天然气地球科学 ›› 2023, Vol. 34 ›› Issue (2): 210–225.doi: 10.11764/j.issn.1672-1926.2022.10.010

• 天然气地球化学 • 上一篇    下一篇

鄂尔多斯盆地宁县地区长73亚段泥页岩地球化学特征及页岩油意义

崔德艺1,2(),辛红刚3,4,张亚东5,淡卫东3,4,陈俊霖1,2,张珊1,2,李家程1,2,李树同1()   

  1. 1.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
    4.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
    5.中国石油长庆油田分公司勘探事业部,陕西 西安 710018
  • 收稿日期:2022-09-02 修回日期:2022-10-20 出版日期:2023-02-10 发布日期:2023-03-06
  • 通讯作者: 李树同 E-mail:18810993021@163.com;lishutong1979@163.com
  • 作者简介:崔德艺(1996-),男,甘肃庆城人,硕士研究生,主要从事石油地质学研究.E-mail:18810993021@163.com.
  • 基金资助:
    国家自然科学基金面上项目(41772142);甘肃省科技计划(22JRSRA045)

Geochemical characteristics and shale oil significance of Chang 73 sub-member mud shale in Ningxian area, Ordos Basin

Deyi CUI1,2(),Honggang XIN3,4,Yadong ZHANG5,Weidong DAN3,4,Junlin CHEN1,2,Shan ZHANG1,2,Jiacheng LI1,2,Shutong LI1()   

  1. 1.Northwest Institute of Eco?Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields,Xi’an 710018,China
    4.Exploration & Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an 710018,China
    5.Exploration Division of PetroChina Changqing Oilfield Company,Xi’an 710018,China
  • Received:2022-09-02 Revised:2022-10-20 Online:2023-02-10 Published:2023-03-06
  • Contact: Shutong LI E-mail:18810993021@163.com;lishutong1979@163.com
  • Supported by:
    The National Natural Science Foundation of China(41772142);the Science and Technology Plan of Gansu Province, China(22JRSRA045)

摘要:

鄂尔多斯盆地长7段页岩型页岩油可动性差,开采难度大,相关研究薄弱。基于宁县地区N228井延长组长73亚段全取心井资料,通过对荧光薄片扫描图件观察,结合单步岩石热解、可溶有机质分析、TOC含量和生物标志物等参数,综合分析研究区长73亚段页岩油的成熟度、沉积环境、母质类型及含油性特征,探讨它们对非常规油气勘探的指导意义。结果表明:泥页岩有机质类型为II1型,为倾油性母质,饱和烃具有明显的轻碳优势,生烃母质以低等水生生物为主,混有少量高等植物;有机质整体处于低—中等成熟演化阶段;Pr/Ph<1,γ?Ga/C30H平均值为0.04,C30*D H/C30H平均值为0.11,指示长73亚段泥页岩形成于贫氧还原淡水深湖沉积环境;在泥页岩层系中,含油饱和度指数OSI值较低(<70 mg/g),游离油含量占比低,说明游离烃类还未达到自身的容留状态,没有形成超越效应,可动性差。这些结果为加深认识鄂尔多斯盆地宁县地区长73亚段页岩型页岩油地球化学特征和含油性评价提供新的参考。

关键词: 鄂尔多斯盆地, 页岩油, 地球化学特征, 含油性, 游离油

Abstract:

The shale oil of shale type for the seventh member of Yanchang Formation is poor in mobility, difficult to exploit, and weak in relevant research. Based on the full coring well data of Chang 73 sub-member of Well N228 in the Ningxian area of Ordos Basin, through the observation of the fluorescent thin slice scanning map, combined with the indicators of single step rock pyrolysis, analysis of soluble organic matter, TOC content, biomarkers and other parameters, the maturity, sedimentary environment, parent material type and oil-bearing characteristics of shale oil in Chang 73 sub-member of the study area are comprehensively analyzed, and their guiding significance for unconventional oil and gas exploration is discussed. The results show that the shale organic matter type is II1, which is an oil dipping parent material. Saturated hydrocarbons have obvious light carbon advantages. The hydrocarbon generating parent material is mainly composed of lower aquatic organisms mixed with a small amount of higher plants. The organic matter is in the low to medium mature evolutionary stage as a whole, Pr/Ph<1, the average value of γ-Ga/C30H is 0.04, and the average value of C30*D H/C30H is 0.11, indicating that the mud shale of Chang 73 sub-member was formed in the oxygen poor reducing freshwater deep lake sedimentary environment.In mud shale series, the OSI value of oil saturation index is low(<70 mg/g), and the proportion of free oil content is low, indicating that free hydrocarbons have not reached their own retention status, and there is no transcendental effect and poor mobility. These results provide a new reference for further understanding the geochemical characteristics and oil-bearing evaluation of shale oil in Chang 73 sub-member of Ningxian area, Ordos Basin.

