鄂尔多斯盆地临兴地区本溪组铝土岩储层特征及其发育控制因素

吴见; 杨昊宇; 徐延勇; 蒋庆灵; 袁隐; 伏海蛟; 王小明; 庞智英; 吴鹏

doi:10.19509/j.cnki.dzkq.tb20230657

鄂尔多斯盆地临兴地区本溪组铝土岩储层特征及其发育控制因素

doi: 10.19509/j.cnki.dzkq.tb20230657

1 .
中联煤层气有限责任公司，北京 100011
2 .
中国地质大学（武汉）资源学院，武汉 430074

基金项目: 中联煤层气有限责任公司重点科技项目“铝土质泥岩潜力评价与工艺研究”

详细信息

作者简介:
吴见：E-mail：ilcby@163.com

通讯作者:
E-mail：yhydaze@163.com

中图分类号: P618.13
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- 文章访问数: 484
- PDF下载量: 61
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-27
- 录用日期: 2024-01-02
- 修回日期: 2023-12-21
- 网络出版日期: 2024-01-05

Reservoir characteristics and development control factors of Benxi Formation bauxite in the Linxing area of Ordos Basin

1 .
China United Coalbed Methane Co., Ltd., Beijing 100011, China
2 .
School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China

More Information

Author Bio:
E-mail：ilcby@163.com

Corresponding author: E-mail：yhydaze@163.com

摘要

摘要:
近年来，鄂尔多斯盆地陇东地区太原组铝土岩气勘探取得了重大突破，吸引了国内外的广泛关注。同期，临兴地区本溪组铝土岩气也取得了一定进展，但对于该区铝土岩储层特征及其发育控制因素认识不清，制约了勘探进程。为了明确临兴地区本溪组铝土岩的储层特征与控制因素，通过开展全岩 X 射线衍射（X-ray diffraction，简称 XRD）、铸体薄片、扫描电镜、高压压汞、氮气吸附、二氧化碳吸附、常规孔渗检测等分析手段，对铝土岩储层的矿物组成、孔隙结构、储层物性等进行了精细表征，并结合地震测井等资料对铝土岩储层发育的控制因素进行了探讨。研究表明：临兴地区本溪组铝土岩中含铝矿物主要为硬水铝石，孔隙类型主要为粒内溶孔、粒间溶孔、基质溶孔、晶间孔以及微裂隙，偶见有机质孔。此外，铝土岩孔隙体积主要由介孔和宏孔提供，孔峰分布范围主要为30～70，80～130，4000～13000 nm。再次，铝土岩储层物性条件一般，孔隙度平均为3.28%，渗透率平均为1.398×10⁻³ μm²，但底部硬水铝石含量较高层段仍具有较好的物性条件。最后，临兴地区铝土岩储层发育受控于古地貌形态、古沉积环境和成岩作用，其中，洼地和沟槽的古地貌形态和封闭−半封闭的间歇沼泽和泻湖沉积环境控制了铝土岩的富集和分布，成岩作用则是在沉积环境基础上控制了铝土岩储层储集空间类型和物性条件。研究成果可为铝土岩气勘探提供理论参考。
- 临兴地区 /
- 本溪组 /
- 铝土岩储层 /
- 储层特征 /
- 储层发育控制因素
Abstract: <p>In recent years, the bauxite gas exploration of the Taiyuan Formation in the Longdong area of Ordos Basin has made a breakthrough, which has attracted wide attention at home and abroad. During the same period, the bauxite rock gas of the Benxi Formation in the Linxing area has also made some progress; however, the characteristics and controlling factors of the bauxite reservoir in this area remain unclear, which restricts the exploration process. </p></sec><sec><title>Objective
To identify the reservoir characteristics and influencing factors of Benxi Formation bauxite in the Linxing area,
Methods
the paper carried out X-ray diffraction (XRD), cast sheet imaging, scanning electron microscope-energy-dispersive spectrometer (SEM-EDS), mercury intrusion porosimetry, nitrogen and carbon dioxide adsorption, and routine porosity measurements, coupled with seismic logging data, to characterize the mineral composition, pore structure, and physical properties of the bauxite reservoir and to discuss the controls on its development.
Result
The results show that the aluminum-bearing minerals in Benxi Formation bauxite in the Linxing area are dominated by diaspore. Pore types are primarily intra-granular, intergranular, matrix, and microcrack pores, with occasional organic pores. Pore volume is mainly contributed by mesopores and macropores, with pore-size peaks mainly at 30−70, 80−130, 4000−13000 nm. The overall reservoir physical properties are modest, with an average porosity of 3.28% and an average permeability of 1.398×10⁻³ μm². However, the lower part of the section, which has a higher diaspore content, exhibits relatively better properties. Finally, the development of the Linxing bauxite reservoir is controlled by palaeo-geomorphology, palaeo-sedimentary environment, and diagenesis. Specifically, accumulation and distribution of bauxite are controlled by the paleogeomorphology of depressions and troughs and by enclosed to semi-enclosed intermittent swamps and lagoons. Diagenesis determines the reservoir-space types and the resulting physical-property conditions within the sedimentary context.
Conclusion
The research results can provide theoretical guidance for the bauxite gas exploration.
- Linxing area /
- Benxi Formation /
- bauxite reservoir /
- reservoir characteristics /
- controlling factor of reservoir development

