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| 1 | 基于角度滤波成像的最小二乘逆时偏移显示文摘在前人研究的基础上,首先分析了逆时偏移(RTM)中低频噪声的产生原因,通过波场数据得到的反射角信息构建逆散射成像条件,并与最小二乘逆时偏移(LSRTM)结合,发展了一种基于角度滤波成像的最小二乘逆时偏移方法(ALSRTM),从波动方程能量守恒方面分析了ALSRTM的可行性和保幅性。在实现算法的基础上,对SEG/EAGE二维盐丘模型的稀疏采集地震数据的成像结果表明:ALSRTM可彻底压制浅层构造的低频噪声,有效消除震源效应,在浅、中、深层均具有更好的保幅性。另外,相比常规LSRTM,ALSRTM对含有随机噪声的观测数据和含误差速度模型的适应性更强。 | 刘梦丽 黄建平 李闯 崔超 任英俊 | 2018 | 石油地球物理勘探2018,53,3: | 6 |
| 2 | Automatic fracture–vug identification and extraction from electric imaging logging data based on path morphology显示文摘We present a path morphology method to separate total rock pore space into matrix, fractures and vugs and derive their pore structure spectrum. Thus, we can achieve fine pore evaluation in fracture–vug reservoirs based on electric imaging logging data. We automatically identify and extract fracture–vug information from the electric imaging images by adopting a path morphological operator that remains flexible enough to fit rectilinear and slightly curved structures because they are independent of the structuring element shape. The Otsu method was used to extract fracture–vug information from the background noise caused by the matrix. To accommodate the differences in scale and form of the different target regions,including fracture and vug path, operators with different lengths were selected for their recognition and extraction at the corresponding scale. Polynomial and elliptic functions are used to fit the extracted fractures and vugs, respectively, and the fracture–vug parameters are deduced from the fitted edge. Finally, test examples of numerical simulation data and several measured well data have been provided for the verification of the effectiveness and adaptability of the path morphology method in the application of electric imaging logging data processing. This also provides algorithm support for the fine evaluation of fracture–vug reservoirs. | Xi-Ning Li Jin-Song Shen Wu-Yang Yang Zhen-Ling Li | 2019 | Petroleum Science2019,16,1: | 5 |
| 3 | 融合地震属性和成像测井信息优化的储层缝洞带评价与钻井轨迹显示文摘针对新疆某工区强非均质性岩溶缝洞型碳酸盐岩储层,提出了一种基于地震多属性优化与电成像测井信息融合的碳酸盐岩储层缝洞带识别评价与钻井轨迹优化设计方法。首先,利用相干体、蚂蚁体等多种地震属性与张量约束的稀疏脉冲反演结果综合实现缝洞发育带空间分布预测与雕刻,确定可能油气圈闭的分布范围;然后,基于数学形态学滤波方法,由电成像测井资料自动拾取井壁的裂缝和溶蚀孔洞分布,统计井壁裂缝倾向和倾角;再次,用工区内钻孔多臂井径资料计算的井筒崩落信息与电成像资料拾取的诱导缝信息预测工区的最大和最小主应力方向;最后,融合地震属性与电成像测井信息评价的缝洞分布结果,预测工区内走滑断裂带的最大主应力方向以NE—SW为主,局部为NW—SE,且以中高角度为主的裂缝走向与主应力近乎平行。采用预测主应力分布方法实现了沿NW—SE方向的大斜度井与水平井优化设计,钻遇了大规模优质储集体,获得了稳定油流,并以此为基础在周围打井若干口,极大地降低了深层勘探的钻井风险。 | 王磊 沈金松 邹榕 蔺学敏 徐忠祥 苏朝阳 杨萍 | 2021 | 吉林大学学报(地球科学版)2021,51,2: | 4 |
| 4 | 基于混合随机共轭梯度的最小二乘逆时偏移显示文摘针对最小二乘逆时偏移计算效率低的问题,基于随机最优化思想推导了混合随机共轭梯度算法,发展了基于混合随机共轭梯度的最小二乘逆时偏移方法。为了减小偏移数据量,提出了基于数据相关性的炮数据采样方法,减弱了梯度的随机性。对炮数据采样后,结合随机梯度和共轭梯度对成像结果进行更新,通过共轭梯度提高了收敛效率及成像质量。对SEG/EAGE起伏地表模型和M工区实际资料的成像测试结果表明,该方法能提高传统最小二乘偏移的计算效率,相对于随机梯度下降算法具有更高成像质量和更快收敛速度。 | 李闯 黄建平 李振春 王蓉蓉 孙苗苗 | 2018 | 石油地球物理勘探2018,53,6: | 4 |
