西安石油大学学报（自然科学版）2024，Vol.39Issue(5)：35-42,8.DOI:10.3969/j.issn.1673-064X.2024.05.005
岩心力学实验刻度弹性参数的页岩脆性评价方法改进
Improvement of Shale Brittleness Evaluation Methods Based on Calibration of Elastic Parameters by Rock Core Mechanics Experiments
摘要
Abstract
The key to the scale utilization of shale reservoirs lies in the formation of fracturesby hydraulic fracturing.The geological fac-tors that form complex fracture network depend on the natural fractures,horizontal stress difference and brittleness of shale reservoirs.High brittleness is one of the necessary conditions to form fracture network by fracturing.Aiming at the problem of unclear weight coeffi-cients of Young's modulus and Poisson's ratio in existing methods for evaluating the brittleness index of elastic parameters,a brittleness evaluation index based on stress-strain curve is proposed based on triaxial mechanical testing of rock cores and analysis of whole rock samples.Through statistical intersection analysis,the sensitivity of Young's modulus and Poisson's ratio to rock brittleness was clarified.Based on the correlation coefficients between brittleness evaluation indicator and Young's modulus and Poisson's ratio,the weight coeffi-cients of Young's modulus and Poisson's ratio were further determined using an equal proportion method,improving the existing evalua-tion methods for elastic parameter brittleness index.The application examples of shale formations in the eastern basin show that com-pared with existing evaluation methods,the elastic parameter brittleness evaluation method calibrated by core mechanics experiments is more reasonable and effective,and can better reflect the distribution characteristics of shale reservoir brittleness.关键词
页岩脆性评价/力学测试/弹性参数/杨氏模量/泊松比Key words
shale brittleness evaluation/mechanical test/elastic parameter/Young's modulus/Poisson's ratio分类
能源科技引用本文复制引用
王团,赵海波,郑建东,乔卫,唐晓花,田得光..岩心力学实验刻度弹性参数的页岩脆性评价方法改进[J].西安石油大学学报（自然科学版）,2024,39(5):35-42,8.基金项目
中国石油天然气股份公司攻关性应用性重大科技专项"陆相页岩油规模增储上产与勘探开发技术研究"(2023ZZ15) （2023ZZ15）
中央引导地方科技发展专项"黑龙江省致密油和泥岩油成藏研究重点实验室建设项目"(ZY20B13) （ZY20B13）
