准噶尔盆地吉木萨尔凹陷二叠系芦草沟组微—纳米孔隙页岩油原位赋存特征

刘金; 王剑; 张宝真; 曹剑; 尚玲; 张晓刚; 王桂君

doi:10.11781/sysydz202202270

准噶尔盆地吉木萨尔凹陷二叠系芦草沟组微—纳米孔隙页岩油原位赋存特征

doi: 10.11781/sysydz202202270

刘金^{1, 2,},
王剑^{1, 2},
张宝真³,
曹剑⁴,
尚玲²,
张晓刚²,
王桂君²

1.
新疆页岩油勘探开发实验室, 新疆克拉玛依 834000
2.
中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000
3.
中国石油新疆油田分公司风城油田作业区, 新疆克拉玛依 834000
4.
南京大学地球科学与工程学院, 南京 210023

基金项目:

中国石油科技重大专项“页岩油甜点形成机理与分类评价” 2019E-2602

详细信息

作者简介:
刘金(1989—)，男，硕士，工程师，从事非常规油气地质及微束、微区分析研究。E-mail: 602393581@qq.com

中图分类号: TE132.8
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-04
- 修回日期: 2022-01-06
- 刊出日期: 2022-03-28

In situ occurrence of shale oil in micro-nano pores in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

1.
Laboratory of Xinjiang Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China
2.
Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
3.
Fengcheng Oilfield Area, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
4.
School of Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China

摘要

摘要: 页岩油储层因微—纳米孔喉体系发育，使得油的赋存分散复杂，状态多样，研究困难。通过场发射扫描电镜、核磁共振、激光共聚焦和纳米CT等技术手段，对准噶尔盆地吉木萨尔凹陷中二叠统芦草沟组页岩油进行了研究。芦草沟组页岩油“甜点”粉—细砂岩和云质粉砂岩孔隙面孔率分布在11.0%~23.5%之间，大于2 μm的粒间溶孔、粒内溶孔占比在49.0%以上。受烃源岩生烃超压运移、孔隙表面吸附和页岩油连续成藏不同阶段油质差异等复杂因素控制，油和孔隙水的分布在微—纳米尺度上具有较强的分异性：“甜点”储层中2~5 μm以上孔隙内中质组分油和游离水赋存于孔隙中心，重质组分油以薄膜状赋存于孔隙表面；2 μm以下孔隙中主要为充填状重质组分油。中质组分油动用性较好，而重质组分油则是未来提高采收率比较现实可行的目标。
- 页岩油 /
- 孔隙分布 /
- 微观流体赋存 /
- 芦草沟组 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: The development of micro-nano pores and throats in shale oil reservoirs has made it complicated and diversified for the occurrence and state of oil, and is difficult to be studied. A case study was carried out with the Middle Permian Lucaogou Formation in the Jimsar Sag of Junggar Basin by the approaches of Field Emission Scanning Electron Microscopy (FESEM), Nuclear Magnetic Resonance (NMR), Laser Scanning Confocal Microscope (LSCM) and nano-CT. The plane porosities of siltstones and dolomitic siltstones in sweet spots of the study area range from 11.0% to 23.5%, and the dissolved pores and intragranular dissolved pores larger than 2 μm account for more than 49.0%. The distribution of oil and pore water has strong differentiation in micro-nano scale, which is controlled by complex factors such as overpressure migration of hydrocarbon generation, pore surface adsorption and oil quality difference in different stages of continuous shale oil accumulation. In sweet spot reservoirs, intermediate oil and free water occur in the center of pores larger than 2 μm, while heavy oil exists on pore surface as thin film. Pores with the size smaller than 2 μm are mainly filled with heavy oil. Intermediate oil is relatively easier to be explored, while heavy oil is a more realistic and feasible target for enhanced oil recovery in the future.
- shale oil /
- pore distribution /
- microscopic fluid occurrence /
- Lucaogou Formation /
- Jimsar Sag /
- Junggar Basin

HTML全文

图 1 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组厚度等值线(a)与芦草沟组综合柱状图(b)

Figure 1. Thickness contour (a) and comprehensive histogram (b) of Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 2 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩储层微—纳米孔隙特征

a.粒间溶孔与粒内溶孔，孔隙中有板条状自生钠长石充填，铸体薄片(蓝色铸体)，粉细砂岩，J10025井，3 542.31 m；b.粒间溶孔，砂屑云岩，铸体薄片(蓝色铸体)，J10025井，3 533.27 m；c.粒间溶孔，云质粉砂岩，铸体薄片(蓝色铸体)，吉30井，4 052.31 m；d.长石溶蚀孔隙，孔隙中板条状钠长石充填形成钠长石晶间孔，钠长石晶体表面分布有薄膜状油，液氮冷冻氩离子抛光后场发射扫描电镜观察(BSE)，J10025井，3 549.29 m；e.白云石晶间孔，孔隙边缘具溶蚀特征，场发射扫描电镜观察，吉41井，3 917.10 m；f.黏土矿物晶间孔，黏土矿物表面吸附有油，氩离子抛光后场发射扫描电镜观察(BSE)，J10022井，3 477.22 m

Figure 2. Micro-nano pore characteristics in shale oil reservoirs in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 3 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层孔隙图像分析

a.背散射扫描电镜图像，粉细砂岩，富含油级，J10025井，3 549.29 m；b.为a图孔隙图像分析结果，面孔率为19.6%；c.背散射电镜照片，砂屑云岩，J10016井，3 313.74 m；d.为c图孔隙图像分析结果，面孔率为11.0%

Figure 3. Pore images of shale oil reservoirs in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 4 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油微观赋存特征

a.纳米级—微米级全孔径含油，“小孔”中为充填状，“大孔”中为薄膜状，液氮冷冻氩离子抛光后场发射扫描电镜观察，J10025井，3 549.29 m；b.纳米孔中充填状油，液氮冷冻氩离子抛光后场发射扫描电镜观察，J10022井，3 477.22 m；c.孔隙边缘为重质组分油(蓝色)，孔隙中间为中质组分油(紫红色)，灰色为骨架矿物与颗粒，激光共聚焦分析，J10025井，3 555.06 m；d.微米级孔隙边缘为油(红色)，孔隙中间为水(蓝色)，白色为骨架矿物与颗粒，油水比94:6，纳米CT流体分析二维切片，坐标轴x、y代表柱塞样品横截面，坐标轴z代表柱塞样品长轴方向，J10014井，3 390.0 m

Figure 4. Microscopic occurrence of shale oil in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 5 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组储层核磁共振T₂谱特征

Figure 5. T₂ spectrum by NMR of reservoirs in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 6 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层甜点赋存模式示意

Figure 6. Occurrence mode of sweet spots in shale oil reservoirs in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

表 1 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层孔隙分布

Table 1. Pore distribution of shale oil reservoirs in Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

岩性	样品数/个	面孔率/%	不同孔径的孔隙占比/%
岩性	样品数/个	面孔率/%	＞2 000 nm	200~2 000 nm	200~20 nm	＜20 nm
粉细砂岩	14	17.0~23.5	49.0	45.8	3.8	1.4
砂屑云岩	10	10.5~16.5	20.6	70.1	7.6	1.7
云质粉砂岩	5	11.0~17.5	49.6	31.0	13.9	5.5
泥质粉砂岩	3	2.6~4.6	1.4	21.2	57.4	20.0

下载: 导出CSV

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