新疆石油地质 ›› 2023, Vol. 44 ›› Issue (5): 618-625.doi: 10.7657/XJPG20230515

• 应用技术 • 上一篇    下一篇

碳酸盐岩储集层岩溶洞穴垮塌的力学机制

张骥跃1(), 康志宏1(), 陈华鑫2, 康志江3   

  1. 1.中国地质大学(北京) 能源学院,北京 100083
    2.中国石化 西北油田分公司 a.碳酸盐岩缝洞型油藏提高采收率重点实验室;b.勘探开发研究院,乌鲁木齐 830011
    3.中国石化 石油勘探开发研究院,北京 100083
  • 收稿日期:2022-06-08 修回日期:2023-03-21 出版日期:2023-10-01 发布日期:2023-09-25
  • 通讯作者: 康志宏(1966-),男,辽宁北镇人,教授,油气田开发地质,(Tel)13439822020 (E-mail)kangzh98@cugb.edu.cn
  • 作者简介:张骥跃(2002-),男,江苏无锡人,本科在读,油气田开发地质,(Tel)13914125339(E-mail)zjywxmbfrzx@163.com
  • 基金资助:
    国家自然科学基金企业创新发展联合基金(U19B6003);中国石化科技部课题(P21063-1)

Mechanical Mechanism of Karst Cave Collapse in Carbonate Reservoirs

ZHANG Jiyue1(), KANG Zhihong1(), CHEN Huaxin2, KANG Zhijiang3   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China
    2. Sinopec Northwest Oilfield Company, a.Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs; b.Research Institute of Exploration and Development, Urumqi, Xinjiang 830011, China
    3. Petroleum Exploration and Production Research Institute, Sinopec, Beijing 100083, China
  • Received:2022-06-08 Revised:2023-03-21 Online:2023-10-01 Published:2023-09-25

摘要:

为确定碳酸盐岩储集层岩溶洞穴的垮塌机理,利用应力场模拟技术,以岩溶洞穴正交二维剖面为基础,建立二维力学模型,模拟碳酸盐岩岩溶洞穴在负压状态下的应力分布;通过对控制变量进行多元线性回归,构建了岩溶洞穴垮塌预测模型,结合破裂临界点的应力函数,预测洞穴垮塌与应力、深度和宽度的关系。洞穴发生岩爆和垮塌的最主要影响因素是上覆地层压力、储集层抗压强度和抗弯强度。垂向分布的2个洞穴,垂直距离小于0.3倍洞穴半径时,洞穴隔板发生破裂,导致洞穴连通;在垮塌破裂过程中,洞穴高度变化较为明显,宽度变化较小。

关键词: 碳酸盐岩, 储集层, 岩溶洞穴, 应力, 垮塌, 岩爆, 反演

Abstract:

To determine the collapse mechanism of karst caves in carbonate reservoirs, through stress field simulation, and based on orthogonal two-dimensional sections of the karst caves, a two-dimensional mechanical model was established to simulate the stress distribution characteristics of the carbonate karst caves under negative pressure. By multiple linear regression on controlling variables, a karst cave collapse model coupling with the stress function of the critical fracture point was constructed to predict the relationships among cave collapse and stress, depth and width. It is found that the most important factors influencing cave rock burst and collapse are overlying formation pressure, reservoir compressive strength and flexural strength. For two caves superimposed vertically, when their vertical distance is less than 0.3 times the cave radius, the partition between the two caves breaks, leading to the cave connection. During the collapse and rupture, the cave height changes obviously, while the width changes slightly.

Key words: carbonate, reservoir, karst cave, stress, collapse, rockburst, inversion

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