川东北地区下侏罗统自流井组陆相页岩储层孔隙结构特征

付小平; 杨滔

doi:10.11781/sysydz202104589

川东北地区下侏罗统自流井组陆相页岩储层孔隙结构特征

doi: 10.11781/sysydz202104589

付小平^1,,
杨滔²

1.
中国石化勘探分公司, 成都 610041
2.
中国石化河南油田分公司勘探开发研究院, 郑州 450046

基金项目:

国家科技重大专项 2017ZX05036

详细信息

作者简介:
付小平(1982-), 男, 工程师, 从事非常规油气地质研究。E-mail: fuxp.ktnf@sinopec.com

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-09
- 修回日期: 2021-05-28
- 刊出日期: 2021-07-28

Pore structure of continental shale reservoirs in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

FU Xiaoping^1
,,
YANG Tao²

1.
SINOPEC Exploration Company, Chengdu, Sichuan 610041, China
2.
Exploration and Development Research Institute of Henan Oilfield Branch Company, SINOPEC, Zhengzhou, Henan 450046, China

摘要

摘要: 页岩的孔隙结构对页岩气的成藏和富集有着重要的影响。通过对川东北地区下侏罗统自流井组样品的薄片观察、氩离子抛光扫描电子显微镜分析、物性测试、压汞—N₂吸附联合、X衍射全岩分析以及X衍射黏土矿物分析，对该区陆相页岩储层的孔隙结构特征进行了研究。（1）川东北地区自流井组陆相页岩的孔隙形态以平行板状孔和狭缝状孔为主，也发育墨水瓶状孔，页岩比表面积平均4.031 m²/g，总孔体积平均93.88×10^-4 mL/g，微孔隙以介孔（2~50 nm）为主；（2）页岩的比表面积与微孔、介孔孔体积存在正相关性，与大孔孔体积不存在相关性；黏土矿物中的伊—蒙混层、绿泥石与页岩比表面积和微孔孔体积呈正相关；陆相页岩TOC含量对大孔孔体积产生一定影响，与其呈一定程度的正相关；（3）自流井组大安寨段的页岩孔隙结构特征整体近似，东岳庙段依据页岩孔隙结构特征的差异可分为西北部和东南部两块，东南部东岳庙段的孔隙结构与大安寨段相似。
- 陆相页岩储层 /
- 孔隙结构 /
- 自流井组 /
- 下侏罗统 /
- 川东北地区
Abstract: The accumulation and enrichment of shale gas were significantly influenced by the pore structure of shales. In this study, thin section observation, Argon ionization-scanning electron microscopy analysis, physical property test, mercury injection-N₂ adsorption combination, X-ray diffraction whole rock analysis and X-ray diffraction clay mineral analysis were carried out to study the pore structure characteristics of continental shale of Lower Jurassic Ziliujing Fromation, northeastern Sichuan Basin. Results showed that: (1) In the Ziliujing Formation of the northeastern Sichuan Basin, the pores were mainly parallel plate and slit ones, and ink bottle pores were also developed. The average value of specific surface area of shale was 4.031 m²·g^-1, the average value of total pore volume was 93.88×10^-4 mL·g^-1, and the micro pores were dominated by meso pores (2-50 nm). (2) The specific surface area of shale is positively correlated with the volume of micro pores and meso pores, but not with the volume of macro pores. In clay minerals, illite-montmorillonite and chlorite are positively correlated with shale specific surface area and micro pore volume. The TOC content of continental shale has a certain influence on the macro pore volume, and has a positive correlation with it to a certain extent. (3) The pore structures of shale are similar in the Da'anzhai section of Ziliujing Formation. According to the difference of shale pore structure, the Dongyuemiao section can be divided into two parts: the northwestern and the southeastern. The Dongyuemiao section in the southeast is similar to the Da'anzhai section in pore structures.
- continental shale reservoir /
- pore structure /
- Ziliujing Formation /
- Lower Jurassic /
- northeastern Sichuan Basin

HTML全文

图 1 川东北地区构造及采样位置

Figure 1. Structural and sampling location in northeastern Sichuan Basin

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图 2 川东北地区采样井综合柱状图

Figure 2. Comprehensive histogram of sampling wells in northeastern Sichuan Basin

