Effects of mineralogical composition on uniaxial compressive strengths of sedimentary rocks  

作　　者：Zhen-Liang Chen Huai-Zhong Shi Chao Xiong Wen-Hao He Hai-Zhu Wang Bin Wang Nikita Dubinya Kai-Qi Ge 

机构地区：[1]Beijing Key Laboratory of Optical Detection Technology for Oil and Gas,China University of Petroleum-Beijing,Beijing,102249,China [2]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum-Beijing,Beijing,102249,China [3]Basic Research Center for Energy Interdisciplinary,College of Science,China University of Petroleum,Beijing,102249,China [4]Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences,123242,Moscow,Russia [5]Science and Technology Center of Geophysics and Mineral Resources,Moscow Institute of Physics and Technology,141701,Dolgoprudny,Russia [6]Shale Gas Exploration and Development Project Manager Department,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan,610051,China

出　　处：《Petroleum Science》2023年第5期3062-3073,共12页石油科学（英文版）

基　　金：supported by National Key Research and Development Program of China(2019YFA0708302);National Natural Science Foundation of China(Grant No.52004296,and Grant No.52274016);the Foundation of State Key Laboratory of Petroleum Resources and Prospecting(PRP/DX-2206);Science Foundation of China University of Petroleum-Beijing(No.2462022YXZZ007,No.2462022BJRC012).

摘　　要：Figuring out rock strength plays essential roles in the sub ground mining activities,such as oil and gas well drilling and hydraulic fracturing,coal mining,tunneling,and other civil engineering scenarios.To help understand the effects of the mineralogical composition on evaluating the rock strength,this research tries to establish indirect prediction models of rock strength by specific input mineral contents for common sedimentary rocks.Using rock samples collected from the outcrops in the Sichuan Basin,uniaxial compression tests have been conducted to sandstone,carbonate,and shale cores.Combining with statistical analysis,the experimental data prove it true that the mineralogical composition can be utilized to predict the rock strength under specific conditions but the effects of mineralogical composition on the rock strength highly depend on the rock lithologies.According to the statistical analysis results,the predicted values of rock strengths by the mineral contents can get high accuracies in sandstone and carbonate rocks while no evidences can be found in shale rocks.The best indicator for predicting rock strength should be the quartz content for the sandstone rocks and the dolomite content for the carbonate rocks.Especially,to improve the evaluation accuracy,the rock strengths of sandstones can be obtained by substituting the mineral contents of quartz and clays,and those of carbonates can be calculated by the mineral contents of dolomite and calcite.Noticeably,the research data point out a significant contrast of quartz content in evaluating the rock strength of the sandstone rocks and the carbonate rocks.Increasing quartz content helps increase the sandstone strength but decrease the carbonate strength.As for shale rocks,no relationship exists between the rock strength and the mineralogical composition(e.g.,the clay fractions).To provide more evidences,detailed discussion also provides the readers more glances into the framework of the rock matrix,which can be further studied in the future.These findings

关 键 词：Uniaxial compressive strength Quartz content CLAY SANDSTONE CARBONATE SHALE 

分 类 号：P618.13[天文地球—矿床学]