鄂尔多斯盆地西缘奥陶系乌拉力克组海相页岩气储层甜点分类评价

张琳琳; 王孔杰; 赖枫鹏; 郭伟; 苗丽丽

doi:10.11781/sysydz202401191

鄂尔多斯盆地西缘奥陶系乌拉力克组海相页岩气储层甜点分类评价

doi: 10.11781/sysydz202401191

张琳琳^{1, 2,},
王孔杰³,
赖枫鹏^{1, 2, ,},
郭伟⁴,
苗丽丽⁵

1.
中国地质大学(北京) 能源学院, 北京 100083
2.
非常规天然气能源地质评价与开发工程北京市重点实验室, 北京 100083
3.
中国石油川庆钻探工程有限公司长庆井下技术作业公司, 西安 710016
4.
中国石油长城钻探工程有限公司地质研究院, 辽宁盘锦 124010
5.
中国地质大学(北京), 北京 100083

基金项目:

国家自然科学基金项目“页岩油藏CO₂复合压裂渗吸—渗流机理及排采制度优化研究” 52174037

详细信息

作者简介:
张琳琳(1999-), 女, 硕士生, 从事油气田开发理论与方法研究。E-mail: zhangllinn@163.com

通讯作者:
赖枫鹏(1981-), 男, 教授, 从事非常规油气、油气田开发理论与方法研究。E-mail: laifengpeng@163.com

中图分类号: TE132.2
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- 被引次数: 0
出版历程
- 收稿日期: 2023-01-15
- 修回日期: 2023-11-20
- 刊出日期: 2024-01-28

Classification and evaluation of sweet spots of marine shale gas reservoir in Ordovician Wulalike Formation on the westen margin of Ordos Basin

ZHANG Linlin^{1, 2
,},
WANG Kongjie³,
LAI Fengpeng^{1, 2
, ,},
GUO Wei⁴,
MIAO Lili⁵

1.
School of Energy, China University of Geosciences (Beijing), Beijing 100083, China
2.
Beijing Key Laboratory of Unconventional Natural Gas Energy Geological Evaluation and Development, Beijing 100083, China
3.
Changqing Downhole Technology Operation Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Xi'an, Shaanxi 710016, China
4.
Geology Research Institute of GWDC, PetroChina, Panjin, Liaoning 124010, China
5.
China University of Geosciences (Beijing), Beijing 100083, China

