Anisotropy measurements and characterization of the Qingshankou shale  

青山口组页岩各向异性测量及其特征研究

作　　者：Li Qing-feng Yan Xue-hong Yan Wei-lin Ren Li Wang Peng Han Jian-qiang Xia Xue Chen Hao 李庆峰;闫学洪;闫伟林;任莉;王鹏;韩建强;夏雪;陈浩(大庆油田勘探事业部;中油测井大庆分公司;大庆油田勘探开发研究院;中国科学院声学研究所)

机构地区：[1]Daqing Oilfield Exploration Division,Daqing,163000,Heilongjiang,China [2]Daqing Branch Company of CNPC Logging,Daqing,163000,Heilongjiang,China [3]Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing,163712,China [4]State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Applied Geophysics》2024年第3期468-478,617,共12页应用地球物理（英文版）

基　　金：supported by Major Science and Technology Special Project of China National Petroleum Corporation"Research on Large scale Storage and Production Increase and Exploration and Development Technology of Continental Shale Oil"(2023ZZ15)。

摘　　要：Qingshankou shale(Gulong area,China)exhibits strong acoustic anisotropy characteristics,posing significant challenges to its exploration and development.In this study,the five full elastic constants and multipole response law of the Qingshankou shale were studied using experimental measurements.Analyses show that the anisotropy parametersϵandγin the study region are greater than 0.4,whereas the anisotropy parameterδis smaller,generally 0.1.Numerical simulations show that the longitudinal and transverse wave velocities of these strong anisotropic rocks vary significantly with inclination angle,and significant differences in group velocity and phase velocity are also present.Acoustic logging measures the group velocity in dipped boreholes;this differs from the phase velocity to some extent.As the dip angle increases,the longitudinal and SH wave velocities increase accordingly,while the qSV-wave velocity initially increases and then decreases,reaching its maximum value at a dip of approximately 40°.These results provide an effective guide for the correction and modeling of acoustic logging time differences in the region.古龙地区青山口页岩有较强的声学各向异性特征,从而给勘探开发带来了较大挑战。论文基于实验测量开展了青山口页岩五个弹性模量及其多极子响应规律研究。测量表明,该地区页岩纵横波各向异性参数大于0.4,而各向异性参数δ一般小于0.1,甚至是负数。此类强各向异性岩石随倾角增加,纵波和SH波速度相应增加,而qSV波速度则先增加后减小,在40°附近出现极大值,而且群速度和相速度也有较大差异。数值模拟结果表明,声波测井测量的是该方向下无限大介质的群速度,而和相速度有一定的差异。本区的正交偶极子测井资料证实了岩心测量和理论仿真结果。论文的研究成果将有效指导该地区的声波测井时差校正和建模。

关 键 词：Transverse isotropy anisotropy parameter sonic logging group velocity phase velocity 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学] TE151[石油与天然气工程—油气勘探]