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Stepwise inversion method for determining anisotropy parameters in a horizontal transversely isotropic formation

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Applied Geophysics 2019年第2期16卷 233-242,254-255页

作者： Song Yun-Hong Chen Hao wang xiu-ming State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing100190China. University of Chinese Academy of Sciences Beijing100049China. Beijing Engineering Research Center of Sea Deep Drilling and Exploration Institute of AcousticsChinese Academy of SciencesBeijing100190China.

The anisotropy of a geologic formation can reflect the direction of fractures and ground stress, which is an important metric that guides the exploration and development of oil and gas reservoirs. Cross-dipole acoustic logging is the main method used to detect anisotropy with borehole geophysics. In this paper, a stepwise inversion method for three anisotropy parameters in a horizontal transversely isotropic(HTI) formation is proposed, which turns one 3D operation of simultaneous inversion into three 1D operations. The scheme’s stability and reliability were tested by numerically simulated data using a f inite-difference method, and by f ield logging data. The inversion results of the simulated data show that the stepwise inversion method can stably obtain the fast shear azimuth and the anisotropy parameters in both fast and slow formations with strong and weak anisotropy, and it performed well even with noisy data. In particular, the results of the fast shear azimuth inversion were very stable and reliable. The inversion results of f ield logging data were consistent with those given by existing commercial software, which used simultaneous inversion, for both fast and slow formations. Where large difference was observed between our stepwise method and the commercial software, our analysis suggests that the fast shear azimuth of our inversion was more reasonable, which reinforces its superior performance and practicality.

关键词： cross-dipole anisotropy stepwise inversion

用于固体矿床多分量感应测井响应模拟的矢量有限元法

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地球物理学报 2016年第1期59卷 355-367页

作者：王健陈浩王秀明中国科学院声学研究所声场与声信息国家重点实验室北京100190 中国科学院大学北京100049

本文开发了基于非结构化四面体网格的三维矢量有限元法,实现了固体矿床井眼中多分量感应测井响应的数值模拟,并分析了多分量感应测井仪器在复杂矿床模型中的响应特征.本文通过采用几何因子背景场,有效地避免了源的奇异性问题;同时,在井... 详细信息

本文开发了基于非结构化四面体网格的三维矢量有限元法,实现了固体矿床井眼中多分量感应测井响应的数值模拟,并分析了多分量感应测井仪器在复杂矿床模型中的响应特征.本文通过采用几何因子背景场,有效地避免了源的奇异性问题;同时,在井眼边界采用非均质网格并用Gauss-Legendre积分计算四面体单元的等效电导率.利用LU分解求解线性方程组,实现了一次网格划分多点的数值计算,提高了计算效率,从而实现快速连续的多分量感应测井模拟.非结构化的四面体网格确保了该方法可以模拟实际问题中所能遇到的复杂的矿体模型.基于水平三层分层和径向分层模型,验证了算法在各向同性和各向异性介质中的可靠性.我们还以三个不同的矿床模型为例,研究了多分量感应测井仪的不同分量的探测特性,结果表明,结合九个分量的信息,可以探测矿体的深度,也可以识别矿体的方位和走向,为精确地描述矿体的三维分布特征打下了基础.

关键词：矢量有限元多分量感应测井固体矿床

Delineation of bed boundaries of array induction logging curves using deep learning

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Applied Geophysics 2021年第1期18卷 45-53,129页

作者： Zhang Lei wang Jian Jiao RuiLi Hao Chen wang xiu-ming Ji You-ming State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China Beijing Information Science&Technology University Beijing 100192China University of Chinese Academy of Sciences Beijing 100049China Beijing Engineering Research Center of Sea Deep Drilling and Exploration Beijing 100190China

Delineation of bed boundaries based on resistivity logging curves is important prior information for the inversion and interpretation of resistivity logging ***,the layering algorithm mainly use the derivatives of resistivity curves or other logging methods as ***,measurement error or resolution mismatch may lead to misjudgment of the *** view of the shortcomings of traditional methods,this paper presents an automatic layering algorithm of array induction logging curves based on deep *** this algorithm,a locally connected convolution neural network is used,and the generalization ability of the network is improved by enlarging the training set,optimizing the window length and threshold,and strengthening the layering *** and field data show the eff ectiveness of the proposed algorithm.

