准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层孔隙结构、烃类赋存及其与可动性关系

王剑; 周路; 靳军; 刘金; 陈俊; 蒋欢; 张宝真

doi:10.11781/sysydz202106941

准噶尔盆地吉木萨尔凹陷芦草沟组页岩油储层孔隙结构、烃类赋存及其与可动性关系

doi: 10.11781/sysydz202106941

王剑^{1, 2, 3,},
周路^1, ,,
靳军^{2, 3},
刘金^{2, 3},
陈俊^{2, 3},
蒋欢^{2, 3},
张宝真⁴

1.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500
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.
新疆页岩油勘探开发实验室, 新疆克拉玛依 834000
4.
中国石油新疆油田分公司风城作业区, 新疆克拉玛依 834000

基金项目:

国家科技重大专项 2017ZX05008-004-008

新疆维吾尔自治区重点实验室开放课题 2017D04023

详细信息

作者简介:
王剑(1984-), 男, 硕士, 高级工程师, 从事沉积学与储层地质学研究。E-mail: wangjian_2605@126.com

通讯作者:
周路(1962-), 男, 博士, 教授, 从事地震岩性及储层预测方面的科研与教学工作。E-mail: zhoulu9@126.com

中图分类号: TE311
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出版历程
- 收稿日期: 2021-04-29
- 修回日期: 2021-09-30
- 刊出日期: 2021-11-28

Pore structure, hydrocarbon occurrence and their relationship with shale oil production in Lucaogou Formation of Jimsar Sag, Junggar Basin

WANG Jian^{1, 2, 3
,},
ZHOU Lu^{1
, ,},
JIN Jun^{2, 3},
LIU Jin^{2, 3},
CHEN Jun^{2, 3},
JIANG Huan^{2, 3},
ZHANG Baozhen⁴

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
3.
Xinjiang Key Laboratory of Shale Oil Exploration and Development, Karamay, Xinjiang 834000, China
4.
Fengcheng Oilfield Operation Area, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

摘要

摘要: 为研究页岩油可动性与储层孔隙和含油性的关系，采用场发射扫描电镜、激光共聚焦显微镜、纳米CT、高压压汞法与氮气吸附联合分析、核磁共振分析、分子模拟分析等实验技术，对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全尺度分布特征、烃类赋存特征进行了定量分析。该页岩油储层各类岩性孔隙分布存在较大差异性，优势岩性为砂屑云岩、长石岩屑粉细砂岩和云质粉砂岩，其中长石岩屑粉细砂岩最好，大于300 nm孔隙占比74.1%，主体以粒间（溶）孔、粒内溶孔为主。微纳米尺度流体赋存具有较大的分异性。重质组分在半径300 nm以上孔隙中呈薄膜状附着于矿物、孔隙表面，300 nm以下呈充填状；中质组分赋存于300 nm以上孔隙中央；水含量较少，赋存于300 nm以上孔隙中央，被中质组分包裹。芦草沟组页岩油孔喉动用下限为50 nm；300 nm以上孔喉中烃类易动用，是当前产能主要贡献体系，采出原油为300 nm以上“大孔”中的中质油；50~300 nm孔喉较难动用，是提高采收率的关键。负压和升温可有效提升纳米孔中烃类的可动性。
- 孔隙结构 /
- 赋存特征 /
- 可动性 /
- 页岩油 /
- 芦草沟组 /
- 二叠系 /
- 吉木萨尔凹陷 /
- 准噶尔盆地
Abstract: In order to study the relationship between shale oil production and reservoir porosity or the oil content, experimental approaches including FE-SEM, LSCM, nano CT, high pressure mercury injection and nitrogen adsorption combined analysis, NMR analysis and molecular simulation were used to quantitatively analyze the full-scale distribution and occurrence characteristics of shale oil in Permian Lucaogou Formation of the Jimsar Sag, Junggar Basin. There are significant differences in the pore-size distribution of various lithologies in shale oil reservoir of the Jimsar Sag. The dominant lithology are arenaceous dolomite, feldspar lithic siltstone and dolomitic siltstone, and the best one is feldspar lithic fine sand rock, with pores larger than 300 nm accounting for 74.1%, and the main body is intergranular (dissolved) pores and intergranular dissolved pores. Fluid occurs with large heterogeneous in micro-nano scale. Heavy components with fluorescence wavelength between 600 and 800 nm attached to mineral pore surface as thin film in pores with a radius above 300 nm, and filled in pores with a radius below 300 nm. The medium components with fluorescence wavelength between 490 and 600 nm occur in the center of pores above 300 nm. The water content is low, and occurs in the center of the pores above 300 nm wrapped by the medium component. The lower limit of pore throat production of shale oil in the Lucaogou Formation is 50 nm. Above 300 nm, the hydrocarbon in pore throat is easy to be produced and is the main contribution system of current productivity. The recovered crude oil with medium density is mainly from large pore above 300 nm. Pore-throats distributed between 50 to 300 nm are difficult for the shale oil producing, which is the key to enhance oil recovery. Negative pressure and temperature rise can effectively improve the mobility of hydrocarbons in nano-scale pores.
- pore structure /
- characteristics of hydrocarbon occurrence /
- shale oil production /
- shale oil /
- Lucaogou Formation /
- Permian /
- Jimsar Sag /
- Junggar Basin