Key words: Ordos Basin, Shale oil, Geochemical characteristics, Oil-bearing, Free oil

中图分类号: 

  • TE122.1+13

图1

鄂尔多斯盆地构造图(a)及N228井岩性地层综合柱状图(b)(图1(a)据文献[26],修改)"

图2

研究区长73亚段泥页岩岩心照片及有机质微观赋存特征(a)页岩,埋深1 753.70 m,可见植物碎片;(b)页岩,埋深1 756.10 m,有明显的页理; (c)泥岩,埋深1 766.80 m,矿物组分均一; (d)—(e)页岩,前者为普通薄片(正交光),后者为荧光薄片,埋深1 763.05 m,顺层油气显示,纹层状黄色荧光; (f)—(g)页岩,前者为普通薄片(正交光),后者为荧光薄片,埋深1 750.6 m,有机质呈条带状分布;(h)—(i)页岩,前者为普通薄片(正交光),后者为荧光薄片,埋深1 757.40 m,裂缝油气显示"

表1

研究区长73亚段泥页岩正构烷烃及类异戊二烯烷烃参数"

序号层位岩性峰型碳数范围主峰碳Pr/nC17Ph/nC18Pr/PhΣnC21-/ΣnC22+TARnC17/nC27CPI
1长73泥岩单峰nC12~nC33nC160.180.250.802.050.252.981.04
2长73页岩单峰nC11~nC35nC170.180.270.751.700.322.431.02
3长73页岩单峰nC11~nC33nC170.150.270.641.650.342.231.02
4长73页岩单峰nC11~nC33nC160.080.200.462.880.164.231.04
5长73泥岩单峰nC11~nC35nC160.110.220.581.990.262.891.03
6长73页岩单峰nC12~nC33nC170.140.220.722.360.203.571.03
7长73页岩单峰nC11~nC35nC150.110.230.521.760.302.471.03
8长73页岩单峰nC12~nC33nC170.090.200.503.240.135.111.05
9长73泥岩单峰nC11~nC36nC160.120.280.481.600.332.291.03

表2

研究区长73亚段泥页岩甾萜类生物标志物参数"

序号层位岩性C27/%C28/%C29/%γ-Ga/C30-HABCDEFG
1长73泥岩2324510.040.440.530.570.640.240.110.10
2长73页岩2322540.040.440.530.580.590.210.110.10
3长73页岩2026530.040.440.540.540.610.220.110.10
4长73页岩2425490.040.440.530.570.660.260.130.15
5长73泥岩2326500.040.450.560.560.610.220.110.11
6长73页岩2226520.040.430.550.580.600.230.100.12
7长73页岩2127520.040.460.550.560.570.230.100.10
8长73页岩3125430.040.450.560.570.660.270.110.16
9长73泥岩2124540.040.460.540.570.570.200.110.10

图3

研究区长73亚段泥页岩正构烷烃色谱特征"

图4

研究区长73亚段泥页岩甾、萜烷色谱特征"

图5

研究区长73亚段泥页岩C27、C28、C29规则甾烷三元图"

表3

研究区长73亚段泥页岩有机质丰度评价参数"

序号层位岩性S1/(mg/g)S2/(mg/g)TOC/%S1+S2)/ (mg/g)IH/ (mg/g)Tmax/℃RO/%
1长73泥岩4.1555.113.2959.25414.604390.63
2长73页岩3.4429.798.4333.23353.384430.76
3长73页岩3.3933.7210.2137.11330.264420.75
4长73页岩6.9073.0519.0579.95383.464410.71
5长73泥岩6.1549.7314.1055.88352.704430.77
6长73页岩5.9172.8015.6378.71465.774430.85
7长73页岩3.4127.596.9931.00394.714480.83
8长73页岩6.5482.3521.8288.89377.414440.68
9长73泥岩6.7544.0011.4650.75383.944460.66

图6

研究区长73亚段泥页岩岩石热解(S1+S2)—TOC关系图"

图7

研究区长73亚段泥页岩有机质类型判别"

图8

研究区长73亚段泥页岩C2920S/(20S+20R)和C29ββ/(αα+ββ)交会图"

图9

研究区长73亚段泥页岩热解参数对游离油、吸附油的影响"

表 4

研究区长73亚段泥页岩热解地球化学参数"

序号层位岩性单步热解参数计算结果
常规热解抽提后热解

S1/

(mg/g)

S2/

(mg/g)

TOC/

%

Tmax /

S1x/

(mg/g)

S2x/

(mg/g)

TOC/

%

Tmax/

OSI/

(mg/g)

S0t/

(mg/g)

St/

(mg/g)

Sδ/

(mg/g)

游离油占比/%
1长73泥岩4.1555.1013.294390.2047.0912.4744031.234.3512.167.8135.77
2长73页岩3.4429.798.434430.3525.327.0944340.813.797.914.1247.91
3长73页岩3.3933.7210.214420.3030.469.7144133.203.696.652.9655.49
4长73页岩6.9073.0519.054410.6960.0520.5643736.227.5919.9012.3138.14
5长73泥岩6.1549.7314.104430.2343.0214.4444143.626.3812.866.4849.61
6长73页岩5.9172.815.634430.4664.2215.9744237.816.3714.498.1243.96
7长73页岩3.4127.596.994480.2421.856.5044948.783.659.155.5039.89
8长73页岩6.5482.3521.824440.6077.1220.3544229.977.1411.774.6360.66
9长73泥岩6.7544.0011.464460.1031.899.0844658.906.8518.8612.0136.32

图10

研究区长73亚段泥页岩样品TOC与S1关系(①—⑤见表5)"

表5

研究区长73亚段泥页岩层系含油性评价[66]"

区域

S1/

(mg/g)

OSI/

(mg/g)

绝对含油量评价可动性评价含油性综合评价
3~6>70含量高可动性好有效资源
1~3>70含量较高可动性较好
3~6<70含量高可动性较差潜在资源
1~3<70含量较高可动性较差
<1<70含量低可动性差无效资源
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