川中侏罗系大安寨二亚段页岩油富集有利岩性组合

刘子驿; 陈冬霞; 雷文智; 朱传真; 卢龙飞; 朱建辉; 张晨雨

doi:10.11781/sysydz2024061240

川中侏罗系大安寨二亚段页岩油富集有利岩性组合

doi: 10.11781/sysydz2024061240

刘子驿^{1, 2, 3,},
陈冬霞^3, ,,
雷文智³,
朱传真⁴,
卢龙飞^{1, 2},
朱建辉^{1, 2},
张晨雨^{1, 2}

1.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
2.
中国石化油气成藏重点实验室, 江苏无锡 214126
3.
中国石油大学(北京) 油气资源与工程全国重点实验室, 北京 102249
4.
海洋地质与成矿作用重点实验室自然资源部第一海洋研究所, 山东青岛 266061

基金项目:

中国石化重大项目“十四五”资源评价方法与数据库建设 P23229

详细信息

作者简介:
刘子驿(1992—), 男, 博士, 工程师, 从事页岩油气地质研究。E-mail: liuzy9223.syky@sinopec.com

通讯作者:
陈冬霞(1974—), 女, 博士, 教授, 从事油气成藏研究。E-mail: Lindachen@cup.edu.cn

中图分类号: TE122.1
计量
- 文章访问数: 54
- HTML全文浏览量: 17
- PDF下载量: 16
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-06
- 修回日期: 2024-09-29
- 刊出日期: 2024-11-28

Favorable lithologic combinations for shale oil enrichment in the second submember of Da'anzhai Member, Jurassic, central Sichuan Basin

LIU Ziyi^{1, 2, 3
,},
CHEN Dongxia^{3
, ,},
LEI Wenzhi³,
ZHU Chuanzhen⁴,
LU Longfei^{1, 2},
ZHU Jianhui^{1, 2},
ZHANG Chenyu^{1, 2}

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China
3.
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
4.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanographyof Ministry of Natural Resources, Qingdao, Shandong 266061, China

摘要

摘要: 我国湖相页岩层系地层中岩性组合复杂，且不同岩性组合中的页岩油含量差异较大，明确有利的岩性组合将有助于探寻页岩油富集区。以川中侏罗系大安寨二亚段页岩层系为研究对象，通过矿物组分分析和岩心观察指明了页岩层系中主要发育介壳灰岩、夹介壳层页岩、含介壳页岩和纯页岩，各岩性中发育的孔缝类型多样，其中含介壳页岩和纯页岩中顺层微裂缝更加发育。为了进一步揭示页岩层系中发育的孔缝系统，开展了一维核磁实验来确定岩石中亲油孔缝和亲水孔缝相互间的比例关系(孔缝配置)。其中介壳灰岩和夹介壳层页岩的孔缝配置值＞60%，指示油气在其中的运移将受到限制；受顺层微裂缝发育的影响，含介壳页岩和纯页岩的孔缝配置值< 60%，说明其中的孔缝系统能成为较好的油气运移通道。受烃源供给能力和油气运移阻力的影响，在ω(TOC)＞1.0%的岩石中，相较于孔缝配置值< 60%，孔缝配置值＞60%的岩石具有更多残留油量且可动性较好(S₁在0.86~2.19 mg/g范围，均值为1.42 mg/g；OSI值在65.96~123.21 mg/g，均值为91.98 mg/g)。最终结合研究区有机质富集特征，阐明了研究区大安寨二亚段页岩油富集有利岩性组合。
- TOC含量 /
- 孔缝配置 /
- 页岩油富集 /
- 有利岩性组合 /
- 大安寨二亚段 /
- 川中地区
Abstract: The lithologic combinations in lacustrine shale strata in China are complex, and shale oil content varies significantly across different combinations. Identifying favorable lithologic combinations will assist in locating shale oil-rich zones. This study takes the shale strata of the second submember of the Da'anzhai Member (Da 2 submember) in Jurassic of the central Sichuan Basin as a case study. Using mineral composition analysis and core observation, four primary lithologies were identified: shell limestone, shale with interbedded shell layers, shell-bearing shale, and pure shale. Various types of pores and fractures develop in each lithology, with bedding-parallel microfractures being more developed in shell-bearing shale and pure shale. To further reveal the pore and fracture system in the shale strata, the proportion of oil-wet and water-wet pores and fractures in the rock (pore and fracture configuration) were determined through one-dimensional nuclear magnetic resonance (NMR) experiments. The pore and fracture configuration values of shell limestone and shale with interbedded shell layers exceeded 60%, indicating restricted oil and gas migration. Due to the development of bedding-parallel microfractures, the pore and fracture configuration values in shell-bearing shale and pure shale were less than 60%, indicating that these lithologies provided more favorable migration channels for oil and gas. Furthermore, influenced by the hydrocarbon supply capacity and the resistance in oil and gas migration, rocks with total organic carbon (TOC) content greater than 1.0% as well as pore and fracture configuration values greater than 60% possessed more residual oil and exhibited better mobility than those with pore and fracture configuration values smaller than 60% (S₁ranging from 0.86 to 2.19 mg/g, with an average of 1.42 mg/g; OSI values ranging from 65.96 to 123.21 mg/g, with an average of 91.98 mg/g). Finally, based on the characteristics of organic matter enrichment, the favorable lithologic combinations for shale oil enrichment in the Da 2 submember in the study area were clarified.
- TOC content /
- pore and fracture configuration /
- shale oil enrichment /
- favorable lithologic combinations /
- second submember of Da'anzhai Member /
- central Sichuan Basin
注释:

利益冲突声明/Conflict of Interests

作者刘子驿、卢龙飞、朱建辉、张晨雨是本刊主办单位员工，均未参与本文的同行评审或决策。

Authors LIU Ziyi, LU Longfei, ZHU Jianhui, and ZHANG Chenyu are employees of the sponsor of this journal, and they did not take part in peer review or decision making of this article.

作者贡献/Authors'Contributions

刘子驿、陈冬霞参与实验设计；刘子驿、雷文智完成实验操作；刘子驿、朱传真、卢龙飞、朱建辉和张晨雨参与论文写作和修改。所有作者均阅读并同意最终稿件的提交。

The experiments were designed by LIU Ziyi and CHEN Dongxia. The experimental operation was completed by LIU Ziyi and LEI Wenzhi. The manuscript was drafted and revised by LIU Ziyi, ZHU Chuanzhen, LU Longfei, ZHU Jianhui, and ZHANG Chenyu. All authors have read the last version of the paper and consented to its submission.

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图 1 四川盆地区域地质背景图

a.四川盆地区域构造格局；b.川中地区侏罗系发育的地层；c.川中地区大安寨段连井剖面。

Figure 1. Regional geological background of Sichuan Basin

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图 2 川中地区大二亚段页岩层系岩性特征

a.结晶介壳灰岩，X29井，2 047 m；b.泥质介壳灰岩，PL10井，1 968 m；c.夹介壳层页岩，PL10井，1 994 m；d.夹介壳层页岩与含介壳页岩，PL10井，2 015 m；e.含介壳页岩，G10井，2 706.5 m；f.纯页岩，G10井，2 078 m。

Figure 2. Lithologic characteristics of shale strata in Da 2 submember, central Sichuan Basin

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图 3 川中地区大二亚段储层中的孔缝类型

a.介壳灰岩中粒内孔，PL10井，2 021.1 m；b.介壳灰岩结构缝中充填少量有机质，PL10井，2 021.1 m；c.页岩夹介壳层中粒内孔，G10井，2 720.9 m；d.页岩夹介壳层中结构缝，PL10井，1 997.4 m；e.页岩夹介壳层中有机孔缝，PL10井，1 997.4 m；f.页岩夹介壳层中有机孔和黏土矿物晶间孔，G10井，2 712.5 m；g.页岩含介壳中粒内孔和结构缝，PL10井，2 026.7 m；h.页岩含介壳中顺层微裂缝，PL10井，2 026.7 m；i.页岩含介壳中有机质收缩缝和黏土矿物晶间缝，PL10井，2 014.3 m；j.纯页岩中有机孔和黏土矿物晶间孔，PL10井，2 006.0 m；k.纯页岩中有机质收缩缝，PL10井，2 006.0 m；l. 纯页岩中顺层微裂缝，PL10井，2 006.0 m。

Figure 3. Types of pores and fractures in reservoirs of Da 2 submember, central Sichuan Basin