关键词： Deep learning array induction logging layering algorithm

Acoustic field simulations of logging while drilling by cylindrical finite difference with variable grids

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Applied Geophysics 2022年第1期19卷 11-28,143页

作者： Pan Yue He Xiao Chen Hao wang xiu-ming State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing100049China Beijing Engineering Research Center of Sea Deep Drilling and Exploration Beijing 100190China

This study proposes an elastic finite difference(FD)time domain method with variable grids in three-dimensional cylindrical *** calculations will diverge and become less accurate by conventional cylindrical FD as the grid size gradually becomes more extensive with the increasing *** prevent grids from being too coarse in far fields,we compensate for the grid cell infl ation by refi ning the grid step in the azimuthal *** variable grid FD in the cylindrical coordinate systems has a higher effi ciency in solving acoustic logging while drilling(LWD)problems because the grid boundaries are consistent with those of the drill collar and the *** proposed algorithm saves approximately 94%of the FD grids,80%of the computation time,and memory with a higher calculation accuracy than the FD on rectangular grids for the same *** also calculate the acoustic LWD responses of the fl uid-fi lled borehole intersecting with *** ections are generated at the fractures,which can be equivalent to an additional scattering *** mode conversions between the collar and the Stoneley waves are *** Stoneley spectra are more sensitive to the ***,the logs in a heterogeneous formation with two refl ectors far from the borehole are modeled,and a means of estimating the azimuth of geological interfaces from refl ections is proposed.

关键词： acoustic detection finite difference variable grid method scattering and refl ection cylindrical guided wave

孔隙内填充单一固体的固-固孔隙介质中的声波传播

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物理学报 2022年第9期71卷 374-385页

作者：刘琳张秀梅王秀明中国科学院声学研究所声场声信息国家重点实验室北京100190 中国科学院大学北京100149 中国科学院声学研究所北京市海洋深部钻探研究中心北京100190

连通孔隙空间被有别于骨架固体的另一种固相介质充填而形成的双组分连通固体孔隙介质,简称固-固孔隙介质.推导出了固-固孔隙介质的声波动力学方程和本构关系,利用平面波分析的方法研究了各种波的频散和衰减特性.在此基础上,提出了基于... 详细信息

连通孔隙空间被有别于骨架固体的另一种固相介质充填而形成的双组分连通固体孔隙介质,简称固-固孔隙介质.推导出了固-固孔隙介质的声波动力学方程和本构关系,利用平面波分析的方法研究了各种波的频散和衰减特性.在此基础上,提出了基于一阶速度-应力方程的时间分裂的高阶交错网格有限差分算法,对其中的声场演化特点进行了模拟计算,分析了各种波的产生机制和能量分布,并详细讨论了两种固体间的摩擦系数和声源频率对各种波传播特性的影响.数值模拟表明:固-固孔隙介质中存在两种纵波(P1和P2)和两种横波(S1和S2),其中P1和S1波能量主要在骨架固体中传播;P2和S2波是骨架固体和孔隙固体之间相对运动产生的慢波,能量主要在孔隙固体中传播.固体骨架和孔隙固体之间的摩擦主要影响慢波(P2和S2)的衰减,且低频时衰减大于高频.

关键词：孔隙介质声学时间分裂的交错网格有限差分平面波分析传播特性

Rough interfaces and ultrasonic imaging logging behind casing

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Applied Geophysics 2016年第4期13卷 683-688,739页

作者： Tao Bei Chen De-Hua He Xiao wang xiu-ming Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China

Ultrasonic leaky Lamb waves are sensitive to defects and debonding in multilayer media. In this study, we use the finite-difference method to simulate the response of flexural waves in the presence of defects owing to casing corrosion and rough fluctuations at the cement-formation interface. The ultrasonic obliquely incidence could effectively stimulate the flexural waves. The defects owing to casing corrosion change the amplitude of the early- arrival flexural wave, which gradually decrease with increasing defect thickness on the exterior walls and is the lowest when the defect length and wavelength were comparable. The scattering at the defects decreases the energy of flexural waves in the casing that leaks directly to fluids. For rough cement-formation interface, the early-arrival flexural waves do not change, whereas the late-arrival flexural waves have reduced amplitude owing to the scattering at rough interface.

