Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy

Yu WANG; Li-hua WANG; Jian-qiang WANG; Yan-fei WANG

doi:10.15898/j.cnki.11-2131/td.202003110030

2020 Vol. 39, No. 4

Article Contents

Article navigation > Rock and Mineral Analysis > 2020 > 39(4): 566-577

Next Article Previous Article

Yu WANG, Li-hua WANG, Jian-qiang WANG, Yan-fei WANG. Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy[J]. Rock and Mineral Analysis, 2020, 39(4): 566-577. doi: 10.15898/j.cnki.11-2131/td.202003110030

Citation:

Yu WANG, Li-hua WANG, Jian-qiang WANG, Yan-fei WANG. Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy[J]. Rock and Mineral Analysis, 2020, 39(4): 566-577. doi: 10.15898/j.cnki.11-2131/td.202003110030

Investigation on Pore Structures of Yanchang Formation Shale Using Micro X-ray Microscopy

1.
Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2.
University of Chinese Academy of Sciences, Beijing 100049
3.
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 11 March 2020

Revised Date: 12 April 2020

Accepted Date: 23 April 2020

Abstract

Abstract

BACKGROUNDShale pore structure is the key to determine reservoir storage and migration capacity. It is of great significance for improving the productivity assessment of continental shale gas in China, and fracturing technology. OBJECTIVESTo investigate the pore structure and three dimensional distribution mode of the seventh member of Yanchang Formation shale and its controlling factors. METHODSAr-ion milling SEM and synchrotron micro X-ray microscopy were used to characterize the pore structures. RESULTSThe SEM results indicated that the interparticle pores (300-600nm) and micro-fractures were the main reservoir space of the seventh member of Yanchang Formation shale gas. Most of the micro-fractures were formed by the precipitation of clay minerals and presented as a flat shape, which likely caused collapse of borehole walls. Organic pores were less developed and mainly associated with organic clay minerals. The micro X-ray microscopy showed that the seventh member of Yanchang Formation shale had laminated structures at micro-scale with organic matter laminations of 10-20μm in thickness. The results indicated that the seventh member shale had strong plasticity, which was against horizontal fracturing. CONCLUSIONSThe results can provide significant data support for developing a percolation model and improving fracturing technology of shale gas.
- micro X-ray microscopy /
- Ar-ion milling /
- micro-nano pores /
- three dimensional structures /
- laminated textures /
- Terrestrial Yanchang Formation shale

FullText(HTML)

