학술논문
富有机质页岩的岩石力学性质及其影响因素研究进展 / Geomechanical properties and influencing factors of organic-rich shale
Document Type
Academic Journal
Author
张瑶珈; 陈志鹏; 于春勇; 董峰; 屈凯旋; 施宝海; ZHANG Yaojia; CHEN Zhipeng; YU Chunyong; DONG Feng; QU Kaixuan; SHI Baohai
Source
录井工程 / LUJING GONGCHENG. 34(4):104-111
Subject
Language
Chinese
ISSN
1672-9803
Abstract
岩石力学性质是井筒稳定性评价和水力压裂设计的重要参数,富有机质页岩的岩石力学性质及其影响因素一直是页岩油气领域关注的焦点.岩石力学性质的表征方法多种多样且适应性各不相同,加之复杂的地质条件对页岩岩石力学性质存在不同程度的影响,因此正确评价页岩的岩石力学性质具有重要意义.在简述富有机质页岩力学评价中常用参数及其含义的基础上,综述了页岩岩石力学性质的主要影响因素,并讨论了不同影响因素的适用性和局限性,结果表明:(1)弹性、强度和脆性是页岩岩石力学评价的重要参数,不同应用场合对评价参数各有侧重;(2)富有机质页岩的岩石力学性质受岩石内在因素以及原位埋藏环境的影响,尤以受矿物组分、有机质、含水率、围压、温度、层理、天然裂缝、各向异性的影响最为显著,在优选页岩油气开发甜点时应首先明确影响岩石力学性质的主控因素.最后对岩石力学性质在富有机质页岩开发中的应用及未来发展进行了展望,认为解决页岩的力学问题是推动4000 m以深页岩油气开发的关键,开展基于岩石力学性质的页岩分类研究有助于统一评价标准,数值模拟和机器学习等技术将为富有机质页岩的岩石力学性质表征发挥更重要的作用.
Geomechanical properties play a crucial role in both evaluating wellbore stability and stimulating hydraulic fracturing.The geomechanical properties of organic-rich shale and its influencing factors have always been a central focus in the field of shale oil and gas.There are multiple ways to characterize the properties of rocks with different indications.Furthermore,the complex geological conditions significantly influence the geomechanical properties of shale.Therefore,correctly evaluating the geomechanical properties of shale is of great practical significance.This paper reviews the main influencing factors of shale mechanical properties,and discusses the applicability and limitations of different influencing factors on the basis of briefly describing the common parameters and their indications in the geomechanical evaluation of organic-rich shale.The results indicate that:(1)Elasticity,strength,and brittleness are important parameters for the geomechanical evaluation of shale,and different evaluation parameters are applicable to different scenarios.(2)The geomechanical properties of organic-rich shale are affected by both internal factors of the rock and the in-situ burial environment.Among these factors,mineral components,organic matter abundance,water content,confining pressure,temperature,bedding,natural fractures,and anisotropy are the most significant.It is essential to identify the main controlling factors affecting geomechanical properties to select sweet spots for shale oil and gas development.(3)In terms of application and future development,solving the mechanical problems of shale is the key to promote the development of shale deeper than 4000 meters.Conducting shale classification research based on geomechanical properties will help unify the evaluation standards.Numerical simulation and machine learning will play increasingly important roles in characterizing the geomechanical properties of organic-rich shale.
Geomechanical properties play a crucial role in both evaluating wellbore stability and stimulating hydraulic fracturing.The geomechanical properties of organic-rich shale and its influencing factors have always been a central focus in the field of shale oil and gas.There are multiple ways to characterize the properties of rocks with different indications.Furthermore,the complex geological conditions significantly influence the geomechanical properties of shale.Therefore,correctly evaluating the geomechanical properties of shale is of great practical significance.This paper reviews the main influencing factors of shale mechanical properties,and discusses the applicability and limitations of different influencing factors on the basis of briefly describing the common parameters and their indications in the geomechanical evaluation of organic-rich shale.The results indicate that:(1)Elasticity,strength,and brittleness are important parameters for the geomechanical evaluation of shale,and different evaluation parameters are applicable to different scenarios.(2)The geomechanical properties of organic-rich shale are affected by both internal factors of the rock and the in-situ burial environment.Among these factors,mineral components,organic matter abundance,water content,confining pressure,temperature,bedding,natural fractures,and anisotropy are the most significant.It is essential to identify the main controlling factors affecting geomechanical properties to select sweet spots for shale oil and gas development.(3)In terms of application and future development,solving the mechanical problems of shale is the key to promote the development of shale deeper than 4000 meters.Conducting shale classification research based on geomechanical properties will help unify the evaluation standards.Numerical simulation and machine learning will play increasingly important roles in characterizing the geomechanical properties of organic-rich shale.