关键词： Leaky flexural waves finite difference numerical simulation rough interface cementing quality

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基于偶极弯曲波频散的横波慢度径向分布反演

地球物理学报 2013年第6期56卷 2077-2087页

作者：马明明陈浩何晓王秀明声场声信息国家重点实验室中国科学院声学研究所北京100190

本文针对地层横波慢度径向分层模型,分析了地层横波慢度的径向非均匀性对弯曲波频散的影响.基于径向非均匀与均匀模型之间弯曲波频散的差异,结合微扰法和Backus-Gilbert(BG)理论建立了反演横波慢度径向分布的方程,求取了地层横波慢度的... 详细信息

本文针对地层横波慢度径向分层模型,分析了地层横波慢度的径向非均匀性对弯曲波频散的影响.基于径向非均匀与均匀模型之间弯曲波频散的差异,结合微扰法和Backus-Gilbert(BG)理论建立了反演横波慢度径向分布的方程,求取了地层横波慢度的径向分布.在无噪声和参数误差时,反演结果较好地反映了实际地层横波慢度的径向分布,当井孔流体或井外地层纵波慢度的选取误差在10%内变化时,反演结果基本保持不变;存在信噪比(SNR)为20dB(信号的功率为噪声的100倍)或10dB(信号的功率为噪声的10倍)噪声时,反演结果没有发生明显的改变,其相对误差基本控制在10%以内,可见噪声对反演结果的影响不大.以上反演结果说明,本文采用的结合微扰法和BG理论的反演方法来估测地层横波慢度的径向分布时,具有很好的鲁棒性,可以被用于现场了解井壁周围的地层性质.

关键词：径向分层弯曲波频散微扰法 Backus-Gilbert理论

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有限元感应测井模拟的背景场选择方法研究

地球物理学报 2015年第6期58卷 2177-2187页

作者：王健陈浩王秀明张雷中国科学院声学研究所声场与声信息国家重点实验室北京100190 中国科学院大学北京100049

在感应测井的有限元模拟中,为了消除源的奇异性,一般将总场分解为背景场和散射场.本文定量研究了不同背景场选择方法对计算精度的影响.首先,分析了在均匀和径向分层介质中不同背景电导率对长短源距线圈系有限元模拟结果的影响;其次,利... 详细信息

在感应测井的有限元模拟中,为了消除源的奇异性,一般将总场分解为背景场和散射场.本文定量研究了不同背景场选择方法对计算精度的影响.首先,分析了在均匀和径向分层介质中不同背景电导率对长短源距线圈系有限元模拟结果的影响;其次,利用三层介质模型对比了选择源点附近和线圈系中点附近地层电导率作为背景电导率的结果.研究结果表明,如果在选择背景场时,只考虑源附近的散射场梯度而不同时考虑源和接收器附近的散射场梯度,计算误差明显增大.在此基础上提出一种利用Gianzero几何因子计算的视电导率作为背景电导率的新的背景场方法.该方法综合考虑了围岩、井眼、线圈距等因素,特别是在介质分界面处,可有效减小计算误差,并取得了满意的精度.本研究为复杂环境下的感应测井模拟的背景场选择提供了指导和依据.

关键词：数值模拟感应测井有限元背景场几何因子

非均匀饱含黏性流体孔隙介质中声波传播及井孔声场分析

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物理学报 2023年第5期72卷 29-41页

作者：彭凡张秀梅刘琳王秀明中国科学院声学研究所声场声信息国家重点实验室北京100190 中国科学院大学北京100049 中国科学院声学研究所北京市海洋深部钻探研究中心北京100190

声波在饱含流体孔隙介质中的传播特性与流体的黏滞性及孔隙介质的非均匀性密切相关.本文在Biot理论基础上,考虑了孔隙流体的剪切应力及孔隙结构的非均匀性,采用含黏性流体孔隙介质中的波动理论,研究了孔隙介质中四种体波的频散和衰减特... 详细信息

声波在饱含流体孔隙介质中的传播特性与流体的黏滞性及孔隙介质的非均匀性密切相关.本文在Biot理论基础上,考虑了孔隙流体的剪切应力及孔隙结构的非均匀性,采用含黏性流体孔隙介质中的波动理论,研究了孔隙介质中四种体波的频散和衰减特性,分析了慢横波对快纵波转换散射的影响,进一步推导了孔隙地层井孔中的模式波及其声场的解析解,研究了非均匀孔隙介质中井孔模式波和波列的特征.研究结果表明,含黏性流体孔隙介质中存在慢横波,慢横波的频散很强,其传播特征受到介质孔隙度、渗透率及孔隙流体黏度的影响.在非均匀孔隙介质中,与慢横波相关的剪切应力平衡过程不仅导致快纵波的频散和衰减,还会影响井孔伪瑞利波及斯通利波的传播特征.本文的工作完善了孔隙介质中声波传播的物理机制,为孔隙地层井孔声波的解释与应用提供了理论指导.

关键词：慢横波非均匀孔隙介质黏性流体井孔声波

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