川南地区五峰组—龙马溪组页岩储层纳米孔隙发育特征及其控制因素——以四川盆地南部长宁双河剖面为例

蔡苏阳; 肖七林; 朱卫平; 王晓龙; 袁贺; 陈吉; 陈淑鹏

doi:10.11781/sysydz202006920

川南地区五峰组—龙马溪组页岩储层纳米孔隙发育特征及其控制因素——以四川盆地南部长宁双河剖面为例

doi: 10.11781/sysydz202006920

1.
长江大学资源与环境学院, 武汉 430100
2.
中国石油吐哈油田公司, 新疆哈密 839009
3.
长江大学地球物理与石油资源学院, 武汉 430100
4.
中国石油勘探开发研究院, 北京 100083

基金项目:

国家科技重大专项 2017ZX05037-002

国家自然科学基金 41673041

国家自然科学基金 41403030

详细信息

作者简介:
蔡苏阳(1994-), 女, 硕士研究生, 地质工程专业。E-mail: 2369340286@qq.com

通讯作者:
肖七林(1980-), 男, 副教授, 石油地质、地球化学专业。E-mail: qilinxiao@cug.edu.cn

中图分类号: TE122.2
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出版历程
- 收稿日期: 2020-03-30
- 修回日期: 2020-11-02
- 刊出日期: 2020-11-28

Characteristics and controlling factors of nano pores in shale reservoirs of Wufeng-Longmaxi formations in southern Sichuan Basin: insights from Shuanghe outcrop in Changning area

1.
College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
2.
Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China
3.
College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China
4.
Research Institute of Petroleum Exploration and Development, Beijing 100083, China

摘要

摘要: 上奥陶统五峰组—下志留统龙马溪组页岩是四川盆地南部页岩气勘探开发的主要目的层之一。以川南长宁双河剖面为例，对该剖面41个露头样品进行了有机碳、矿物组成、二氧化碳和氮气吸附以及扫描电镜观测等分析测试，系统研究了奥陶系宝塔组灰岩和五峰组页岩以及下志留统龙马溪组页岩纳米孔隙发育特征，探讨了影响纳米孔隙发育的主要因素。五峰组—龙马溪组页岩富含有机质，矿物组成以生物成因石英和碳酸盐矿物为主，黏土矿物次之，含少量长石。五峰组—龙马溪组页岩纳米孔隙以狭缝型为主，孔径主要分布在0.3~0.9 nm、40~50 nm和100~200 nm之间，以有机孔为主，其次为矿物基质孔。纳米孔隙发育主要受有机碳、石英和碳酸盐矿物含量控制，主要表现为总孔体积与TOC和石英含量显著正相关，与碳酸盐矿物含量显著负相关，与黏土矿物和长石含量相关性不大，这表明五峰组—龙马溪组页岩内有机孔占据主导地位；奥陶系宝塔组碳酸盐矿物含量高，纳米孔隙极不发育，是上覆五峰组—龙马溪组页岩储层的良好封闭层。
- 纳米孔隙 /
- 页岩气 /
- 储层 /
- 五峰组—龙马溪组 /
- 双河剖面 /
- 四川盆地
Abstract: Shale reservoirs within the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation(Wufeng-Longmaxi shales) have been one of the main targets for shale gas exploration and exploitation in the south of Sichuan Basin. This study focuses on the Wufeng-Longmaxi shales of the Shuanghe outcrop in Changning area, southern Sichuan Basin. Measurements including TOC, mineral composition, carbon dioxide and nitrogen adsorptions and FE-SEM were conducted on 41 samples to depict the nano porosity within the Ordovician Baota limestones and Wufeng-Longmaxi shale reservoirs and hence to clarify the regulating factors of the occurrence of nano pores. The Wufeng-Longmaxi shales are rich in organic matter. The mineral composition is dominated by biogenic quartz and carbonate minerals, followed by clay minerals and a small amount of feldspar. The nano pores in Wufeng-Longmaxi shales are dominated by silts, with pore diameters mainly distributed between 0.3-0.9, 40-50 and 100-200 nm, mainly organic pores, followed by mineral matrix pores. The occurrence of nano pores is controlled by the contents of organic matter, quartz and carbonates. Total pore volumes of selected samples are strongly correlated with TOC and quartz contents positively and carbonate contents negatively, and have no correlation with clays or feldspar. This indicates that nano pores within these samples are dominated by organic matter pores. The Ordovician Baota limestones are depleted in various nano pores, hence resulting in a good underlying sealing layer of Wufeng-Longmaxi shale reservoirs.
- nano pore /
- shale gas /
- reservoir /
- Wufeng-Longmaxi formations /
- Shuanghe outcrop /
- Sichuan Basin

HTML全文

图 1 川南长宁双河剖面位置示意

据参考文献[14]修改。

Figure 1. Location of Shuanghe outcrop in Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

