川中侏罗系自流井组大安寨段二亚段页岩油赋存特征

张晨雨; 刘子驿; 王斌; 单帅强; 陆建林; 王保华; 左宗鑫

doi:10.11781/sysydz2024061215

川中侏罗系自流井组大安寨段二亚段页岩油赋存特征

doi: 10.11781/sysydz2024061215

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

基金项目:

中国石化科技部项目“四川盆地及周缘构造改造与油气关系研究” P22072

中国石化“十四五”资源评价方法与数据库建设 P23229

详细信息

作者简介:
张晨雨(1993—), 女, 博士, 主要从事含油气盆地分析工作。E-mail: zhangchenyu.syky@sinopec.com

中图分类号: TE122.1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-09-25
- 修回日期: 2024-09-19
- 刊出日期: 2024-11-28

Occurrence characteristics of shale oil in the second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
2.
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China

摘要

摘要: 我国湖相页岩油资源丰富，但开采过程具有一定难度。揭示页岩油不同赋存状态在页岩储层中的赋存情况有助于页岩油资源的勘探与开发。以川中地区侏罗系自流井组大安寨段二亚段(以下简称大二亚段)页岩为研究对象，通过多温阶热解实验的实施、扫描电镜孔隙发育特征的观察以及洗油前后孔径分布的分析，揭示了页岩油不同状态在各介质孔隙中的赋存方式。川中地区大二亚段页岩中热模拟恢复后的页岩油以游离态为主(0.42~10.88 mg/g)，吸附态次之(0.30~1.95 mg/g)。页岩发育的储集空间主要为有机质孔(孔径2~600 nm)、黄铁矿粒间孔(孔径10~700 nm)、介壳粒内孔(孔径20~1 000 nm)、石英/长石粒间孔(孔径4~500 nm)以及黏土矿物晶间孔(孔径4~500 nm)。洗油后氮气吸附—高压压汞结果显示，页岩中孔径在2~30 nm以及60~1 000 nm的孔隙明显增多，页岩油主要赋存于此孔径范围的孔隙之中。同时建立了页岩油赋存状态与岩石中各介质间的关系热图，阐明了大二亚段页岩油主要赋存于有机质和黄铁矿之中。最终采用页岩油各赋存状态含量与洗油前后获取的含油体积拟合的方法，指明了研究区不同状态页岩油聚集的孔径范围。大二亚段页岩油游离态主要聚集于孔径60~700 nm的有机质和黄铁矿孔隙之中，吸附态主要聚集于孔径2~6 nm的有机质孔隙之中。对页岩油赋存特征进行深入剖析，有助于川中地区大二亚段页岩油开采突破。
- 页岩油 /
- 赋存状态 /
- 赋存空间 /
- 赋存方式 /
- 大安寨段二亚段 /
- 侏罗系 /
- 四川盆地
Abstract: Although China has abundant lacustrine shale oil resources, their exploitation is challenging. Investigating the various occurrence states of shale oil in shale reservoirs provides value for the exploration and development of shale oil resources. With the shale in the second submember of Da'anzhai Member of Jurassic Ziliujing Formation of the central Sichuan Basin (the Da2 submember) as the research object, the study reveals the occurrence modes of shale oil under different states in various medium pores, through the implementation of the multi-temperature pyrolysis experiment, the observation of pore development characteristics under the scanning electron microscope and the analysis of the pore size distribution before and after oil washing. In the Da2 submember, the shale oil is mainly in the free state (0.42 to 10.88 mg/g), followed by the adsorption state (0.30 to 1.95 mg/g), as revealed by thermal simulation recovery. The reservoir space of shale includes organic pores (pore size: 2 to 600 nm), pyrite intergranular pores (pore size: 10 to 700 nm), shell pores (pore size: 20 to 1 000 nm), quartz/feldspar intergranular pores (pore size: 4 to 500 nm) and clay mineral intergranular pores (pore size: 4 to 500 nm). After oil washing, the results of nitrogen adsorption and high pressure mercury injection demonstrated a significant increase in pores with sizes of 2 to 30 nm and 60 to 1 000 nm, where most of shale oil is stored. Meanwhile, it was demonstrated that the shale oil in the Da2 submember mainly occurs in organic matter and pyrite by establishing a heat map of the relationship between the occurrence state of shale oil and the medium in the rock. Lastly, by fitting the content of shale oil in different occurrence states with the oil volume obtained before and after oil washing, the pore size range for shale oil accumulation in the study area was determined. The free state of shale oil in the Da2 submember primarily accumulates in pores of organic matter and pyrite with pore size of 60 to 700 nm, and the adsorbed state of shale oil mainly accumulates in the organic matter pores with pore size of 2 to 6 nm. In conclusion, this study presents a thorough examination of the occurrence characteristics of shale oil in Da2 submember, and it will support shale oil exploitation efforts in the area.
- shale oil /
- occurrence state /
- occurrence space /
- occurrence mode /
- second submember of Da'anzhai Member /
- Jurassic /
- Sichuan Basin
注释:

