简介：常规地震勘探大多基于反射波理论,对尺度小、倾角陡、构造复杂的灾害性地质体,很难得到精确的成像结果。本文建立2类典型矿井地质模型,采用有限差分正演模拟算法,研究了矿井地震散射波的特征,将等效偏移距偏移（EOM）和基于等效偏移距干涉叠加偏移的散射成像方法用于矿井地震勘探中,重点分析了散射波成像相比常规反射波地震成像的技术优势。研究表明：1）散射成像方法能够提高覆盖次数,充分利用有效的弱散射信号,对不均匀复杂地质体的散射波的成像效果明显优于反射波叠后偏移;2）对于巷道超前探测,它弥补了基于射线理论的叠加偏移的不足,为提高矿井地震勘探分辨率提供了有效的成像方法。

简介：电磁全息测量数据包含两种模态，因此重建流动图像也需采用“双模”融合的敏感场。首先，通过电磁全息探测物理场分析，结合层析成像数学理论Radon反变换，从定解问题推导了全息测量敏感场函数表达式。其次，将有限元仿真计算得到的全息测量敏感场应用于模拟流动试验和全息成像。结果表明，基于复电位φ关于极径r的偏导数的全息测量敏感场契合了Radon反变换的数学表达，且充分体现了幅度、相位测量敏感性；反演所得流动图像更加吻合实际流型。全息测量敏感场构建有效克服了传统单模敏感场在计算精度和计算效率等方面的局限性。

简介：Inthispaper,wetheoreticallyandnumericallystudyacombinedmonopole–dipolemeasurementmodetoshowitscapabilitytoovercometheissuesencounteredinconventionalsingle-wellimaging,i.e.,thelowsignal-to-noiseratioofthereflectionsandazimuthambiguity.First,theazimuthambiguity,whichexistsextensivelyinconventionalsingle-wellimaging,issolvedwithanimprovedimagingprocedureusingcombinedmonopole–dipoleloggingdatainadditiontoconventionalloggingdata.Furthermore,wedemonstratethatthedirectwavespropagatingalongtheboreholeswithstrongenergy,canbeeffectivelyeliminatedwiththeproposedcombinedmonopole–dipolemeasurementmode.Thereflectionsarethereforepredominantinthecombinedmonopole–dipoledataevenbeforethesignalsarefiltered;thus,thereflections’arrivaltimesineachreceiverareidentified,whichmayhelpminimizethedifficultiesinfilteringconventionalloggingdata.Theoptimizedprocessingflowofthecombinedmeasurementmodeloggingimageisgiveninthispaper.Theproposedcombinedmonopole–dipolemeasurementmodemayimprovetheaccuracyofsingle-wellimaging.