HTML全文

图 1 准噶尔盆地吉木萨尔凹陷构造特征(a)及二叠系芦草沟组地层柱状图(b)

Figure 1. Structural characteristics of Jimsar Sag in Junggar Basin (a) and stratigraphic histogram of Permian Lucaogou Formation (b)

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储层孔隙特征

a.长石粒内溶孔，内部板状钠长石和似蜂巢状伊/蒙混层矿物充填，氩离子抛光后扫描电镜观测，J10012井，3 313.99 m；b.白云石晶间孔，氩离子抛光后扫描电镜观测，吉179井，3 334.89 m；c.狭缝形伊/蒙混层矿物晶间孔，氩离子抛光后扫描电镜观测，J10012井，3 313.97 m；d.纳米级—微米级全孔径含油特征，呈“大孔薄膜状，小孔充填状”赋存，氩离子抛光后扫描电镜观测，J10025井，3 549.29 m

Figure 2. Reservoir pore characteristics of 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岩石全孔径分布

Figure 3. Distribution of total pore size of rocks of Lucaogou Formation in Permian 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不同岩性储层孔隙分布

Figure 4. Pore distribution of different lithological reservoirs of 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页岩油赋存特征

激光共聚焦分析，蓝色为重质组分，紫红色为中质组分，红色为轻质组分

Figure 5. Occurrence characteristics of shale oil of 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储层饱和氯化锰前、后核磁共振T₂谱特征

Figure 6. Characteristics of NMR T₂ spectrum before and after of manganese chloride in Permian Lucaogou Formation reservoir saturation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 7 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层毛细管压力曲线

Figure 7. Capillary pressure curve of shale oil reservoir of Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 8 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩储层纳米CT孔隙结构特征

a-b.孔隙分布的球棍模型，红色节点为孔隙，连接线是喉道，吉305井，3 579.36 m，粉细砂岩；c.喉道模型图；d.渗流模拟图，渗流趋势线以平行岩石层理的方向为主，垂直层理分布的趋势线较少

Figure 8. Nano-CT pore structure characteristics of shale reservoir of Permian Lucaogou Formation in Jimsar Sag, Junggar Basin

下载: 全尺寸图片幻灯片

图 9 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩负压和升温下纳米孔中原油随时间变化

云质粉砂岩，吉31井，2 897.90 m

Figure 9. Variation of crude oil in nanopores with time under negative pressure and heating in dolomitic siltstone in Permian Lucaogou Formation, 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不同岩性及孔喉尺度下的渗透率贡献比例

Table 1. Permeability contribution ratio of different lithology and pore throat scale in Jimsar Sag, Junggar Basin

岩性	样品数/块	核磁孔隙度/%	可动流体饱和度/%	＞300 nm		50~300 nm		＜50 nm
岩性	样品数/块	核磁孔隙度/%	可动流体饱和度/%	占比/%	贡献/%	占比/%	贡献/%	占比/%	贡献/%
长石岩屑粉细砂岩	22			74.1	98	21.4	2	4.5	0
云质粉砂岩	18			59.8	82	23.0	18	17.2	0
砂屑云岩	12			40.5	70	52.1	30	7.4	0
注：表中分式为。

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