Advanced Search
Volume 46 Issue 6
Nov.  2024
Turn off MathJax
Article Contents
Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(6): 1336-1348
QIAN Ji'an, JIANG Yuqiang, LUO Tongtong, YANG Yixiao, FU Yonghong, CHEN Weiming, SUN Chaoya, WANG Zhanlei. Microscopic pore and fracture evolution characteristics and influencing factors during imbibition process of shale reservoirs: a case study of the first section of the first member of Longmaxi Formation, western Chongqing area, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1336-1348. doi: 10.11781/sysydz2024061336
Citation: QIAN Ji'an, JIANG Yuqiang, LUO Tongtong, YANG Yixiao, FU Yonghong, CHEN Weiming, SUN Chaoya, WANG Zhanlei. Microscopic pore and fracture evolution characteristics and influencing factors during imbibition process of shale reservoirs: a case study of the first section of the first member of Longmaxi Formation, western Chongqing area, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1336-1348. doi: 10.11781/sysydz2024061336
shu

Microscopic pore and fracture evolution characteristics and influencing factors during imbibition process of shale reservoirs: a case study of the first section of the first member of Longmaxi Formation, western Chongqing area, Sichuan Basin

doi: 10.11781/sysydz2024061336
  • 1.

    School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • 2.

    Reservoir Evaluation Laboratory, Unconventional Oil and Gas Key Laboratory, CNPC, Chengdu, Sichuan 610500, China

  • 3.

    Chongqing Shale Gas Exploration and Development Co., Ltd., Chongqing 401121, China

  • 4.

    Research Institute of Shale Gas, PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610051, China

  • Received Date: 2023-12-15
  • Rev Recd Date: 2024-10-08
  • Publish Date: 2024-11-28
    Abstract
  • Hydraulic fracturing has become an important means for shale gas exploration. Understanding the evolution characteristics and influencing factors of pores and micro-fractures during the imbibition process in shale reservoirs is crucial for optimizing post-fracturing production enhancement measures. This study focuses on the black shale at the base of the first section of the first member of the Longmaxi Formation (Long 1-1 sub-member), the main production layer in the Dazu area, western Chongqing area of the Sichuan Basin. Argon ion polishing and field-emission scanning electron microscopy (FE-SEM) experiments were conducted at fixed sites to observe the evolution pattern of microscopic pores and fractures in shale reservoirs at various stages of water imbibition process. The findings revealed: (1) After water imbibition for 7 days, organic pores at the edges of organic matter exhibited varying degrees of reduction, while the internal pore shapes and sizes remained largely unchanged. (2) Intragranular dissolution pores and intergranular pores exhibited noticeable dissolution effects, resulting in mineral particle dissolution and detachment, which increased the leakage area for shale gas. (3) The water imbibition did not induce a significant amount of new micro-fractures. Instead, it extended existing micro-fractures, with the fracture width expanding by 5 to 10 times after imbibition for 14 days. (4) The surface porosity of the shale reservoir reached its peak value at day 7 of water imbibition. After 7 days, due to the continuous swelling of clay minerals, micro-fracture widths experienced varying degrees of reduction. (5) The intensity of pore and fracture expansion in shale reservoirs was primarily affected by mineral composition and pore permeability properties. Higher contents of unstable minerals and brittle minerals with larger particle sizes led to more pronounced pore expansion effects, which were conducive to post-fracturing shale gas seepage.

     

    • All authors disclose no relevant conflict of interests.
    QIAN Ji'an completed the experimental operation and the writing and revision of the paper. JIANG Yuqiang and LUO Tongtong provided experimental ideas and participated in experimental design. FU Yonghong, YANG Yixiao, and CHEN Weiming guided the experiments and participated in paper conceptualization and revision. SUN Chaoya and WANG Zhanlei participated in paper revision, data sorting, and figure drawing. All authors have read the last version of the paper and consented to its submission.
    FullText(HTML)
  • loading
    • References(37)
  • [1]
    邹才能, 赵群, 丛连铸, 等. 中国页岩气开发进展、潜力及前景[J]. 天然气工业, 2021, 41(1): 1-14.