References

[1]	周庆凡, 金之钧, 杨国丰, 等.美国页岩油勘探开发现状与前景展望[J].石油与天然气地质, 2019, 40(3):469-477. Google Scholar Zhou Q F, Jin Z J, Yang G F, et al.Shale oil exploration and production in the U.S.:Status and outlook[J].Oil & Gas Geology, 2019, 40(3):469-477. Google Scholar
[2]	Tarnawski M.American experience with shale gas[J].Studies in Politics and Society, 2018, 16(1):26-37. Google Scholar
[3]	Zou C N, Dong D Z, Wang Y M, et al.Shale gas in China:Characteristics, challenges and prospects (Ⅱ)[J].Petroleum Exploration and Development, 2016, 43(2):182-196. doi: 10.1016/S1876-3804(16)30022-2 CrossRef Google Scholar
[4]	吴辰泓, 高胜利, 高潮.鄂尔多斯盆地陆相页岩气特殊性及面临的挑战[J].非常规油气, 2017, 4(2):64-72. Google Scholar Wu C H, Gao S L, Gao C.Characteristics and challenges of continental shale gas in Ordos Basin[J].Unconventional Oil & Gas, 2017, 4(2):64-72. Google Scholar
[5]	Yang C, Zhang J C, Tang X, et al.Comparative study on micro-pore structure of marine, terrestrial, and transitional shales in key areas, China[J].International Journal of Coal Geology, 2017, 171:76-92. doi: 10.1016/j.coal.2016.12.001 CrossRef Google Scholar
[6]	Wang Y, Wang L H, Wang J Q, et al.Characterization of organic matter pores in typical marine and terrestrial shales, China[J].Journal of Natural Gas Science and Engineering, 2018, 49:56-65. doi: 10.1016/j.jngse.2017.11.002 CrossRef Google Scholar
[7]	庞铭, 陈华兴, 唐洪明, 等.海相页岩与陆相页岩微观孔隙结构差异——以川南龙马溪组、鄂尔多斯延长组为例[J].天然气勘探与开发, 2018, 41(2):29-36. Google Scholar Pang M, Chen H X, Tang H M, et al.Differences of micropore structure between marine shale and continental shale:Examples from Longmaxi Formation in Southern Sichuan Basin and Yanchang Formation in Ordos Basin[J].Natural Gas Exploration and Development, 2018, 41(2):29-36. Google Scholar
[8]	杨巍, 陈国俊, 吕成福, 等.鄂尔多斯盆地东南部延长组长7段富有机质页岩孔隙特征[J].天然气地球科学, 2015, 26(3):418-426. Google Scholar Yang W, Chen G J, Lü C F, et al.Micropore characteristics of the organic-rich shale in the 7th Member of the Yanchang Formation in the southeast of Ordos Basin[J].Natural Gas Geosciences, 2015, 26(3):418-426. Google Scholar
[9]	王金月, 鞠玮, 申建, 等.鄂尔多斯盆地定边地区延长组长7₁储层构造裂缝分布预测[J].地质与勘探, 2016, 52(5):966-973. Google Scholar Wang J Y, Ju W, Shen J, et al.Quantitative prediction of tectonic fracture distribution in the Chang 7₁ reservoirs of the Yanchang Formation in the Dingbian area, Ordos Basin[J].Geology and Exploration, 2016, 52(5):966-973. Google Scholar
[10]	Cao G H, Lin M, Jiang W B, et al.A 3D coupled model of organic matter and inorganic matrix for calculating the permeability of shale[J].Fuel, 2017, 204:129-143. doi: 10.1016/j.fuel.2017.05.052 CrossRef Google Scholar
[11]	Liu S M, Zhang R, Karpyn Z, et al.Investigation of acce-ssible pore structure evolution under pressurization and adsorption for coal and shale using small-angle neutron scattering[J]. Energy & Fuels, 2019, 33(2):837-847. Google Scholar
[12]	Loucks R G, Reed R M, Ruppel S C, et al.Spectrum of pore types for matrix-related mud pores[J].AAPG Bulletin, 2012, 96(6):1071-1098. doi: 10.1306/08171111061 CrossRef Google Scholar
[13]	Wang Y, Wang L H, Wang J Q, et al.Investigating micro-structure of Longmaxi Shale in Shizhu area, Sichuan Basin, by optical microscopy, scanning electron microscopy and micro-computed tomography[J].Nuclear Science and Techniques, 2017, 28(11):163. doi: 10.1007/s41365-017-0317-5 CrossRef Google Scholar