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图 1 鄂尔多斯盆地临兴地区地质综合图

a. 鄂尔多斯盆地构造单元及临兴地区位置，据文献[12]修改；b. 临兴地区A井柱状图。GR. 自然伽马；CNCF. 补偿中子；ZDEN. 密度；M2RX. 高分辨感应电阻率；下同

Figure 1. Geological comprehensive map of Linxing area, Ordos Basin

下载: 全尺寸图片幻灯片

图 2 临兴地区本溪组铝土岩矿物特征

a. 2002.31 m，单偏光，鲕粒结构；b. 2002.97 m，单偏光，碎屑状硬水铝石，具有定向性；c. 2003.15 m，单偏光，硬水铝石微晶集合体基质溶孔；d. 2003.15 m，扫描电镜，黏土矿物填充于溶蚀孔；e. 1999.85 m，单偏光，自生黄铁矿；f. 2003.15 m，扫描电镜，草莓状黄铁矿发育晶间孔

Figure 2. Mineral characteristics of Benxi Formation bauxite rock in the Linxing area

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图 3 临兴地区A井本溪组铝土岩孔隙特征

a. 1996.43 m，碎屑矿物溶蚀孔被黏土矿物充填；b. 2003.15 m，硬水铝石粒间溶孔；c. 2003.15 m，粒间孔内充填硬水铝石和黏土矿物等；d. 2003.15 m，硬水铝石晶间孔和微裂隙；e. 1999.85 m，黄铁矿晶间孔和有机质孔；f. 2002.31 m，黏土矿物晶间孔；g. 2000.07 m，有机质孔；h. 2000.07 m，金红石微孔隙以及微裂隙

Figure 3. Pore characteristics in Benxi Formation bauxite rock of Well A in the Linxing area

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图 4 本溪组铝土岩储层孔隙结构分析（1～10均为样品编号，下同）

Figure 4. Pore structure of Benxi Formation bauxite reservoir

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图 5 本溪组铝土岩储层孔径分布图

Figure 5. Aperture distribution diagram of Benxi Formation bauxite reservoir

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图 6 矿物含量与储层物性参数相关性图

Figure 6. Correlation diagram of mineral content and reservoir physical-property parameters

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图 7 临兴地区A井铝土岩段全烃曲线（1～10. 样品编号）

Figure 7. Total hydrocarbon curve for bauxite section of Well A in the Linxing area

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图 8 临兴地区本溪组铝土岩分布与古地貌图

a. 铝土岩厚度分布图；b. 沉积期古地貌图；c. 深度域古地貌叠合铝土岩厚度图

Figure 8. Bauxite distribution and paleogeomorphological map of Benxi Formation in the Linxing area

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图 9 临兴地区铝土岩成岩作用阶段（据文献[33]修改；R_o. 镜质体反射率；S. 蒙脱石）

Figure 9. Diagenetic stage of bauxite rock in the Linxing area

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表 1 临兴地区本溪组铝土岩XRD分析结果

Table 1. XRD analysis results of Benxi Formation bauxite rock in the Linxing area