    ZOU Caineng, ZHAO Qun, CONG Lianzhu, et al. Development progress, potential and prospect of shale gas in China[J]. Natural Gas Industry, 2021, 41(1): 1-14.
    [2]
    才能, 董大忠, 王玉满, 等. 中国页岩气特征、挑战及前景(二)[J]. 石油勘探与开发, 2016, 43(2): 166-178. doi: 10.11698/PED.2016.02.02

    ZOU Caineng, DONG Dazhong, WANG Yuman, et al. Shale gas in China: characteristics, challenges and prospects(Ⅱ)[J]. Petroleum Exploration and Development, 2016, 43(2): 166-178. doi: 10.11698/PED.2016.02.02
    [3]
    高岳, 王涛, 严子铭, 等. 页岩气高效开采中钻井完井和水力压裂的关键力学问题[J]. 力学学报, 2022, 54(8): 2248-2268.

    GAO Yue, WANG Tao, YAN Ziming, et al. Key mechanical problems of well drilling and completion and hydraulic fracture in highly efficient extraction of shale gas[J]. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(8): 2248-2268.
    [4]
    CHENG Yueming. Impact of water dynamics in fractures on the performance of hydraulically fractured wells in gas-shale reservoirs[J]. Journal of Canadian Petroleum Technology, 2012, 51(2): 143-151. doi: 10.2118/127863-PA
    [5]
    ALKOUH A. New advances in shale gas reservoir analysis using water flowback data[D]. College Station: Texas A&M University, 2014.
    [6]
    DEHGHANPOUR H, ZUBAIR H A, Chhabra A, et al. Liquid intake of organic shales[J]. Energy & Fuels, 2012, 26(9): 5750-5758.
    [7]
    廖如刚, 赵志红, 李婷, 等. 页岩储层吸水能力影响因素实验[J]. 天然气勘探与开发, 2019, 42(2): 113-117.

    LIAO Rugang, ZHAO Zhihong, LI Ting, et al. Experimental study on the factors influencing water absorption capacity of shale reservoirs[J]. Natural Gas Exploration and Development, 2019, 42(2): 113-117.
    [8]
    康治勇. 页岩浸水力学弱化及渗透性演化规律研究[D]. 重庆: 重庆大学, 2019.

    KANG Zhiyong. Research on the weakening mechanism of the soaked shale and corresponding permeability evolution[D]. Chongqing: Chongqing University, 2019.
    [9]
    林魂. 页岩气储层压后返排评估研究[D]. 北京: 中国石油大学(北京), 2017.

    LIN Hun. Research on post-frac flowback of shale gas reservoirs[D]. Beijing: China University of Petroleum (Beijing), 2017.
    [10]
    杨柳, 冷润熙, 常天全, 等. 页岩气储层渗吸与盐离子扩散相关关系[J]. 中国海上油气, 2020, 32(2): 112-119.

    YANG Liu, LENG Runxi, CHANG Tianquan, et al. Correlation between the imbibition and salt ion diffusion of shale gas reservoirs[J]. China Offshore Oil and Gas, 2020, 32(2): 112-119.
    [11]
    姜桂芹, 王国勇. 页岩气储层吸水特性及其对渗透率的影响[J]. 断块油气田, 2021, 28(4): 530-534.

    JIANG Guiqin, WANG Guoyong. Water absorption characteristics of shale gas reservoir and its influence on permeability[J]. Fault-Block Oil & Gas Field, 2021, 28(4): 530-534.
    [12]
    高书阳, 豆宁辉, 林永学, 等. 川渝地区龙马溪组页岩储层水化特征评价方法[J]. 石油钻探技术, 2018, 46(3): 20-26.

    GAO Shuyang, DOU Ninghui, LIN Yongxue, et al. A new method for evaluating the characteristics of hydration in the Longmaxi shale gas reservoir in Sichuan-Chongqing area[J]. Petroleum Drilling Techniques, 2018, 46(3): 20-26.
    [13]
    石秉忠, 夏柏如, 林永学, 等. 硬脆性泥页岩水化裂缝发展的CT成像与机理[J]. 石油学报, 2012, 33(1): 137-142. doi: 10.3969/j.issn.1001-8719.2012.01.024

    SHI Bingzhong, XIA Bairu, LIN Yongxue, et al. CT imaging and mechanism analysis of crack development by hydration in hard-brittle shale formations[J]. Acta Petrolei Sinica, 2012, 33(1): 137-142. doi: 10.3969/j.issn.1001-8719.2012.01.024
    [14]
    方朝合, 黄志龙, 葛稚新, 等. 工作液浸泡对页岩裂缝扩展及力学性质影响[J]. 太原理工大学学报, 2015, 46(4): 414-418.