利益冲突声明/Conflict of Interests

作者张晨雨、刘子驿、王斌、单帅强、陆建林、王保华、左宗鑫是本刊主办单位员工；单帅强是本刊青年编委会成员，均未参与本文的同行评审或决策。

ZHANG Chenyu, LIU Ziyi, WANG Bin, SHAN Shuaiqiang, LU Jianlin, WANG Baohua, and ZUO Zongxin are the employees of the sponsor of this journal. SHAN Shuaiqiang is a Young Editorial Board Member of this journal. They did not take part in peer review or decision making of this article.

作者贡献/Authors'Contributions

张晨雨、刘子驿参与实验设计，并完成实验操作；张晨雨、刘子驿、王斌、单帅强、陆建林、王保华和左宗鑫均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 study was designed and the experimental operation was completed by ZHANG Chenyu and LIU Ziyi. The manuscript was drafted and revised by ZHANG Chenyu, LIU Ziyi, WANG Bin, SHAN Shuaiqiang, LU Jianlin, WANG Baohua, and ZUO Zongxin. All authors have read the last version of the paper and consented to its submission.

HTML全文

图 1 四川盆地构造分区(a)及侏罗系自流井组地层柱状图(b)

Figure 1. Tectonic subdivision of Sichuan Basin (a) and stratigraphic column of Jurassic Ziliujing Formation (b)

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图 2 川中侏罗系自流井组大安寨段二亚段页岩油不同赋存状态的含量

Figure 2. Content of shale oil in different occurrence states in second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

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图 3 川中侏罗系自流井组大安寨段岩石中滞留油产率预测

Figure 3. Prediction of residual oil yield in Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

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图 4 洗油前后氮气吸附—高压压汞孔径分布

Figure 4. Pore size distribution with nitrogen adsorption and high pressure mercury injection before and after washing

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图 5 川中侏罗系自流井组大安寨段二亚段页岩油赋存状态与岩石中各介质间的关系热图

Figure 5. Heat map of relationship between shale oil occurrence states and various media within rock in second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

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图 6 川中侏罗系自流井组大安寨段二亚段页岩油赋存状态与岩石孔隙度、比表面积关系

Figure 6. Relationship between shale oil occurrence states, porosity, and specific surface area (S_BET) in second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

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图 7 川中侏罗系自流井组大安寨段二亚段不同孔径下的页岩油赋存状态

Figure 7. Shale oil occurrence in different pore sizes in second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

