石油化工高等学校学报

石油化工高等学校学报 ›› 2017, Vol. 30 ›› Issue (5): 42-49.DOI: 10.3969/j.issn.1006-396X.2017.05.009

• 化工材料 • 上一篇    下一篇

致密砂岩长石溶蚀机制及其影响因素

吴泓辰1,2,张晓丽1,2,何金先1,2,3,任泽强1,2   

  1. (1.中国矿业大学资源与地球科学学院,江苏徐州221116;2.煤层气资源与成藏过程教育部重点实验室,江苏徐州221116;
    3.中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074)
  • 收稿日期:2017-02-28 修回日期:2017-04-05 出版日期:2017-10-31 发布日期:2017-11-10
  • 作者简介:吴泓辰(1994-),男,硕士研究生,从事油气储层地质研究工作;E-mail:hongchen00wu@foxmail.com。
  • 基金资助:
    中国博士后科学基金项目(2015M571841);构造与油气资源教育部重点实验室开放研究基金项目(TPR-2015-04); 中央高校基本科研业务费专项资金资助项目(2015QNB24)。

Dissolution Mechanism of Feldspar of Tight Sandstone and Its Influencing Factors

  1. (1.School of Resources and Geoscience, China University of Mining and Technology, Xuzhou Jiangsu 221116, China; 2.Key laboratory of Coalbed Methane Resource and Reservoir Formation Process, Ministry of Education, Xuzhou Jiangsu 221116, China; 3.Key laboratory of Tectonics and Petroleum Resources Ministry of Education, China University of Geosciences, Wuhan Hubei 430074, China)
  • Received:2017-02-28 Revised:2017-04-05 Published:2017-10-31 Online:2017-11-10

摘要: 致密砂岩储层中次生孔隙的形成以及油气的储集均与长石溶蚀作用有着密切关联。为了解决目前对致密砂岩长石溶蚀机制及其影响因素的认识薄弱问题,通过查阅大量文献,对国内外致密砂岩的长石溶蚀机制及影响因素进行了综合分析。结果表明,烃源岩生烃过程中所释放的有机酸性流体和大气淡水淋滤作用均可引起长石溶蚀。长石溶蚀属于非全等溶解,溶蚀机制可以分为表面反应溶蚀模型和淋滤层扩散溶蚀模型两种模型;热力学计算结果表明,钾长石溶蚀反应的吉布斯自由能增量(ΔG)最高,其次为钠长石,钙长石最低,且钾长石、钠长石的 ΔG 一般随温度上升而减小,而钙长石ΔG 则随温度上升而增大;长石溶蚀过程受控于长石结构与成分、温压条件、溶液pH 值及有机酸类型等多种因素。

关键词: 长石溶蚀,    ,  溶蚀机制,    ,  影响因素,    ,  致密砂岩,    , 有机酸流体,    , 大气淡水

Abstract: Feldspar Dissolution has an important influence on the development of secondary porosity of tight sandstone reservoir and the storage of oilgas. In order to solve problem of lack of recognition for dissolution mechanism of feldspar of tight sandstone and its influencing factors, through literature researches, a synthetic analysis of dissolution mechanism of feldspar and its influencing factors was made. Results show that organic acid generated from hydrocarbon source rocks and meteoric water both can dissolve feldspar. Feldspar dissolve incongruently, the surface reaction model and the leachedlayer diffusion model have been used to describe the feldspar dissolution mechanism. According to thermodynamic calculation, maximum of Gibbs free energy increment involved in Kfeldspar dissolution reaction, followed by albite, and anorthite dissolution reaction shows the minimum Gibbs free energy increment, disslution reactions of Kfeldspar and albite show negative correlation between Gibbs free energy increment and temperature, but anorthite dissolution reaction shows opposite tendency. Feldspar dissolution is controlled by its composition and structure, temperature and pressure condition, pH and acid type.

Key words: Feldspar dissolution,    ,  Dissolution mechanism,    , Influencing factors,    , Tight sandstone,    , Organic acid,    ,  Meteoric water

引用本文

吴泓辰,张晓丽,何金先,任泽强. 致密砂岩长石溶蚀机制及其影响因素[J]. 石油化工高等学校学报, 2017, 30(5): 42-49.

Wu Hongchen,Zhang Xiaoli,He Jinxian,et al. Dissolution Mechanism of Feldspar of Tight Sandstone and Its Influencing Factors[J]. Journal of Petrochemical Universities, 2017, 30(5): 42-49.

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