    FANG Chaohe, HUANG Zhilong, GE Zhixin, et al. The influence of working fluid on fracture propagation and mechanical properties of shale[J]. Journal of Taiyuan University of Technology, 2015, 46(4): 414-418.
    [15]
    薛华庆, 周尚文, 蒋雅丽, 等. 水化作用对页岩微观结构与物性的影响[J]. 石油勘探与开发, 2018, 45(6): 1075-1081.

    Huaqing, ZHOU Shangwen, JIANG Yali, et al. Effects of hydration on the microstructure and physical properties of shale[J]. Petroleum Exploration and Development, 2018, 45(6): 1075-1081.
    [16]
    穆英, 胡志明, 端祥刚, 等. 页岩吸水对储层的作用机理研究[J]. 天然气与石油, 2020, 38(6): 73-79.

    MU Ying, HU Zhiming, DUAN Xianggang, et al. Study on shale water absorption mechanism on reservoir[J]. Natural Gas and Oil, 2020, 38(6): 73-79.
    [17]
    HERZ-THYHSEN R. J, MILLER Q R S, ROTHER G, et al. Nanoscale interfacial smoothing and dissolution during unconventional reservoir stimulation: implications for hydrocarbon mobilization and transport[J]. ACS Applied Materials and Interfaces, 2021, 13(13): 15811-15819.
    [18]
    XUE Huaqing, ZHOU Shangwen, JIANG Yali, et al. Effects of hydration on the microstructure and physical properties of shale[J]. Petroleum Exploration and Development, 2018, 45(6): 1146-1153.
    [19]
    CHAKRABORTY N, KARPYN Z T, LIU S, et al. Permeability evolution of shale during spontaneous imbibition[J]. Journal of Natural Gas Science and Engineering, 2017, 38: 590-596.
    [20]
    ZHOU Zhou, ABASS H, LI Xiaopeng, et al. Experimental investigation of the effect of imbibition on shale permeability during hydraulic fracturing[J]. Journal of Natural Gas Science and Engineering, 2016, 29: 413-430.
    [21]
    钱斌, 朱炬辉, 杨海, 等. 页岩储集层岩心水化作用实验[J]. 石油勘探与开发, 2017, 44(4): 615-621.

    QIAN Bin, ZHU Juhui, YANG Hai, et al. Experiments on shale reservoirs plugs hydration[J]. Petroleum Exploration and Development, 2017, 44(4): 615-621.
    [22]
    曾凡辉, 张蔷, 郭建春, 等. 页岩水化及水锁解除机制[J]. 石油勘探与开发, 2021, 48(3): 646-653.

    ZENG Fanhui, ZHANG Qiang, GUO Jianchun, et al. Mechanisms of shale hydration and water block removal[J]. Petroleum Exploration and Development, 2021, 48(3): 646-653.
    [23]
    曾凡辉, 张蔷, 陈斯瑜, 等. 水化作用下页岩微观孔隙结构的动态表征: 以四川盆地长宁地区龙马溪组页岩为例[J]. 天然气工业, 2020, 40(10): 66-75.

    ZENG Fanhui, ZHANG Qiang, CHEN Siyu, et al. Dynamic characterization of microscopic pore structures of shale under the effect of hydration: a case study of Longmaxi Formation shale in the Changning area of the Sichuan Basin[J]. Natural Gas Industry, 2020, 40(10): 66-75.
    [24]
    李跃纲, 周安富, 谢伟, 等. 四川盆地南部泸州地区五峰组—龙一1亚段页岩岩相划分及储层发育主控因素[J]. 天然气工业, 2022, 42(8): 112-123.

    LI Yuegang, ZHOU Anfu, XIE Wei, et al. Lithofacies division and main controlling factors of reservoir development in Wufeng Formation–Long11 sub-member shale in the Luzhou region, south Sichuan Basin[J]. Natural gas industry, 2022, 42(8): 112-123.
    [25]
    舒红林, 何方雨, 李季林, 等. 四川盆地大安区块五峰组—龙马溪组深层页岩地质特征与勘探有利区[J]. 天然气工业, 2023, 43(6): 30-43.

    SHU Honglin, HE Fangyu, LI Jilin, et al. Geological characteristics and favorable exploration areas of Wufeng Formation-Longmaxi Formation deep shale in the Da'an block, Sichuan Basin[J]. Natural Gas Industry, 2023, 43(6): 30-43.
    [26]
    王宇, 翟成, 余旭, 等. 高温作用下五峰组—龙马溪组页岩动力学特征及损伤演化规律研究[J]. 岩石力学与工程学报, 2023, 42(5): 1110-1123.