摘要

摘要: 甜点评价对页岩气藏高效勘探开发具有重要意义。以鄂尔多斯盆地西缘奥陶系乌拉力克组页岩储层为研究对象，通过岩石薄片分析、X射线衍射、SEM扫描电镜、低温氮气吸附、等温吸附、总有机碳(TOC)含量、有机质镜质体反射率(R_o)测试和三轴岩石力学测试8个实验，得到目标区岩石类型为灰褐色泥页岩，孔径集中分布在2~4 nm和35~61 nm，主要发育粒间孔、黏土矿物层间孔和粒内孔；总有机碳含量平均为1.01%，R_o值平均为1.75%，脆性指数平均为47.8%。通过分析不同因素对页岩储层甜点区评选及评价的影响，认为硅质矿物含量、黏土矿物含量、孔比表面积、总有机碳含量和R_o值对储层的吸附性能起决定作用，孔径大小和孔隙类型数量控制储层的储集性能，脆性矿物含量和岩石力学参数影响储层的可压性。根据地质甜点评价的吸附性能和储集性能两个指标以及工程甜点的可压性指标，完成了不同特征对应的参数指标细分类，初步建立了鄂尔多斯盆地西缘奥陶系乌拉力克组海相页岩气储层3个等级的地质甜点和可压性甜点的分类评价方案，结果表明目标区各特征参数均达到Ⅱ级标准，可以作为页岩气开发甜点区。
- 评价分类 /
- 室内实验 /
- 储层甜点 /
- 海相页岩气 /
- 乌拉力克组 /
- 奥陶系 /
- 鄂尔多斯盆地
Abstract: Sweet spot evaluation is of great significance for efficient exploration and development of shale gas reservoirs. Taking the shale reservoir in Ordovician Wulalike Formation on the western margin of the Ordos Basin as the research object, eight experiments including rock section analysis, X-ray diffraction, SEM scanning electron microscopy, low-temperature nitrogen adsorption, isothermal adsorption, total organic carbon (TOC) content test, organic matter vitrinite reflectance (R_o) test and triaxial rock mechanics test were carried out in this study. It is found that the rock type in the target area is gray brown mud shale, with the pore size in the ranges of 2-4 nm and 35-61 nm, and intergranular pores, clay mineral interlayer pores and intragranular pores are developed. The TOC content is 1.01%, the average R_o value is 1.75%, and the brittleness index is 47.8%. By analyzing the influence of different factors on the selection and evaluation of shale reservoir sweet spots, it is concluded that the content of siliceous minerals, clay minerals, pore specific surface area, TOC content and R_o value play a decisive role on the adsorption perfor-mance of the reservoir, the pore size and the number of pore types control the reservoir property, the content of brittle minerals and rock mechanics parameters affect the compressibility of the reservoir. According to the two indexes of adsorption property and reservoir property evaluated by geological sweet spots and the compressibility index of engineering sweet spots, the parameter indexes corresponding to different characteristics are finely classified, and a classification and evaluation scheme of geological sweet spots and compressibility sweet spots of the marine shale gas reservoir in Ordovician Wulalike Formation in the Ordos Basin is preliminarily established. The results show that all characteristic para-meters in the target area meet the grade Ⅱ standard. It could be a sweet spot for shale gas development.
- evaluation and classification /
- laboratory experiment /
- reservoir sweet spot /
- marine shale gas /
- Wulalike Formation /
- Ordovician /
- Ordos Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’Contributions

张琳琳完成实验操作，参与论文撰写及修改；王孔杰参与实验设计；赖枫鹏参与实验设计和论文修改；郭伟和苗丽丽完成实验操作。所有作者均阅读并同意最终稿件的提交。

ZHANG Linlin completed experimental operation, and participated in manuscript drafting and modification. WANG Kongjie participated in experimental design. LAI Fengpeng participated in experimental design and manuscript modification. GUO Wei and MIAO Lili completed expe-rimental operation. All the authors have read the last version of paper and consented for submission.

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图 1 鄂尔多斯盆地构造区划及研究区位置^[27]

Figure 1. Tectonic units of Ordos Basin and location of study area

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图 2 光学显微镜下的矿物分布

a.R3样品，黄铁矿散状分布；b.R4样品，细小的石英颗粒、铁白云石混杂分布；c.R1样品，有机质条带定向排列；d.R2样品，零星分布的铁白云石颗粒和石英颗粒。

Figure 2. Mineral distribution under light microscope

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图 3 X射线衍射实验矿物含量

Figure 3. Mineral contents obtained by X-ray diffraction experiment

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图 4 X射线衍射实验黏土矿物含量

Figure 4. Clay mineral contents obtained by X-ray diffraction experiment

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图 5 样品扫描电镜实验结果

a.R1样品，发育粒间孔；b.R2样品，发育黏土矿物层间孔；c.R1样品，黄铁矿内的晶间孔；d.R4样品，发育黏土矿物层间孔；e.R5样品，发育粒间孔；f.R6样品，发育黄铁矿及粒内孔。

