成藏影响。孔隙表面润湿性由亲水润湿反转为亲油润湿是烃类发生吸附的主要原因,多期次成藏造成微纳米孔隙中油质差异及高的含油饱和度。早期生烃超压充注进储层的重质组分油在孔隙表面亲油润湿下吸附于孔隙表面,随着吸附层变厚,纳米级孔隙逐渐被充满,孔隙水被驱替到较大的孔隙中间;后期成熟的中质组分油以此方式进一步充注和调整。研究认为埋深较大的凹陷西部是有利勘探方向。微纳米孔隙中的重质组分油是未来页岩油提高采收率的方向。吉木萨尔页岩油微观赋存特征及成因机制可能具有普遍性,对于中国陆相页岩油的深入研究具有借鉴意义。

    Abstract:

    Jimsar shale oil in Junggar basin is a typical continental shale oil in China. The main purpose of this paper is to study the microscopic occurrence characteristics and genetic mechanism of shale oil in sweet spot reservoir of the Lucaogou Formation in Jimsar Sag. Methods:The occurrence characteristics of shale oil in micro-nano pores were studied by FESEM, LSCM, nano CT, NMR and other experimental techniques. Results: the sweet spot reservoir has a full scale oil bearing characteristics of nanometer-submicron-micron. At the micro-nano scale, oil and water occured in the form of heavy oil attached to the wall of the pore above 2~5 μm and filled in the pore below 2~5 μm. The intermediate oil occured in the center of the pore above 2~5 μm, and Pore water content is small, isolated in the center of the pore above 2~5 μm, and is encased by intermediate oil. Conclusions:The occurrence of shale oil in micro-nano pores is not only controlled by hydrocarbon generation overpressure charging, but also affected by adsorption and multi-stage accumulation. The main reason for hydrocarbon adsorption is the change of pore surface wettability from hydrophilic wettability to lipophilic wettability. The multi-stage accumulation results in the difference of oil quality and high oil saturation in nano-micro pores. The heavy component oil injected into the reservoir by hydrocarbon generation overpressure in the early stage and adsorbs on the pore surface under the oil-wetting condition. As the adsorption layer thickens, the nanoscale pores are gradually filled and the pore water is displaced to the middle of the larger pores. Later mature intermediate component oils are further charged and adjusted in this manner. The research shows that the western part of the depression with large buried depth is the favorable exploration direction. The heavy component oil in the micro-nano pore is the direction of shale oil EOR in the future.

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刘金,王剑,张晓刚,尚玲,王桂君,艾尼·阿不都热依木.2022.准噶尔盆地吉木萨尔凹陷芦草沟组甜点页岩油微观赋存特征及成因机制[J].地质论评,68(3):907-920,[DOI].
LIU Jin, WANG Jian, ZHANG Xiaogang, SHANG Ling, WANG Guijun, Aini·ABUDUREYIMU.2022. Microscopic occurrence characteristics and genetic mechanism of shale oil in sweet spot reservoir of the Lucaogou Formation in Jimsar Sag[J]. Geological Review,68(3):907-920.

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  • 收稿日期:2021-10-25
  • 最后修改日期:2021-12-30
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  • 在线发布日期: 2022-05-19
  • 出版日期: 2022-05-15