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图 3 川东北地区下侏罗统自流井组页岩孔隙形态及其对应的N₂吸附—脱附曲线

Figure 3. Pore morphology and N₂ adsorption-desorption curves of artesian shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 4 川东北地区下侏罗统自流井组页岩不同体积孔容占比及比表面积

Figure 4. Shale volume ratio and specific surface area of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 5 川东北地区下侏罗统自流井组页岩孔体积与比表面积的关系

Figure 5. Correlation between pore volume and specific surface area of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 6 川东北地区下侏罗统自流井组页岩不同黏土矿物与孔体积及比表面积的关系

Figure 6. Correlation between clay minerals and pore volume and specific surface area of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 7 川东北地区下侏罗统自流井组页岩TOC含量与比表面积及大孔孔体积的关系

Figure 7. Correlation between TOC and specific surface area and pore volume of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 8 川东北地区下侏罗统自流井组页岩有机质孔氩离子抛光显微镜下照片

Figure 8. FIB-SEM observation of organic pores in shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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图 9 川东北地区下侏罗统自流井组页岩显微镜下观察

Figure 9. Microscopical observation of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

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表 1 川东北地区下侏罗统自流井组页岩TOC、矿物组分与孔隙度统计

Table 1. Statistics of TOC, mineral composition and porosity of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

样品编号	井号	地层	ω(TOC)/%	黏土/%	石英/%	钾长石/%	斜长石/%	方解石/%	白云石/%	孔隙度/%
1	FY1	东岳庙段	1.33	61.5	23.1	0.4	2.2	5.0	0.2
2	FY1	东岳庙段	1.64	61.8	22.8	0.3	2.2	1.8	0.1
3	FY1	大安寨段	0.47	43.9	44.5	0.2	2.5	4.8	0.4
4	FY1	大安寨段		56.7	31.4	0.3	1.7	4.5	0.9
5	FY1	大安寨段	1.51	54.7	32.0	0.3	2.0	5.3	0.6
6	FY1	大安寨段	1.24	59.5	29.7	0.4	1.8	2.0	1.1
7	XL101	东岳庙段	0.58	43.1	42.7	0	9.5	0.1	0.1	0.57
8	XL101	东岳庙段	1.97	67.4	20.1	0.4	2.2	7.2	0.1
9	XL101	东岳庙段	1.96	56.1	22.3	0.4	1.9	0.8	0.2
10	XL101	东岳庙段	1.84	60.3	27.5	0.3	2.0	4.2	0.1	3.39
11	XL101	东岳庙段	1.42							4.71
12	XL101	东岳庙段	1.46	63.9	23.5	0.3	2.5	0.9	0.1
13	XL101	大安寨段		55.5	27.0	0.1	1.4	12.5	0.4
14	XL101	大安寨段	1.71	23.7	16.9	0.1	0.9	52.8	1.7
15	XL101	大安寨段	0.85	40.6	21.7	0.1	1.3	32.9	0.3
16	XL101	大安寨段		7.2	1.9	0	0	89.9	0.3	0.86
17	YL30	大安寨段	0.75	40.2	43.1	0.3	3.0	5.8	2.0	4.45
18	YL30	大安寨段		63.8	28.7	0.3	1.6	2.1	0.4	6.07
19	YL30	大安寨段	0.94	53.6	37.4	0.4	2.5	1.0	0.2	4.35
20	YL30	大安寨段	0.77	50.1	40.6	0.3	3.7	0.6	0.2	3.03
21	YL30	大安寨段								3.01
22	YL30	大安寨段								6.34
23	YL30	大安寨段								3.48
24	YL4	东岳庙段	0.68	58.0	38.0	0.4	0.6	0.5	0.5
25	YL4	东岳庙段	0.64	61.8	34.0	0.2	0.6	0.5	0.2
26	YL4	东岳庙段	0.35	50.6	41.9	0.2	1.0	0.3	0.3
27	YL4	东岳庙段	1.16	42.2	51.0	0.3	0.9	0.9	0.5
28	YL4	东岳庙段		67.3	26.0	0.5	1.1	0.8	0.2
29	YL4	东岳庙段	0.52	44.2	43.4	0.3	0.9	0.5	0.2
30	YL4	大安寨段	0.88	52.8	33.4	0.2	2.8	4.7	0.1
31	YL4	大安寨段	0.70	38.8	50.3	0.2	6.7	1.4	0.1
32	YL4	大安寨段	1.31	38.8	32.5	0.2	3.6	21.3	0.1
33	YL4	大安寨段		28.8	22.9	0.1	0.8	44.5	0.1
34	YL4	大安寨段		63.5	26.4	0.3	2.5	1.0	0.1
35	YL4	大安寨段	1.33	51.9	34.8	0.3	3.3	4.1	0.1
36	YL4	大安寨段	1.23	57.8	28.8	0.4	1.6	4.9	0.2