| 5 | Huber inversion-based reverse-time migration with de-primary imaging condition and curvelet-domain sparse constraint显示文摘Least-squares reverse-time migration(LSRTM) formulates reverse-time migration(RTM) in the leastsquares inversion framework to obtain the optimal reflectivity image. It can generate images with more accurate amplitudes, higher resolution, and fewer artifacts than RTM. However, three problems still exist:(1) inversion can be dominated by strong events in the residual;(2) low-wavenumber artifacts in the gradient affect convergence speed and imaging results;(3) high-wavenumber noise is also amplified as iteration increases. To solve these three problems, we have improved LSRTM: firstly, we use Hubernorm as the objective function to emphasize the weak reflectors during the inversion;secondly, we adapt the de-primary imaging condition to remove the low-wavenumber artifacts above strong reflectors as well as the false high-wavenumber reflectors in the gradient;thirdly, we apply the L1-norm sparse constraint in the curvelet-domain as the regularization term to suppress the high-wavenumber migration noise. As the new inversion objective function contains the non-smooth L1-norm, we use a modified iterative soft thresholding(IST) method to update along the Polak-Ribie re conjugate-gradient direction by using a preconditioned non-linear conjugate-gradient(PNCG) method. The numerical examples,especially the Sigsbee2 A model, demonstrate that the Huber inversion-based RTM can generate highquality images by mitigating migration artifacts and improving the contribution of weak reflection events. | Bo Wu Gang Yao Jing-Jie Cao Di Wu Xiang Li Neng-Chao Liu | 2022 | Petroleum Science2022,19,4: | 2 |
| 6 | 预条件弹性介质最小二乘逆时偏移显示文摘相对于纵波勘探,多波地震勘探能够得到更多的地下介质信息,弹性波逆时偏移(Elastic reverse time migration,ERTM)是当前偏移方法中较为精确的方法。最小二乘逆时偏移成像基于反演理论,可为岩性储层评价提供更加保真的高分辨率反射系数成像剖面,成为当前成像方法的研究热点和发展趋势。从建立线性一阶速度-应力弹性波方程出发,应用伴随状态法得到了逆时偏移数据重构算法,并引入最小二乘理论,利用汉森矩阵的逆对梯度进行预处理,实现了预条件弹性介质最小二乘逆时偏移成像算法(Preconditioning elastic least-squares reverse time migration,P-ELSRTM)。在实现算法的基础上,对SEG/EAGE二维盐丘模型进行测试。结果表明:与常规弹性波最小二乘逆时偏移(Elastic leastsquares reverse time migration,ELSRTM)相比,P-ELSRTM成像分辨率更高,保幅性更好,收敛速度更快。另外,P-ELSRTM对含有随机噪音的观测数据适应性更强。 | 刘梦丽 徐兴荣 王小卫 胡书华 刘金涛 | 2020 | 岩性油气藏2020,32,5: | 1 |
| 7 | 基于循环对抗神经网络的快速最小二乘逆时偏移成像方法显示文摘最小二乘逆时偏移成像方法因计算量巨大,限制了其大规模的工业应用。基于此,建立循环对抗神经网络表征Hessian矩阵的逆,构建逆时偏移结果和反射系数之间的映射关系。通过建立的神经网络对逆时偏移成像结果进行去模糊化处理,提高成像质量,同时大幅减少计算时间。将训练好的网络应用于Marmousi模型和Sigsbee2A模型的逆时偏移结果。结果表明,本文方法在不显著增加计算量的情况下较好地提高了逆时偏移成像质量。 | 黄韵博 黄建平 李振春 刘博文 | 2023 | 中国石油大学学报(自然科学版)2023,47,3: | 0 |
| 8 | 面向地质目标的地震偏移成像进展显示文摘面向地质目标体的成像技术将局部区域作为成像目标,获得深层目标构造或特殊地质构造如高陡构造、盐下构造、小尺度构造的精细成像结果。总结了面向地质目标的地震偏移成像方法的研究进展,归纳出面向地质目标体的成像方法包括了数据选择类方法和模型选择类方法。数据选择类方法利用地震特征波对特殊地质构造进行成像,主要包括多次波成像、绕射波成像和回折波成像等;模型选择类方法对局部目标区域进行精确成像,通常可大幅度提高计算效率,主要包括基于模型选择的地震干涉法、数据基准面重构法、面向地质目标的CFP成像方法、局部目标成像法、声弹耦合波场延拓法和成像域最小二乘偏移法等。面向地质目标的地震偏移成像技术总体发展趋势是从偏移成像到反演成像,模型选择类方法与数据选择类方法融合发展,并与人工智能技术结合,可实现地质目标地震靶向成像。 | 曲英铭 李振春 | 2023 | 石油物探2023,62,5: | 0 |