图 2 川南长宁双河剖面样品有机—无机矿物组成

Figure 2. Organic matter and inorganic minerals within samples collected from Shuanghe outcrop, Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 川南长宁双河剖面页岩CO₂吸附和N₂吸—脱附曲线

Figure 3. Isotherms of CO₂ adsorption and N₂ adsorption-desorption of selected samples from Shuanghe outcrop, Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 川南长宁双河剖面样品孔径分布特征

Figure 4. Pore size distribution of samples collected from Shuanghe outcrop, Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

图 5 川南长宁双河剖面页岩孔体积和比表面积

Figure 5. Pore volumes and specific surface areas of shale samples collected from Shuanghe outcrop, Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

图 6 川南长宁双河剖面页岩纳米孔FE-SEM图像

Figure 6. FE-SEM images of nano pores within shale samples from Shuanghe outcrop, Changning area, southern Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 川南长宁双河剖面页岩样品孔体积与TOC和矿物组成相关性分析统计

Table 1. Correlations between pore volumes and TOC and mineral compositions of shale samples from Shuanghe outcrop, Changning area, southern Sichuan Basin

参考文献(31)

[1]	曾祥亮, 刘树根, 黄文明, 等. 四川盆地志留系龙马溪组页岩与美国Fort Worth盆地石炭系Barnett组页岩地质特征对比[J]. 地质通报, 2011, 31(2): 372-384. doi: 10.3969/j.issn.1671-2552.2011.02.024 ZENG Xiangliang, LIU Shugen, HUANG Wenming, et al. Comparison of Silurian Longmaxi Formation shale of Sichuan Basin in China and Carboniferous Barnett Formation shale of Fort Worth Basin in United States[J]. Geological Bulletin, 2011, 31(2): 372-384. doi: 10.3969/j.issn.1671-2552.2011.02.024
[2]	黄金亮, 邹才能, 李建忠, 等. 川南志留系龙马溪组页岩气形成条件与有利区分析[J]. 煤炭学报, 2012, 37(5): 782-787. doi: 10.13225/j.cnki.jccs.2012.05.005 HUANG Jinliang, ZOU Caineng, LI Jianzhong, et al. Shale gas accumulation conditions and favorable zones of Silurian Longmaxi Formation in south Sichuan Basin, China[J]. Journal of China Coal Society, 2012, 37(5): 782-787. doi: 10.13225/j.cnki.jccs.2012.05.005
[3]	张汉荣. 川东南地区志留系页岩含气量特征及其影响因素[J]. 天然气工业, 2016, 36(8): 36-42. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201608007.htm ZHANG Hanrong. Gas content of the Silurian shale in the SE Sichuan Basin and its controlling factors[J]. Natural Gas Industry, 2016, 36(8): 36-42. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201608007.htm
[4]	毕赫, 姜振学, 李鹏, 等. 页岩储层特征及其对含气量的影响[J]. 天然气地球科学, 2014, 25(8): 1275-1283. doi: 10.11764/j.issn.1672-1926.2014.08.1275 BI He, JIANG Zhenxue, LI Peng, et al. Shale reservoir characte-ristics and its influence on gas content of Wufeng-Longmaxi formation in the southeastern Chongqing[J]. Natural Gas Geoscience, 2014, 25(8): 1275-1283. doi: 10.11764/j.issn.1672-1926.2014.08.1275
[5]	腾格尔, 申宝剑, 俞凌杰, 等. 四川盆地五峰组-龙马溪组页岩气形成与聚集机理[J]. 石油勘探与开发, 2017, 44(1): 69-78. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201701009.htm BORJIGIN Tenggeer, SHEN Baojian, YU Lingjie, et al. Mechanisms of shale gas generation and accumulation in the Ordovician Wufeng-Longmaxi formation, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2017, 44(1): 69-78. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201701009.htm
[6]	郭旭升, 胡东风, 魏志红, 等. 涪陵页岩气田的发现与勘探认识[J]. 中国石油勘探, 2016, 21(3): 24-37. doi: 10.3969/j.issn.1672-7703.2016.03.003 GUO Xusheng, HU Dongfeng, WEI Zhihong, et al. Discovery and exploration of Fuling shale gas field[J]. China Petroleum Exploration, 2016, 21(3): 24-37. doi: 10.3969/j.issn.1672-7703.2016.03.003
[7]	张正顺, 胡沛青, 沈娟, 等. 四川盆地志留系龙马溪组页岩矿物组成与有机质赋存状态[J]. 煤炭学报, 2013, 38(05): 766-771. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305009.htm ZHANG Zhengshun, HU Peiqing, SHEN Juan, et al. Mineral compositions and organic matter occurrence modes of Lower Silurian Longmaxi Formation of Sichuan Basin[J], Journal of China Coal Society, 2013, 38(05): 766-771. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305009.htm
[8]	杨峰, 宁正福, 胡昌蓬, 等. 页岩储层微观孔隙结构特征[J]. 石油学报, 2013, 34(02): 301-311. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201302013.htm YANG Feng, Ning Zhengfu, Hu Changpeng, et al. Characterization of microscopic pores structures in shale reservoirs[J]. Acta Petrolei Sinica, 2013, 34(2): 301-311. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201302013.htm
