摘要
随着油气勘探开发逐渐深入到薄层、致密层等复杂非常规储层,利用垂直井开采导致的高投入和低产出问题日益突出.为解决这一问题,水平井技术得到越来越广泛的应用.然而,水平井旁往往存在非均匀体,导致井旁地层具有明显的各向异性,从而使储层的声学属性参数测量和评价结果与实际存在显著差异,影响储层评价的精度.本研究以声传播理论为基础,制备了5块含明显非均匀层的灰岩方形岩心进行各向异性测量实验,分析了非均匀层对纵、横波速度及能量的影响,计算并探讨了声波速度与声波能量各向异性系数及内在的关联性.结果表明,5块岩心的声波速度各向异性系数在0.855~0.894范围内,声波能量各向异性系数在0.6208~0.8134范围内,揭示了岩心的明显各向异性特征,与岩心观察结果吻合;另外,每块样品的纵波与横波速度各向异性系数近似相等,且纵横波速度各向异性系数与纵横波能量各向异性系数之间存在良好的线性相关性.本研究结果可为进一步开展水平井声波测井各向异性校正方法与储层评价方法研究提供指导与参考.
As oil and gas exploration and developmentgradually penetrate into complex unconventional reservoirssuch as thin layers and tight formations,the issue of highinput and low output caused by vertical well extractionmethods becomes increasingly prominent.To address thisproblem,horizontal well technology has gained widespreadapplication.However,horizontal wells are oftensurrounded by non-uniform formations,resulting insignificant anisotropy in the formation adjacent to thewellbore.As a result,the measured acoustic properties ofthe reservoirs differ significantly from the actualconditions,impacting the accuracy of reservoir evaluation.Based on the theory of acoustic propagation,this studyprepared five square limestone cores with distinct non-uniform layers for anisotropy measurement experiments.The influence of these non-uniform layers on longitudinaland shear wave velocities and energy was analyzed.Theanisotropic relationship between acoustic velocity andenergy was calculated and explored.The results indicatethat the acoustic velocity anisotropy coefficient of the 5cores ranges from 0.855 to 0.894,and the acoustic energyanisotropy coefficient ranges from 0.6208 to 0.8134,indicating pronounced anisotropic characteristics that alignwith the observed features of the cores.Furthermore,eachsample exhibited approximately equal anisotropycoefficients of longitudinal and shear wave velocities,anda strong linear correlation was found between the anisotropycoefficient of longitudinal and shear wave velocity and theanisotropy coefficient of longitudinal and shear waveenergy.These research findings provide valuable guidanceand serve as a reference for further studies on anisotropycorrection methods and reservoir evaluation techniques in horizontal well acoustic logging.
作者
贾玲龙
伍东
武宏亮
刘鹏
章成广
蔡明
唐军
JIA LingLong;WU Dong;WU HongLiang;LIU Peng;ZHANG ChengGuang;CAI Ming;TANG Jun(Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Ministry of Education,Wuhan 430100,China;School of Geophysics and Oil Resources,Yangtze University,Wuhan 430100,China;Information Center,PetroChina Engineering Technology Research Institute Co.,Ltd.,102206,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处
《地球物理学进展》
CSCD
北大核心
2024年第3期1081-1088,共8页
Progress in Geophysics
基金
国家自然科学基金(42104126)
中国石油科技创新基金(2022DQ02-0301)
湖北省教育厅科学技术研究项目(Q20211309)联合资助。
关键词
声波
各向异性
声波能量
声波速度
水平井
Acoustic wave
Anisotropy
Acoustic wave energy
Acoustic wave velocity
Horizontal well