取心井	样品编号	深度/m	石英	钛质矿物		铁质矿物		黏土矿物			铝质矿物	伊/蒙混层比(I/S)
			石英	锐钛矿	金红石	黄铁矿	赤铁矿	高岭石	伊利石	伊蒙混层	硬水铝石
				w_B/%
A	1	1992.82	16.99	/	/	/	/	40.13	9.33	/	33.55	/
	2	1993.86	27.64	/	/	5.76	/	29.58	/	/	37.02	/
	3	1995.09	/	2.40	/	/	29.73	34.14	4.21	/	29.52	/
	4	1996.43	/	3.69	/	/	2.12	21.78	/	44.25	28.16	80%∶20%
	5	1998.73	3.65	2.81	/	/	1.21	26.54	/	26.95	38.84	80%∶20%
	6	1999.85	/	14.71	/	1.68	/	37.26	1.24	/	45.11	/
	7	2000.07	0.97	2.31	0.1	/	0.80	28.84	/	28.85	38.13	80%∶20%
	8	2002.31	2.44	/	/	/	4.90	41.63	6.17	/	44.86	/
	9	2002.97	/	7.11	0.1	/	4.81	45.91	4.73	/	37.34	/
	10	2003.15	/	/	0.1	14.34	/	10.18	/	/	75.38	/
B	11	2054.80	2.9	2.82	/	/	3.14	53.97	/	21.70	15.47	80%∶20%
	12	2059.20	2.14	4.89	/	/	1.68	55.50	/	/	35.79	/
	13	2065.80	/	5.70	/	/	/	20.87	/	/	73.43	/
C	14	2343.30	3.39	4.23	/	/	1.28	71.35	/	/	19.75	/
	15	2348.20	/	3.12	/	/	/	62.51	3.13	/	31.24	/
	16	2350.80	/	/	/	/	17.32	34.70	/	/	47.98	/
平均		/	3.76	3.36	0.02	1.36	4.19	35.43	4.80	7.61	39.47	80%∶20%

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表 2 临兴地区A井本溪组铝土岩储层低温气体吸附与高压压汞实验孔隙参数

Table 2. Pore parameters from low-temperature gas adsorption and mercury intrusion porosimetry experiments in Benxi Formation bauxite reservoir of Well A in the Linxing area

样品编号	深度/m	CO₂ 吸附			N₂ 吸附			高压压汞
样品编号	深度/m	孔隙体积/(cm³·g⁻¹)	比表面积/(m²·g⁻¹)	孔径/nm	孔隙体积/(cm³·g⁻¹)	比表面积/(m²·g⁻¹)	孔径/nm	孔隙体积/(cm³·g⁻¹)	比表面积/(m²·g⁻¹)	孔径/nm
1	1992.82	0.021	25.372	0.472	0.135	38.748	12.529	0.0033	0.359	37.12
2	1993.86	0.020	25.227	0.472	0.128	35.721	12.897	0.0027	0.248	43.46
3	1995.09	0.013	15.509	0.507	0.090	20.558	14.805	/	/	246.60
4	1996.43	0.018	23.122	0.489	0.125	32.730	13.549	0.0028	0.046	22.62
5	1998.73	0.022	29.597	0.472	0.143	39.550	12.751	0.0029	0.509	/
6	1999.85	0.018	20.420	0.489	0.104	25.375	14.185	0.0001	0.0001	188.60
7	2000.07	0.020	23.533	0.489	0.136	35.632	13.733	0.0010	0.021	354.29
8	2002.31	0.018	20.689	0.489	0.120	31.425	13.845	0.0002	0.003	429.94
9	2002.97	0.017	21.706	0.489	0.121	30.053	14.332	0.0007	0.006	14.56
10	2003.15	0.011	11.802	0.507	0.062	14.416	15.607	0.0035	0.955	37.12
平均	/	0.018	21.698	0.488	0.116	30.421	13.966	0.0019	0.239	246.85

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表 3 临兴地区A井本溪组铝土岩储层物性参数

Table 3. Reservoir physical properties of Benxi Formation bauxite rock of Well A in the Linxing area

样品编号	深度/m	孔隙度/%	渗透率/10⁻³μm²
1	1992.82	1.7	1.212
2	1993.86	1.5	0.494
3	1995.09	2.6	0.922
4	1996.43	0.5	0.203
5	1998.73	3.45	0.604
6	1999.85	4.1	1.924
7	2000.07	0.9	0.128
8	2002.31	5.5	2.224
9	2002.97	2.6	1.853
10	2003.15	9.9	4.418
平均	/	3.28	1.398
陇东地区^[8]	/	10.65	4.040

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