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图 4 川中地区大二亚段不同岩性的孔隙度和渗透率关系

Figure 4. Relationship between porosity and permeability of different lithologies in Da 2 submember, central Sichuan Basin

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图 5 核磁共振T₂谱储层指示意义^[39]

据参考文献[42]修改。

Figure 5. Significance of nuclear magnetic resonance (NMR) T₂ spectra in reservoir analysis

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图 6 川中地区大二亚段不同岩性样品饱和油和饱和水核磁共振T₂谱图

Figure 6. Nuclear magnetic resonance (NMR) T₂ spectra of oil-saturated and water-saturated samples of different lithologies in Da 2 submember, central Sichuan Basin

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图 7 川中地区大二亚段样品孔缝配置模式

Figure 7. Pore and fracture configuration modes of samples from Da 2 submember, central Sichuan Basin

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图 8 川中地区大二亚段不同岩性含油特征

a.岩石中S₁与ω(TOC)之间的关系；b.不同岩性中S₁的差异；c.岩石中OSI与ω(TOC)之间的关系；d.不同岩性中OSI的差异。

Figure 8. Oil-bearing characteristics of different lithologies in Da 2 submember, central Sichuan Basin

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图 9 川中地区侏罗系大二亚段页岩油富集的有利岩性组合

Figure 9. Favorable lithologic combinations for shale oil enrichment in Da 2 submember, Jurassic, central Sichuan Basin

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表 1 川中地区大二亚段孔缝配置分析的样品基本信息

Table 1. Basic information of samples for pore and fracture configuration analysis in Da 2 submember, central Sichuan Basin

样品编号	井位	深度/m	岩性	主要矿物成分/%			ω(TOC)/ %	孔隙度/ %	渗透率/ 10^-3 μm²
样品编号	井位	深度/m	岩性	石英+长石	碳酸盐矿物	黏土矿物	ω(TOC)/ %	孔隙度/ %	渗透率/ 10^-3 μm²
G10-8	G10井	2 704.7	介壳灰岩	8.4	81.3	9.1	0.64	2.77	0.071 4
PL10-15	PL10井	2 020.1	夹介壳层页岩	45.2	31.0	23.7	0.45	1.24	0.002 8
PL10-35	PL10井	1 997.4	夹介壳层页岩	49.5	22.6	24.1	2.25	2.69	0.087 1
PL10-10	PL10井	2 026.7	含介壳页岩	55.5	15.8	27.5	0.86	3.98	0.242 8
PL10-22	PL10井	2 014.3	含介壳页岩	58.1	8.1	26.8	2.40	3.61	0.089 2
PL10-28	PL10井	2 006.0	纯页岩	54.5	4.4	35.9	2.60	3.95	0.126 8

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表 2 川中地区大二亚段发育的岩性特征

Table 2. Lithologic characteristics developed in Da 2 submember, central Sichuan asin

岩性名称	岩性照片	薄片照片	介壳特征	矿物含量分布	TOC含量/%
介壳灰岩			介壳大量发育，破碎较为严重且介壳排列杂乱		0.03~2.03(N=22)平均: 0.46
夹介壳层页岩			介壳成层出现		0.18~3.11(N=49)平均: 0.99
含介壳页岩			介壳量少，见漂浮介壳		0.22~2.90(N=33)平均: 1.12
纯页岩			无介壳		0.14~2.33(N=23)平均: 1.22

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表 3 川中地区大二亚段样品孔缝配置参数

Table 3. Pore and fracture configuration parameters of samples from Da 2 submember, central Sichuan Basin

样品编号	Φ_of/%	Φ_op/%	Φ_wf/%	Φ_wp/%	Φ_of/Φ_op	Φ_wf/Φ_wp	λ/%	配置关系
G10-8	0.08	0.27	0.15	1.86	0.301	0.078	79.45	差
PL10-15	0.06	0.52	0.05	0.92	0.120	0.052	69.61	差
PL10-35	0.04	1.45	0.01	2.05	0.027	0.007	79.75	差
PL10-10	0.07	0.74	0.51	2.80	0.089	0.182	32.76	好
PL10-22	0.11	1.18	0.18	2.88	0.090	0.062	59.15	中等
PL10-28	0.42	2.03	0.41	2.77	0.205	0.150	57.88	中等

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