基于四维动态地质力学的碳酸盐岩储气库承压能力分析
Analysis of the Pressure-Bearing Capacity of Carbonate Reservoirs for Gas Storage Based on Four-Dimensional Dynamic Geomechanics
席增强 1贾善坡 2王秀伟 1张品金 2毕扬扬 1张博1
作者信息
- 1. 中国石油华北油田分公司勘探开发研究院,河北任丘 062552
- 2. 东北石油大学环渤海能源研究院,河北秦皇岛 066004
- 折叠
摘要
盖层动态密封性和断层动态密封性是储气库的主要评价指标,对储气库的安全运行具有重要意义.针对储气库盖层与断层静态评价体系的不足,以国内华北地区某碳酸盐岩型储气库为背景,结合测井资料开展岩石力学实验,建立岩石力学动静态参数转换模型和储气库四维地质力学模型,反演地质体初始应力场,开展储气库地质体承压能力分析,获得储气库在注采条件下的四维动态应力场信息(三维应力场在时间维度下的信息).四维地质力学计算结果表明,当前上限压力(47 MPa)下盖层及断层破坏风险较低,当储气库上限压力提高到49 MPa时,盖层及断层仍然没有发生破坏,结合地面压缩机运行能力,确定储气库上限运行压力为49 MPa.四维动态应力场的建立为储气库的提压扩容提供了科学理论依据.
Abstract
The dynamic sealing performances of the caprock and fault are important evaluation indicators of underground gas storage(UGS)and are of great significance to the safe operation of the UGS.In view of the shortcomings of the static evaluation system of cap-rocks and faults for the UGS,this paper takes a carbonate gas storage in North China as an example,performs rock mechanical experi-ments based on well logs,and establishes the dynamic-static conversion model for rock mechanics parameters and a four-dimensional geomechanical UGS model.Based on the developed models,the initial stress field of the UGS geological body is inverted,the pressure-bearing capacity of the UGS geological body is analyzed,and the four-dimensional dynamic stress field information under the UGS in-jection and production conditions are obtained.Four-dimensional geomechanical calculation results show that the risk of caprock and fault failure is low under the current upper limit pressure(47 MPa).The caprock and faults will not fail even if the upper limit pressure of the UGS is increased to 49 MPa.As per this combined with the operating capacity of the surface compressor,the upper limit operat-ing pressure of the UGS is determined to be 49 MPa.The establishment of the four-dimensional dynamic stress field provides a scientif-ic basis for the further pressurization and capacity expansion of the UGS.
关键词
储气库/地质力学/承压能力/上限压力/盖层密封性/断层密封性Key words
underground gas storage/geomechanics/pressure-bearing capacity/upper limit pressure/caprock sealing performance/fault sealing performance引用本文复制引用
基金项目
国家自然科学基金(42072166)
黑龙江省自然科学基金(LH2020D004)
出版年
2024
NETL
NSTL
万方数据