地质通报2026，Vol.45Issue(2)：463-480,18.DOI:10.12097/gbc.2024.04.012
砂泥互层复合岩体力学特征、裂缝发育演化规律及其对超深油气勘探开发的指导意义
Mechanical characteristics,fracture development and evolution laws of sand-mud interbedded composite rock mass,and guiding significance for ultra-deep hydrocarbon exploration and development
摘要
Abstract
[Objective]Unclear mechanical properties and fracture development laws of sand-mud interbedded rock masses in ultra-deep clastic reservoirs limit fracture prediction accuracy and pose challenges to reservoir research and drilling-completion engineering.[Methods]This study focuses on the Cretaceous reservoir rocks in the Kuqa Depression.Rock compression experiments were conducted by manually making sand mud interbedded rock samples,and combined with discrete element numerical simulation,the mechanical characteristics and crack development evolution laws of sand mud interbedded composite rock masses were analyzed from the aspects of loading curve,particle deformation,stress chain changes,and crack propagation.[Results]The results show that:(1)the crack propagation mode during rock compression failure is mainly compression shear cracks,accounting for more than 70%;(2)the strength of rocks with a single lithology is high,while the strength of interlayered composite rocks is lower than that of rocks with a single lithology.The strength of sand mud interlayered rocks may even be lower than that of pure mudstone;(3)The failure of composite materials with sand and mud interlayers mainly occurs in mudstone with lower strength,while sandstone with higher strength often maintains good integrity;(4)the strength and fracture mode of interlayered rock masses are jointly influenced by the mineral composition of the rock and the thickness of the rock layers(interlayered ratio).When the sand and mud thickness(ratio)is close,the strength of the rock mass is low and the failure is most significant.[Conclusions]The research results can provide support for reservoir prediction,wellbore trajectory optimization,and wellbore stability analysis in oil and gas exploration and development.关键词
岩石力学/砂泥互层/裂缝发育/应力/超深油气Key words
rock mechanics/sandstone mudstone interlayers/fracture development/stress/ultra-deep hydrocarbon分类
天文与地球科学引用本文复制引用
来姝君,徐珂,张志镇,张辉,尹国庆,王志民,王海应..砂泥互层复合岩体力学特征、裂缝发育演化规律及其对超深油气勘探开发的指导意义[J].地质通报,2026,45(2):463-480,18.基金项目
中国石油天然气股份有限公司重大科技专项《超深层油气藏开发关键技术研究与应用》(编号:2023ZZ14-03)和塔里木油田公司研发中心科技项目《勘探地质力学技术研究与应用》(编号:YF202505) Support by Major Science and Technology Special Project of PetroChina Company Limited(No.2023ZZ14-03)and Science and Technology Project of R&D Center of Tarim Oilfield Company(No.YF202505) （编号:2023ZZ14-03）