[14]	王跃鹏, 刘向君, 梁利喜.鄂尔多斯盆地延长组张家滩陆相页岩各向异性及能量演化特征[J].岩性油气藏, 2019, 31(5):149-160. Google Scholar Wang Y P, Liu X J, Liang L X.Anisotropy and energy evolution characteristics of Zhangjiatan continental shale of Yanchang Formation in Ordos Basin[J].Lithologic Reservoirs, 2019, 31(5):149-160. Google Scholar
[15]	吴银辉, 周文, 陈文玲, 等.鄂尔多斯盆地长7段泥页岩储层物性特征及控制因素研究[J].石油化工应用, 2017, 36(12):78-83. Google Scholar Wu Y H, Zhou W, Chen W L, et al.Physical properties and controlling factors of shale reservoir in Chang 7 Member of Ordos Basin[J].Petrochemical Industry Application, 2017, 36(12):78-83. Google Scholar
[16]	杨维磊, 李新宇, 徐志, 等.鄂尔多斯盆地安塞地区长7段页岩油资源潜力评价[J].海洋地质前沿, 2019, 35(4):48-56. Google Scholar Yang W L, Li X Y, Xu Z, et al.Shale oil resources assessment for the member Chang 7 in Ansai area of Ordos Basin[J].Marine Geology Letters, 2019, 35(4):48-56. Google Scholar
[17]	Jiang Z, Zhang D X, Zhao J L, et al.Experimental investigation of the pore structure of triassic terrestrial shale in the Yanchang Formation, Ordos Basin, China[J].Journal of Natural Gas Science and Engineering, 2017, 46:436-450. doi: 10.1016/j.jngse.2017.08.002 CrossRef Google Scholar
[18]	徐红卫, 李贤庆, 周宝刚, 等.鄂尔多斯盆地延长探区陆相页岩气储层特征[J].煤田地质与勘探, 2017, 45(6):46-53. Google Scholar Xu H W, Li X Q, Zhou B G, et al.Characteristics of terrestrial shale gas reservoir in Yanchang exploration area of Ordos Basin[J].Coal Geology & Exploration, 2017, 45(6):46-53. Google Scholar
[19]	王羽, 金婵, 汪丽华, 等.应用氩离子抛光-扫描电镜方法研究四川九老洞组页岩微观孔隙特征[J].岩矿测试, 2015, 34(3):278-285. Google Scholar Wang Y, Jin C, Wang L H, et al.Characterization of pore structures of Jiulaodong Formation shale in the Sichuan Basin by SEM with Ar-ion milling[J].Rock and Mineral Analysis, 2015, 34(3):278-285. Google Scholar
[20]	Nie H K, Sun C X, Liu G X, et al.Dissolution pore types of the Wufeng Formation and the Longmaxi Formation in the Sichuan Basin, South China:Implications for shale gas enrichment[J].Marine and Petroleum Geology, 2019, 101:243-251. doi: 10.1016/j.marpetgeo.2018.11.042 CrossRef Google Scholar
[21]	Ma L, Dowey P J, Rutter E, et al.A novel upscaling procedure for characterising heterogeneous shale porosity from nanometer-to millimetre-scale in 3D[J].Energy, 2019, 181:1285-1297. doi: 10.1016/j.energy.2019.06.011 CrossRef Google Scholar
[22]	吴松涛, 朱如凯, 崔京钢, 等.鄂尔多斯盆地长7湖相泥页岩孔隙演化特征[J].石油勘探与开发, 2015, 42(2):167-176. Google Scholar Wu S T, Zhu R K, Cui J G, et al.Characteristics of lacustrine shale porosity evolution, Triassic Chang 7 Member, Ordos Basin, NW China[J].Petroleum Exploration and Development, 2015, 42(2):167-176. Google Scholar
[23]	Wang Y, Pu J, Wang L, et al.Characterization of typical 3D pore networks of Jiulaodong Formation shale using nano-transmission X-ray microscopy[J].Fuel, 2016, 170:84-91. doi: 10.1016/j.fuel.2015.11.086 CrossRef Google Scholar
[24]	王羽, 汪丽华, 王建强, 等.利用纳米透射X射线显微成像技术研究页岩有机孔三维结构特征[J].岩矿测试, 2017, 36(6):563-573. Google Scholar Wang Y, Wang L H, Wang J Q, et al.Investigation of organic matter pore structures of shale in three dimensions using nano-X-ray microscopy[J].Rock and Mineral Analysis, 2017, 36(6):563-573. Google Scholar
[25]	王羽, 汪丽华, 王建强, 等.基于聚焦离子束-扫描电镜方法研究页岩有机孔三维结构[J].岩矿测试, 2018, 37(3):235-243. Google Scholar Wang Y, Wang L H, Wang J Q, et al.Three-dimension characterization of organic matter pore structure of Longmaxi Shale using focused ion beam-scanning electron microscope[J].Rock and Mineral Analysis, 2018, 37(3):235-243. Google Scholar