[9]	王玉满, 董大忠, 李建忠, 等. 川南下志留统龙马溪组页岩气储层特征[J]. 石油学报, 2012, 33(4): 551-561. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201204004.htm WANG Yvman, DONG Dazhong, LI Jianzhong, et al. Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan[J]. Acta Petrolei Sinica, 2012, 33(4): 551-561. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201204004.htm
[10]	熊健, 刘向君, 梁利喜. 四川盆地长宁构造地区龙马溪组页岩孔隙结构及其分形特征[J]. 地质科技情报, 2015, 34(04): 70-77. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201504011.htm XIONG Jian, LIU Xianjun, LIANG Lixi. Pore structure and fractal characteristics of Longmaxi Formation shale in the Changning region of Sichuan Basin[J]. Geological Science and Technology Information, 2015, 34(04): 70-77. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ201504011.htm
[11]	Chalmers G R, Bustin R M, Power I M. Characterization of gas shale pore systems by porosimetry, pycnometry, surface area, and field emission scanning electron microscopy/transmission electron microscopy image analyses: example from the Barnett, Woodford, Haynesville, Marcellus, and Doig units[J]. AAPG Bulletin, 2012, 96(6): 1099-1119.
[12]	潘磊, 陈桂华, 徐强, 等. 下扬子地区二叠系富有机质泥页岩孔隙结构特征[J]. 煤炭学报, 2013, 38(5): 787-793. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305013.htm PAN Lei, CHEN Guihua, XU Qiang, et al. Pore structure characte-ristics of Permian organic-rich shale in Lower Yangtze area[J]. Journal of China Coal Society, 2013, 38(5): 787-793. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305013.htm
[13]	田华, 张水昌, 柳少波, 等. 压汞法和气体吸附法研究富有机质页岩孔隙特征[J]. 石油学报, 2012, 33(3): 419-427. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201203011.htm TIAN Hua, ZHANG Shuichang, LIU Shaobo, et al. Determination of organic-rich shale pore feature by mercury injection and gas adsorption methods[J]. Acta Petrolei Sinica, 2012, 33(3): 419-427. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201203011.htm
[14]	WANG Yuman, LI Xinjing, WANG Hao, et al. Developmental characteristics and geological significance of the bentonite in the Upper Ordovician Wufeng-Lower Silurian Longmaxi formation in eastern Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2012, 19(01): 136-145.
[15]	邹才能, 董大忠, 王社教, 等. 中国页岩气形成机理、地质特征及资源潜力[J]. 石油勘探与开发, 2010, 37: 641-653. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201006003.htm ZOU Caineng, DONG Dazhong, WANG Shejiao, et al. Geological characteristics, formation mechanism and resource potential of shale gas in China[J]. Petroleum Exploration and Development, 2010, 37: 641-653. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201006003.htm
[16]	HAO F, ZOU H Y, LU Y C. Mechanisms of shale gas storage: implication for shale gas exploration in China[J]. AAPG Bulletin, 2013, 97(8): 1325-1346.
[17]	梁超, 姜在兴, 杨镱婷, 等. 四川盆地五峰组-龙马溪组页岩岩相及储集空间特征[J]. 石油勘探与开发, 2012, 39(6): 691-698. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201206007.htm LIANG Chao, JIANG Zaixing, YANG Yiting, et al. Characteristics of shale lithofacies and reservoir space of the Wufeng-Longmaxi formation, Sichuan Basin[J]. Petroleum Exploration and Development, 2012, 39(6): 691-698. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201206007.htm
[18]	张小龙, 李艳芳, 吕海刚, 等. 四川盆地志留系龙马溪组有机质特征与沉积环境的关系[J]. 煤炭学报, 2013, 38(05): 851-856. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305025.htm ZHANG Xiaolong, LI Yanfang, LU Haigang, et al. Relationship between organic matter characteristics and depositional environment in the Silurian Longmaxi Formation in Sichuan Basin[J]. Journal of China Coal Society, 2013, 38(05): 851-856. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201305025.htm
[19]	董大忠, 程克明, 王玉满, 等. 中国上扬子区下古生界页岩气形成条件及特征[J]. 石油与天然气地质, 2010, 31(3): 288-299. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201003008.htm DONG Dazhong, CHENG Keming, WANG Yuman, et al. Forming conditions and characteristics of shale gas in the Lower Paleozoic of the Upper Yangtze region, China[J]. Oil and Gas Geology, 2010, 31(3): 288-299. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201003008.htm
