碳酸盐岩储集层岩溶洞穴垮塌的力学机制  

Mechanical Mechanism of Karst Cave Collapse in Carbonate Reservoirs

作　　者：张骥跃 康志宏[1] 陈华鑫 康志江[4] ZHANG Jiyue;KANG Zhihong;CHEN Huaxin;KANG Zhijiang(School of Energy Resources,China University of Geosciences,Beijing 100083,China;Sinopec Northwest Oilfield Company,Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs,Xinjiang 830011,China;Sinopec Northwest Oilfield Company,Research Institute of Exploration and Development,Urumqi,Xinjiang 830011,China;Petroleum Exploration and Production Research Institute,Sinopec,Beijing 100083,China)

机构地区：[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碳酸盐岩缝洞型油藏提高采收率重点实验室,乌鲁木齐830011 [3]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [4]中国石化石油勘探开发研究院,北京100083

出　　处：《新疆石油地质》2023年第5期618-625,共8页Xinjiang Petroleum Geology

基　　金：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)。

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。To determine the collapse mechanism of karst caves in carbonate reservoirs,through stress field simulation,and based on orthog-onal 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 col-lapse 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 pres-sure,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.

关 键 词：碳酸盐岩 储集层 岩溶洞穴 应力 垮塌 岩爆 反演 

分 类 号：TE122.2[石油与天然气工程—油气勘探]