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表 1 选取样品基本信息

Table 1. Basic information of selected samples

样品编号	深度/m	ω(TOC)/%	VR_o/%	主要矿物成分/%				S_1-1/(mg/g)	S_1-2/(mg/g)	S_2-1/(mg/g)	S_BET/(m²/g)	孔隙度/%
样品编号	深度/m	ω(TOC)/%	VR_o/%	长英质	碳酸盐	黏土矿物	黄铁矿	S_1-1/(mg/g)	S_1-2/(mg/g)	S_2-1/(mg/g)	S_BET/(m²/g)	孔隙度/%
PL10-1	1 983.1	1.60	1.00	49.9	15.1	29.8	5.2	0.01	0.93	0.98
PL10-2	1 993.4	1.07	1.00	22.3	63.3	13.0	1.4	0.00	1.03	0.41
PL10-3	1 997.4	2.25	1.03	49.5	22.6	24.1	3.8	0.06	1.62	1.95	4.21	2.69
PL10-4	2 006.0	2.60	0.96	54.5	4.4	35.9	5.1	0.09	1.76	1.26	11.56	3.95
PL10-5	2 011.8	1.82	1.00	60.3	5.3	32.1	2.3	0.04	1.64	1.87
PL10-6	2 014.3	2.40	1.03	58.1	8.1	26.8	7.0	0.04	0.86	0.78	21.80	3.61
PL10-7	2 015.2	1.14	1.03	60.8	11.2	28.0	0.0	0.02	0.75	0.73
PL10-8	2 019.1	1.41	1.04	40.1	39.9	16.6	3.5	0.01	0.67	0.88
PL10-9	2 020.1	0.45	1.11	45.2	31.0	23.7	0.0	0.02	0.61	0.34	1.80	1.24
PL10-10	2 022.5	0.68	1.06	58.1	7.3	32.6	1.4	0.00	0.25	0.36	3.65	2.76
PL10-11	2 022.7	0.73	1.12	45.7	33.5	18.9	2.0	0.02	0.79	0.61
PL10-12	2 025.8	0.84	1.16	54.8	34.5	9.4	1.4	0.00	0.21	0.30
PL10-13	2 026.2	0.91	1.19	54.5	15.3	28.5	1.2	0.00	0.28	0.31	2.76	1.95
PL10-14	2 028.5	0.66	1.11	59.2	11.2	29.6	0.0	0.00	0.29	0.49
PL10-15	2 029.8	0.60	1.17	55.1	16.2	26.4	2.3	0.00	0.14	0.31
注：表中S_BET代表比表面积。

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表 2 川中侏罗系自流井组大安寨段页岩热模拟生排油参数^{[33, 38]}

Table 2. Parameters of oil generation and expulsion during shale thermal simulation in Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

样品信息	热模拟实验结果
样品信息	温度/℃	VR_o/%	校正VR_o/%	总油产率/(mg/g)	排出油产率/(mg/g)	滞留油产率/(mg/g)	排油效率/%	预测滞留油产率/(mg/g)
M030-H31, ω(TOC)=1.83%, VR_o=0.97%, 据文献[33]	250	1.15		84.47	11.15	73.32	13.20
	300	1.49	1.12	157.80	25.59	132.21	16.22	180.12
	350	1.63	1.19	200.76	110.24	90.52	54.91	102.61
	365	1.74	1.24	178.00	125.20	52.80	70.34	57.17
	380	1.84	1.28	88.83	78.71	10.12	88.61	26.73
	400	1.86	1.29	78.37	69.94	8.43	89.24	21.83
	450	1.97	1.33	31.77	29.41	2.36	92.57	1.56
Xi20, ω(TOC)=2.25%, VR_o=1.0%, 据文献[38]	250			198.72	31.80	166.93	16.00
	300			290.50	53.07	237.43	18.27
	325			293.32	65.95	227.37	22.48
	350			292.69	81.53	211.16	27.86
	375	1.54	1.15	311.50	96.87	214.64	31.10	144.55
	400	1.79	1.26	166.16	110.03	56.12	66.22	39.16
	450	1.93	1.32	93.01	83.45	9.56	89.72	6.80
	500	2.28	1.46	51.48	48.25	3.23	93.73	0.26

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表 3 川中侏罗系自流井组大安寨段二亚段页岩孔隙发育特征

Table 3. Characteristics of shale pores in second submember of Da'anzhai Member of Jurassic Ziliujing Formation, central Sichuan Basin

类型	孔隙识别图片	孔径分布
有机质孔
黄铁矿粒间孔
介壳粒内孔
其他孔

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