[20]	张瑜, 闫建萍, 贾祥娟, 等. 四川盆地五峰组-龙马溪组富有机质泥岩孔径分布及其与页岩含气性关系[J]. 天然气地球科学, 2015, 26(09): 1755-1762. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201509018.htm ZHANG Yu, YAN Jianping, JIA Xiangjuan, et al. The pore size distribution and its relationship with shale gas capacity in organic-rich mudstone of Wufeng-Longmaxi formation, Sichuan Basin[J]. Natural Gas Geoscience, 2015, 26(9): 1755-1762. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201509018.htm
[21]	郭旭升, 李宇平, 腾格尔, 等. 四川盆地五峰组-龙马溪组深水陆棚相页岩生储机理探讨[J]. 石油勘探与开发, 2020(1): 1-9. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202001021.htm GUO Xusheng, LI Yuping, TENGER, et al. Hydrocarbon generation and storage mechanisms of deep-water shelf shales of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Sichuan Basin, China[J]. Petroleum Expioration and Development, 2020(1): 1-9. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK202001021.htm
[22]	张春明, 张维生, 郭英海. 川东南-黔北地区龙马溪组沉积环境及对烃源岩的影响[J]. 地学前缘, 2012, 19(01): 136-145. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201201016.htm ZHANG Chunming, ZHANG Weisheng, GUO Yinghai. Sedimentary environment and its effect on hydrocarbon source rocks of Longmaxi Formation, southeast Sichuan and northern Guizhou[J]. Earth Science Frontiers, 2012, 19(01): 136-145. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201201016.htm
[23]	董大忠, 施振生, 孙莎莎, 等. 黑色页岩微裂缝发育控制因素: 以长宁双河剖面五峰组-龙马溪组为例[J]. 石油勘探与开发, 2018, 45(5): 763-774. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201805003.htm DONG Dazhong, SHI Zhensheng, SUN Shasha, et al. Factors controlling microfractures in black shale: a case study of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Shuanghe profile, Changning area, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2018, 45(5): 763-774. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201805003.htm
[24]	SING K S W. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (recommendations 1984)[J]. Pure and Applied Chemistry, 1985, 57(4): 603-619.
[25]	THOMMES M, KANEKO K, NEIMARK A V, et al. Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC technical report)[J]. Pure and Applied Chemistry, 2015, 87(9): 1051-1069.
[26]	BARRETTEP, JOYNER L G, HALENDA P P. The determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms[J]. Journal of the American Chemical Society, 1951, 73(1): 373-380.
[27]	BRUNAUER S, EMMETT P H, TELLER E. Adsorption of gases in multimolecular layers[J]. Journal of the American Chemical Society, 1938, 60(2): 309-319.
[28]	BERNER, R A. Sedimentary pyrite formation: an update[J]. Geochemistry & Geophysics, 1984, 48(4): 605-615.
[29]	李艳芳, 邵德勇, 吕海刚, 等. 四川盆地五峰组-龙马溪组海相页岩元素地球化学特征与有机质富集的关系[J]. 石油学报, 2015, 36(12): 1470-1483. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201512002.htm LI Yanfang, SHAO Deyong, LV Haigang, et al. A relationship between elemental geochemical characteristics and organic matter enrichment in marine shale of Wufeng Formation-Longmaxi Formation, Sichuan Basin[J]. Acta Petrolei Sinica, 2015, 36(12): 1470-1483. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201512002.htm
[30]	王淑芳, 邹才能, 黄大忠, 等. 四川盆地富有机质页岩硅质生物成因及对页岩气开发的意义[J]. 北京大学学报(自然科学版), 2014, 50(3): 476-486. https://www.cnki.com.cn/Article/CJFDTOTAL-BJDZ201403010.htm WANG Shufang, ZOU Caineng, HUANG Dazhong, et al. Biogenic silica of organic-rich shale in Sichuan Basin and its significance for shale gas[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2014, 50(3): 476-486. https://www.cnki.com.cn/Article/CJFDTOTAL-BJDZ201403010.htm
[31]	刘江涛, 李永杰, 张元春, 等. 焦石坝五峰组-龙马溪组页岩硅质生物成因的证据及其地质意义[J]. 中国石油大学学报(自然科学版), 2017, 41(01): 34-41. https://www.cnki.com.cn/Article/CJFDTOTAL-SYDX201701004.htm LIU Jiangtao, LI Yongjie, ZHANG Yuanchun, et al. Evidences of biogenic silica of Wufeng-Longmaxi formation shale in Jiaoshiba area and its geological significance[J]. Journal of China University of Petroleum, 2017, 41(1): 34-41. https://www.cnki.com.cn/Article/CJFDTOTAL-SYDX201701004.htm