桂北地区下石炭统鹿寨组页岩储层孔隙特征及评价

doi:10.13809/j.cnki.cn32-1825/te.2022.03.005

油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (3): 437-444.doi: 10.13809/j.cnki.cn32-1825/te.2022.03.005

桂北地区下石炭统鹿寨组页岩储层孔隙特征及评价

陶金雨^1,^2,^3,⁴(),申宝剑^1,^2,^3,⁴,胡宗全⁵,潘安阳^1,^2,^3,⁴

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. 页岩油气富集机理与有效开发国家重点实验室,江苏无锡 214126
3. 国家能源页岩油研发中心,江苏无锡 214126
4. 中国石化油气成藏重点实验室,江苏无锡 214126
5. 中国石化石油勘探开发研究院,北京 100083

收稿日期:2020-11-04 发布日期:2022-06-24 出版日期:2022-06-26
作者简介:陶金雨（1990—）,女,博士,副研究员,从事沉积—储层地质研究工作。地址：江苏省无锡市滨湖区蠡湖大道2060号,邮政编码：214126。E-mail: taojinyu.syky@sinopec.com
基金资助:
国家自然科学基金联合基金“古生界页岩含气性原生有机质控制作用研究”(U19B6003);国家自然科学基金重大项目“页岩气改造—散失途径与保存条件”(41690133);中国石化科技部项目“四川盆地外围前中生界页岩气资源潜力评价与区带优选”(P19017-4)

Pore characteristics and evaluation of shale reservoir in Lower Carboniferous Luzhai Formation, northern part of middle Guangxi Depression

TAO Jinyu^1,^2,^3,⁴(),SHEN Baojian^1,^2,^3,⁴,HU Zongquan⁵,PAN Anyang^1,^2,^3,⁴

1. Sinopec Wuxi Research Institute of Petroleum Geology, Wuxi, Jiangsu 214126, China
2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China
3. State Energy Center for Shale Oil Research and Development, Wuxi, Jiangsu 214126, China
4. Sinopec Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China
5. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China

Received:2020-11-04 Online:2022-06-24 Published:2022-06-26

摘要/Abstract

摘要：

桂中坳陷上古生界海相页岩经历了复杂的构造演化和热演化,下石炭统泥页岩系作为页岩气的主力产层,其储层的微观孔隙结构表征与储层孔隙评价是亟待研究的重要内容。通过对野外和岩心样品开展岩石薄片、扫描电镜、全岩X衍射、孔隙度以及等温吸附等试验测试,对桂中坳陷北部下石炭统鹿寨组页岩储层的物质组成和储集孔隙进行了详细表征与评价。研究表明,桂北地区鹿寨组页岩的有机碳含量0.4 % ~ 6.6 %,有机质处于高成熟—过成熟热演化阶段,石英等脆性矿物含量较高,具备良好的可压裂性。鹿寨组页岩储层的孔隙度平均2.91 %,渗透率平均0.007 9 ×10^-3μm²,属于低孔—特低渗—较好突破压力的页岩气储层。页岩储层的储集孔隙有残余粒间孔、晶间孔、粒内溶孔、黏土矿物层间孔和有机孔5种类型,主要的贡献者为黏土矿物层间孔、有机孔和黄铁矿晶间孔,孔径17 ~ 65 nm,以小于50 nm的微孔和介孔为主,孔隙之间的连通性较差,孔隙内部具有一定连通性。

关键词: 页岩, 储层评价, 微观孔隙, 下石炭统, 桂中坳陷

Abstract:

The upper Paleozoic Marine shale in middle Guangxi Depression, namely Guizhong Depression, has experienced complex tectonic evolution and thermal evolution. As the main production layer of shale gas, the microscopic pore structure characterization and reservoir pore evaluation of the shale in lower Carboniferous need to be studied urgently. Focus on the Lower Carboniferous Luzhai Formation shale reservoir in the northern Guizhong Depression, the material composition and reservoir pores of the shale are characterized and evaluated in detail by rock thin section, scanning electron microscope, Xray diffraction, porosity and isothermal adsorption tests on samples both from fields and cores. The results show that the TOC in the shale of Luzhai Formation is 0.4 % ~ 6.6 %. The organic matter is in the stage of high mature to over-mature thermal evolution. The content of brittle minerals such as quartz is high, with a good fracturing ability. The shale in Luzhai Formation, with an average porosity of 2.91 % and an average permeability of 0.007 9 ×10^-3μm², is a kind of low porosity, ultra-low permeability and good breakthrough pressure shale gas reservoir. There are five types of pores in the shale reservoir: the residual intergranular pore, intergranular pore, intragranular dissolved pore, clay minerals interlayer pore and organic pore. The main contributors are the clay minerals interlayer pores, the organic pores and the pyrite intergranular pores. The aperture rangs from 17 nm to 65 nm, most of which are microporous or mesoporous with the scale less than 50 nm. The connectivity between the pores is poor and there is a certain connectivity inside the pores.

Key words: shale, reservoir evaluation, microscopic pores, Lower Carboniferous, middle Guangxi Depression（Guizhong Depression）

中图分类号:

TE122

陶金雨,申宝剑,胡宗全等. 桂北地区下石炭统鹿寨组页岩储层孔隙特征及评价[J]. 油气藏评价与开发, 2022, 12(3): 437-444.

Jinyu TAO,Baojian SHEN,Zongquan HU, et al. Pore characteristics and evaluation of shale reservoir in Lower Carboniferous Luzhai Formation, northern part of middle Guangxi Depression[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(3): 437-444.

图/表 11

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井	层位	孔隙度（%）	渗透率（10^-6μm²）	出处
QY2井	C₁	2.36	9.1	文献[22]
DY1井	C₁	4.96		文献[23]
CY1井	C₁	1.82	3.3	文献[24]
HY1井	C₁	4.49	18.7	文献[12]
DY2井	C₁lz	4.04		文献[25]
YY井	C₁lz	1.39	8.0	本次研究
GLD井	C₁lz	1.37	0.7	本次研究

编号	岩性	深度（m）	TOC（%）	R_O （%）	孔体积（mL/g）				孔体积所占比例			比表面积（m²/g）
编号	岩性	深度（m）	TOC（%）	R_O （%）	微孔	介孔	大孔	总孔容	微孔	介孔	大孔	比表面积（m²/g）
1-YY	深灰色泥质灰岩	3 083.01	0.29		0.000 5	0.001 4	0.001 1	0.002 9	15.36	47.44	37.2	1.239
2-YY	深灰色钙质泥岩	3 075.51	1.76	3.83	0.004 9	0.005 6	0.002 0	0.012 6	39.01	44.75	16.24	10.408
3-YY	灰黑色碳质泥岩	3 090.07	2.73		0.003 5	0.004 8	0.002 2	0.010 4	33.14	45.79	21.07	7.238
4-YY	灰黑色碳质泥岩	3 092.51	3.28	4.05	0.002 5	0.002 8	0.003 0	0.008 3	30.05	33.77	36.18	5.436
5-GLD	黑色硅质泥岩	1 875.70	4.83	2.42	0.001 6	0.002 1	0.001 1	0.004 8	33.95	42.86	23.19	3.641
平均值			2.58	3.43	0.002 6	0.003 3	0.001 9	0.007 8	30.30	42.92	26.78	5.592

桂北地区下石炭统鹿寨组页岩储层孔隙特征及评价

Pore characteristics and evaluation of shale reservoir in Lower Carboniferous Luzhai Formation, northern part of middle Guangxi Depression

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