Figure 5. SEM results of the samples

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图 6 微孔孔径分布

Figure 6. Pore size distribution of micropores

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图 7 样品等温吸附曲线

Figure 7. Isothermal adsorption curves of samples

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图 8 泥页岩有机质类型频率分布

Figure 8. Histogram of frequency distribution of mud shale organic matter types

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表 1 实验样品孔渗数据

Table 1. Pore and permeability data of experimental samples

样品编号	深度/m	孔隙度/%	渗透率/10^-3 μm²
R1	2 861.90	2.11	0.062
R2	2 861.90	2.47	0.085
R3	2 864.43	1.64	0.077
R4	2 864.43	1.73	0.910
R5	2 864.90	1.97	0.590
R6	2 864.90	2.08	0.053

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表 2 低温氮气吸附测试孔径解释结果

Table 2. Pore size interpretation results of low temperature nitrogen adsorption test

样品编号	BET		BJH吸附	BJH脱附
样品编号	比表面积/ (cm²/g)	平均孔径/ nm	平均孔径/ nm	平均孔径/ nm
R1	13.46	12.99	13.08	12.13
R2	15.37	13.12	13.64	12.14
R3	19.66	7.78	8.90	7.43
R4	18.46	8.31	9.63	7.94
R5	17.19	9.97	10.08	9.55
R6	16.83	10.33	11.70	10.25

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表 3 样品总有机碳含量测定和等温吸附实验数据

Table 3. TOC content determination and isothermal adsorption test data

样品编号	总有机碳含量/%	等温吸附实验数据
样品编号	总有机碳含量/%	最大气体绝对吸附量/(m³/t)	兰氏体积/ (m³/t)	兰氏压力/ MPa	吸附相密度/ (g/mL)
R1	0.85	0.74	0.98	15.38	0.29
R2	0.91	0.93	1.04	13.44	0.25
R3	1.14	1.19	1.26	14.57	0.27
R4	1.09	1.18	1.12	11.21	0.27
R5	1.03	1.13	1.07	12.33	0.26
R6	1.01	1.07	1.11	14.08	0.28

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表 4 样品三轴应力实验结果

Table 4. Triaxial stress test results of the samples

参数	样品编号
参数	R1	R2	R3	R4	R5	R6
杨氏模量/GPa	39.6	42.9	43.8	41.5	40.8	40.2
泊松比	0.18	0.23	0.24	0.23	0.22	0.19
脆性指数/%	56.36	47.99	46.43	47.30	48.95	54.66
最大水平主应力/MPa	81.72	79.77	79.58	80.12	80.67	81.22
最小水平主应力/MPa	75.60	73.59	73.21	74.30	74.88	75.21
水平应力差/MPa	6.12	6.18	6.37	5.82	5.79	6.01
最小水平主应力梯/(MPa/m)	0.026 4	0.025 7	0.025 6	0.025 9	0.026 1	0.026 3

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表 5 鄂尔多斯盆地海相页岩气储层地质甜点分类评价

Table 5. Classification and evaluation of geological sweet spots of marine shale gas reservoir in Ordos Basin

参数		储层分类
参数		Ⅰ级	Ⅱ级	Ⅲ级
吸附性能	硅质矿物含量/%	＞45	35~45	＜35
	黏土矿物含量/%	＞45	35~45	＜35
	孔比表面积/(cm²/g)	＞14.1	5.2~14.1	＜5.2
	总有机碳含量/%	＞0.7	0.5~0.7	＜0.5
	R_o/%	2.6~3.5	0.7~2.6	＜0.7或>3.5
储集性能	孔径大小/nm	＞50	2~50	＜2
储集性能	孔隙类型数量	发育的孔隙类型多于3种	至少发育一种孔径在介孔及介孔以上的孔隙	发育的孔隙孔径均以微孔为主

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表 6 鄂尔多斯盆地海相页岩气储层可压性甜点分类评价

Table 6. Classification and evaluation of compressibility sweet spots of marine shale gas reservoir in Ordos Basin

参数	储层分类
参数	Ⅰ级	Ⅱ级	Ⅲ级
脆性指数/%	＞50	35~50	＜35
地应力差异系数	0~0.3	0.3~0.5	＞0.5

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