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表 2 川东北地区下侏罗统自流井组页岩黏土矿物含量统计

Table 2. Statistics of clay mineral content of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

样品编号	黏土矿物占黏土总含量的百分比/%				黏土矿物占全岩的百分比/%
样品编号	伊—蒙混层	伊利石	高岭石	绿泥石	伊—蒙混层	伊利石	高岭石	绿泥石
4	70	15	6	9	40	9	3	5
14	74	17	4	5	18	4	1	1
15	79	13	3	5	32	5	1	2
24	71	8	16	5	41	5	9	3
26	64	18	10	8	32	9	5	4
27	69	18	8	5	29	8	3	2
29	70	19	6	5	31	8	3	2
32	83	11	3	3	32	4	1	1
33	72	21	2	5	21	6	1	1

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表 3 川东北地区下侏罗统自流井组页岩压汞—N₂吸附联合试分析数据

Table 3. Analysis data of combined mercury injection and N₂ adsorption tests of shale in Lower Jurassic Ziliujing Formation, northeastern Sichuan Basin

样品编号	微孔孔体积/(10^-4 mL·g^-1)	介孔孔体积/(10^-4 mL·g^-1)	大孔孔体积/(10^-4 mL·g^-1)	总孔体积/(10^-4 mL·g^-1)	比表面积/(m²·g^-1)
1	7.1	40.5	17.0	64.6	1.706
2	17.4	151.1	29.6	198.1	4.462
3	33.7	86.7	9.6	130.0	8.076
4	40.5	80.8	42.9	164.2	9.125
5	7.8	54.6	31.1	93.5	1.588
6	4.8	48.9	24.1	77.8	1.010
7	13.4	26.2	6.1	45.7	3.251
8	2.7	23.6	46.4	72.7	1.048
9	6.4	39.7	18.1	64.2	1.337
10	2.3	17.1	21.8	41.2	0.772
11	4.2	31.2	35.5	70.9	2.247
12	3.2	27.2	27.5	57.9	0.863
13	4.4	36.1	37.3	77.8	1.967
14	2.9	35.3	24.6	62.8	0.693
15	4.4	36.6	25.7	66.7	1.435
16	2.8	23.1	4.4	30.3	1.534
17	22.0	42.9	19.2	84.1	4.576
18	41.4	95.6	29.0	166.0	9.717
19	31.5	60.4	18.9	110.8	6.872
20	22.2	59.2	14.0	95.4	4.953
21	16.1	40.5	14.2	70.8	3.439
22	41.4	74.7	24.3	140.4	9.344
23	20.2	45.1	12.3	77.6	4.201
24	25.8	43.7	17.7	87.2	5.369
25	32.9	60.9	11.6	105.4	7.414
26	26.9	58.8	13.3	99.0	5.852
27	16.7	36.0	13.8	66.5	3.497
28	39.1	71.9	14.5	125.5	8.780
29	20.7	41.8	8.0	70.5	4.381
30	29.5	84.0	22.0	135.5	6.918
31	22.7	53.2	12.7	88.6	4.989
32	10.5	51.0	43.0	104.5	2.206
33	5.8	43.9	38.2	87.9	1.265
34	19.2	78.5	35.5	133.2	4.411
35	14.1	62.7	23.1	99.9	3.323
36	12.4	58.1	42.0	112.5	2.486

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