[26]	Misch D, Mendez-Martin F, Hawranek G, et al.SEM and FIB-SEM investigations on potential gas shales in the Dniepr-Donets Basin (Ukraine): Pore space evolution in organic matter during thermal maturation[C]//IOP Conference Series: Materials Science and Engineering, 2016, 109. Google Scholar
[27]	Jiang W B, Lin M, Yi Z X, et al.Parameter determination using 3D FIB-SEM images for development of effective model of shale gas flow in nanoscale pore clusters[J].Transport in Porous Media, 2017, 117(1):5-25. doi: 10.1007/s11242-016-0817-5 CrossRef Google Scholar
[28]	靳平平, 欧成华, 马中高, 等.蒙脱石与相关黏土矿物的演变规律及其对页岩气开发的影响[J].石油物探, 2018, 57(3):344-355. Google Scholar Jin P P, Ou C H, Ma Z G, et al.Evolution of montmorillonite and its related clay minerals and their effects on shale gas development[J].Geophysical Prospecting for Petroleum, 2018, 57(3):344-355. Google Scholar
[29]	Chen R C, Xu L, Du G, et al.The dynamic micro com-puted tomography at SSRF[J].Journal of Instrumentation, 2018, 13(5):C05006. doi: 10.1088/1748-0221/13/05/C05006 CrossRef Google Scholar
[30]	Chen R C, Dreossi D, Mancini L, et al.PITRE:Software for phase-sensitive X-ray image processing and tomography reconstruction[J].Journal of Synchrotron Radiation, 2012, 19(5):836-845. doi: 10.1107/S0909049512029731 CrossRef Google Scholar
[31]	Kak A C, Slaney M, Wang G.Principles of computerized tomographic imaging[J].Medical Physics, 2002, 29(1):105-108. Google Scholar
[32]	杨超, 张金川, 李婉君, 等.辽河坳陷沙三、沙四段泥页岩微观孔隙特征及其成藏意义[J].石油与天然气地质, 2014, 35(2):286-294. Google Scholar Yang C, Zhang J C, Li W J, et al.Microscopic pore characteristics of Sha-3 and Sha-4 shale and their accumulation significance in Liaohe Depression[J].Oil & Gas Geology, 2014, 35(2):286-294. Google Scholar
[33]	解馨慧, 邓虎成, 张小菊, 等.鄂尔多斯盆地陆相页岩孔隙演化特征——以长7油层组为例[J].东北石油大学学报, 2017, 41(4):79-87. Google Scholar Xie X H, Deng H C, Zhang X J, et al.Pore evolution characteristics of continental shale reservoirs in Ordos Basin, China:A case study of the Upper Triassic Yanchang 7 Formation[J].Journal of Northeast Petroleum University, 2017, 41(4):79-87. Google Scholar
[34]	宋健, 孟旺才, 邓南涛, 等.鄂尔多斯盆地富-黄地区延长组储层特征及物性影响因素分析[J].西北地质, 2019, 52(1):98-108. Google Scholar Song J, Meng W C, Deng N T, et al.Features and influencing factors of Yanchang Formation reservoir in Fuxian-Huangling exploration area, Erdos Basin[J].Northwestern Geology, 2019, 52(1):98-108. Google Scholar
[35]	王志伟, 卢双舫, 王民, 等.湖相、海相泥页岩孔隙分形特征对比[J].岩性油气藏, 2016, 28(1):88-93. Google Scholar Wang Z W, Lu S F, Wang M, et al.Fractal characteristics of lacustrine shale and marine shale[J].Lithologic Reservoirs, 2016, 28(1):88-93. Google Scholar
[36]	赵谦平, 张丽霞, 尹锦涛, 等.含粉砂质层页岩储层孔隙结构和物性特征:以张家滩陆相页岩为例[J].吉林大学学报(地球科学版), 2018, 48(4):1018-1029. Google Scholar Zhao Q P, Zhang L X, Yin J T, et al.Pore structure and physical characteristics of shale reservoir interbedded with silty layers:An example from Zhangjiatan lacustrine shale[J].Journal of Jilin University (Earth Science Edition), 2018, 48(4):1018-1029. Google Scholar
[37]	李丽慧, 黄北秀, 李严严, 等.考虑页岩纹层与裂缝网络的延长组页岩多尺度三维地质结构模型[J].工程地质学报, 2019, 27(1):69-79. Google Scholar Li L H, Huang B X, Li Y Y, et al.Multi-scale 3D modeling of Yanchang shale geological structure considering laminas and fracture networks[J].Journal of Engineering Geology, 2019, 27(1):69-79. Google Scholar
[38]	胡文瑄, 姚素平, 陆现彩, 等.典型陆相页岩油层系成岩过程中有机质演化对储集性的影响[J].石油与天然气地质, 2019, 40(5):947-956. Google Scholar Hu W X, Yao S P, Lu X C, et al.Effects of organic matter evolution on oil reservoir property during diagenesis of typical continental shale sequences[J].Oil & Gas Geology, 2019, 40(5):947-956. Google Scholar