    WANG Yu, ZHAI Cheng, YU Xu, et al. Dynamic characteristics and damage evolution law of Wufeng Formation-Longmaxi Formation shale under high temperature effects[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(5): 1110-1123.
    [27]
    隋微波, 田英英, 姚晨昊. 页岩水化微观孔隙结构变化定点观测实验[J]. 石油勘探与开发, 2018, 45(5): 894-901.

    SUI Weibo, TIAN Yingying, YAO Chenhao. Investigation of microscopic pore structure variations of shale due to hydration effects through SEM fixed-point observation experiments[J]. Petroleum Exploration and Development, 2018, 45(5): 894-901.
    [28]
    丁江辉, 张金川, 杨超, 等. 页岩有机孔成因演化及影响因素探讨[J]. 西南石油大学学报(自然科学版), 2019, 41(2): 33-44.

    DING Jianghui, ZHANG Jinchuan, YANG Chao, et al. Formation evolution and influencing factors of organic pores in shale[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2019, 41(2): 33-44.
    [29]
    NIE Haikuan, ZHANG Jinchuan, JIANG Shengling. Types and characteristics of the Lower Silurian shale gas reservoirs in and around the Sichuan Basin[J]. Acta Geologica Sinica (English Edition), 2015, 89(6): 1973-1985.
    [30]
    吉利明, 吴远东, 贺聪, 等. 富有机质泥页岩高压生烃模拟与孔隙演化特征[J]. 石油学报, 2016, 37(2): 172-181.

    JI Liming, WU Yuandong, HE Cong, et al. High-pressure hydrocarbon-generation simulation and pore evolution characteristics of organic-rich mudstone and shale[J]. Acta Petrolei Sinica, 2016, 37(2): 172-181.
    [31]
    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.

    HU Wenxuan, YAO Suping, LU Xiancai, 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.
    [32]
    聂海宽, 张光荣, 李沛, 等. 页岩有机孔研究现状和展望[J]. 石油学报, 2022, 43(12): 1770-1787.

    NIE Haikuan, ZHANG Guangrong, LI Pei, et al. Research status and prospect on organic matter pores in shale[J]. Acta Petrolei Sinica, 2022, 43(12): 1770-1787.
    [33]
    WANG Qian, HOU Yucui, WU Weize, et al. The structural characteristics of kerogens in oil shale with different density grades[J]. Fuel, 2018, 219: 151-158.
    [34]
    刘磊, 姚军, 孙海, 等. 考虑微裂缝的数字岩心多点统计学构建方法[J]. 科学通报, 2018, 63(30): 3146-3157.

    LIU Lei, YAO Jun, SUN Hai, et al. Reconstruction of digital rock considering micro-fracture based on multi-point statistics[J]. Chinese Science Bulletin, 2018, 63(30): 3146-3157.
    [35]
    王东英, 姚军, 陈掌星, 等. 页岩微裂缝内气—水两相流动规律[J]. 科学通报, 2019, 64(31): 3232-3243.

    WANG Dongying, YAO Jun, CHEN Zhangxing, et al. Gas-water two-phase transport properties in shale microfractures[J]. Chinese Science Bulletin, 2019, 64(31): 3232-3243.
    [36]
    LIU Xiangjun, ZENG Wei, LIANG Lixi, et al. Experimental study on hydration damage mechanism of shale from the Longmaxi Formation in southern Sichuan Basin, China[J]. Petroleum, 2016, 2(1): 54-60.
    [37]
    郑晓卿, 刘建, 卞康, 等. 鄂西北页岩饱水软化微观机制与力学特性研究[J]. 岩土力学, 2017, 38(7): 2022-2028.

    ZHENG Xiaoqing, LIU Jian, BIAN Kang, et al. Softening micro-mechanism and mechanical properties of water-saturated shale in northwestern Hubei[J]. Rock and Soil Mechanics, 2017, 38(7): 2022-2028.
    • Relative Articles
    • Supplements(0)
    • Cited By
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Figures(12)  / Tables(1)

    Citation
    XML
    PDF-CN

    Article Metrics

    Article views (51) PDF downloads(16) Cited by()
    Proportional views
    Related

    Website Copyright © Wuxi Research Institute of Petroleum Geology, SINOPEC 苏ICP备15009037号 苏公网安备32021102000780号

    Address：No. 2060, Lihu Avenue, Wuxi, Jiangsu   (214126) Tel：0510-68787204，68787203 Fax：0510-68787113 Email：sysydz.syky@sinopec.com

    Supported by: Beijing Renhe Information Technology Co. Ltd    

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return