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AI 破局岩心缺损!Stable Diffusion 精准修复储层岩心缺失段

AI 破局岩心缺损!Stable Diffusion 精准修复储层岩心缺失段

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https://pmc.ncbi.nlm.nih.gov/articles/PMC12546600/pdf/41598_2025_Article_20817.pdf

计算机视觉研究院专栏

Column of Computer Vision Institute

岩心是解锁地下油气储层的 “金钥匙”,能直接呈现岩性、沉积构造等核心地质信息。但取心破损、搬运损耗、实验室取样打孔,总会让岩心出现缺失段,给储层建模带来巨大误差。

传统修复方法要么精度不足,要么依赖人工干预,直到Stable Diffusion(稳定扩散模型)的出现,让岩心缺失段智能修复迎来新突破。

PART/1

岩心缺损:困扰储层评价的行业痛点   

岩心数据是储层表征的核心依据,但其缺失问题始终难以避免:

  • 脆性页岩、裂缝性碳酸盐岩取心易发生机械破损;
  • 松散砂岩在洗井区易流失,脆弱岩心搬运易损坏;
  • 实验室英寸级岩塞取样,直接破坏沉积构造连续性。

早期图像修复技术(扩散偏微分方程、补丁匹配)仅适配小范围缺损,面对复杂纹理、大缺失区直接 “失效”;后续 CNN、GAN 虽提升精度,但超 50% 缺失区、复杂地质特征仍难以搞定。扩散模型的崛起,成为解决这一难题的关键。

【扩散模型图像修复发展历程图】

PART/2

Stable Diffusion:岩心修复的 AI 核心方案   

本次研究采用Stable Diffusion Model(SDM),基于潜空间压缩 + U-Net 架构,专为岩心图像修复优化,是行业内的创新尝试。

1. 模型核心原理

扩散模型训练分两大阶段:

  • 正向加噪
    :给完整图像逐步添加高斯噪声,最终变为纯噪声,让模型学习图像退化规律;
  • 反向去噪
    :迭代去除噪声,还原原始图像,实现缺损内容生成。

SDM 通过预训练自编码器将图像压缩至潜空间运算,大幅提升效率,同时保留地质细节。

2. 修复专属改造

为岩心修复优化 U-Net 输入,新增掩码通道:白色标记岩心缺失区、黑色保留原始岩心区域,让模型精准定位修复范围。

3. 六步标准化修复流程

  1. 岩心图像裁剪拼接,形成连续全井段图像;
  2. 滑动窗口提取重叠图像块,适配模型输入;
  3. 随机掩码模拟岩心缺损,构建训练样本;
  4. 逐步加噪,完成模型扩散过程训练;
  5. 迭代去噪,固定原始区域、生成缺损区域;
  6. 模型部署,实现真实岩心缺失段修复。

4. 实验数据支撑

采用 130 + 张公开岩心箱图像,覆盖 10 口井、多样沉积环境,拆分 10000 + 高分辨率补丁(80% 训练 / 20% 验证),在 NVIDIA RTX3070 显卡上完成训练。

【Stable Diffusion 模型架构图】

PART/3

实验    

实测效果:四类场景修复表现拉满

研究针对四种典型岩心缺损场景测试,结合视觉评估 + LPIPS 量化指标(LPIPS<0.35 即视觉连贯、地质合理),修复效果远超传统方法:

  1. 英寸级岩塞修复精准还原毫米级沉积构造、层理完整性,不同岩性均保持纹理一致,无明显修复痕迹。

    【英寸岩塞修复对比图】

  2. 均质地层修复完美保留岩相特征、生物扰动结构,LPIPS 值低至 0.24,地质一致性拉满。

    【均质地层修复对比图】

  3. 渐变相带修复成功复刻粒度渐变、生物扰动强度变化,层理趋势无偏差,适配生物扰动序列等渐变场景。

    【渐变相带修复对比图】

  4. 复杂非均质地层(挑战项)可还原整体岩性与沉积趋势,但突变岩性边界、断裂末端缺失时,精准度明显下降。

    【插入原文图 8、图 9:复杂非均质地层修复对比图】

PART/4

价值   

    技术边界:优势与局限清晰明确

    ✅ 核心优势

    1.缺损大小是关键:小缺损修复精度远胜大缺损,掩码大小比形状更影响效果,小圆形掩码修复最优;
    2.适配场景明确:均质区、渐变相带修复精度拉满,沉积纹理、层理架构还原度高;
    3.降本增效:无需大量人工干预,降低人为解释偏差,提升储层评价效率。

    ❌ 现存局限

    1.无法精准定位突变岩相边界、无末端的断裂结构;
    2.图像分辨率因补丁尺寸妥协,细节略有模糊;
    3.测井数据因尺度差(1.25m 测井间距 vs 50cm 内岩心缺损),无法提供有效地质约束。
    【不同掩码形状 / 大小修复对比图】

    PART/5

    总结   

    本次研究证实,Stable Diffusion 可高效修复岩心缺失段,有效降低储层评价不确定性,为油气地质研究提供全新 AI 工具。未来结合高分辨率地质约束的混合模型,将进一步突破复杂地质场景限制,让 AI 成为地下储层研究的硬核帮手。

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    1. CONNECT:[ UseTime:0.001015s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001587s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000695s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000612s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001247s ]
    6. SELECT * FROM `set` [ RunTime:0.000502s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001387s ]
    8. SELECT * FROM `article` WHERE `id` = 755546 LIMIT 1 [ RunTime:0.000911s ]
    9. UPDATE `article` SET `lasttime` = 1781657933 WHERE `id` = 755546 [ RunTime:0.044318s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000825s ]
    11. SELECT * FROM `article` WHERE `id` < 755546 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001584s ]
    12. SELECT * FROM `article` WHERE `id` > 755546 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001198s ]
    13. SELECT * FROM `article` WHERE `id` < 755546 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002422s ]
    14. SELECT * FROM `article` WHERE `id` < 755546 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001560s ]
    15. SELECT * FROM `article` WHERE `id` < 755546 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001817s ]
    0.233544s