arXiv:2409.11541eess.IV2024-09被引 4

用物理约束的生成对抗网络,从井数据生成高精度三维岩心模型。

Using Physics Informed Generative Adversarial Networks to Model 3D porous media

  • 通过渐进高斯变形调节生成对抗网络,将井场数据融入三维岩心生成过程。
  • 生成的模型能精确复现孔隙度、渗透率和孔径分布等关键岩石属性。
  • 适合需要连接微观结构与宏观油藏数据的研究者,提升油藏模拟可信度。

岩石的微CT扫描显著提升了我们对多孔介质孔隙尺度物理的理解。随着孔隙尺度模拟方法(如孔隙网络模型)的发展,现已可从CT扫描的岩心样本中准确模拟多相流特性,包括相对渗透率。然而,受限于实际扫描样本数量以及孔隙尺度网络与油田尺度岩性参数之间的关联难题,孔隙尺度模拟结果难以直接用于真实油田规模的储层模拟。深度学习生成合成三维岩心结构的方法,能够模拟不同岩心结构的变化,进而计算代表性岩石属性和流动函数。但当前多数3D岩心结构生成的深度学习方法未考虑来自井观测的岩石属性,缺乏微观结构与宏观数据之间的直接联系。本文提出一种基于生成对抗网络(GAN)的方法,通过渐进高斯变形实现条件约束,构建受井场观测数据驱动的三维岩心结构。首先预训练一个Wasserstein GAN以重建3D岩心结构;随后利用孔隙网络模型模拟器计算岩石属性;再通过高斯变形逐步调整生成的潜在向量,生成符合井场数据约束的三维岩心结构。该方法实现了高分辨率合成图像生成,并能重现用户定义的岩石属性,如孔隙度、渗透率和孔径分布。本研究为连接GAN生成模型与场域衍生量提供了新途径。

原文摘要 · Abstract (English)

Micro-CT scanning of rocks significantly enhances our understanding of pore-scale physics in porous media. With advancements in pore-scale simulation methods, such as pore network models, it is now possible to accurately simulate multiphase flow properties, including relative permeability, from CT-scanned rock samples. However, the limited number of CT-scanned samples and the challenge of connecting pore-scale networks to field-scale rock properties often make it difficult to use pore-scale simulated properties in realistic field-scale reservoir simulations. Deep learning approaches to create synthetic 3D rock structures allow us to simulate variations in CT rock structures, which can then be used to compute representative rock properties and flow functions. However, most current deep learning methods for 3D rock structure synthesis don't consider rock properties derived from well observations, lacking a direct link between pore-scale structures and field-scale data. We present a method to construct 3D rock structures constrained to observed rock properties using generative adversarial networks (GANs) with conditioning accomplished through a gradual Gaussian deformation process. We begin by pre-training a Wasserstein GAN to reconstruct 3D rock structures. Subsequently, we use a pore network model simulator to compute rock properties. The latent vectors for image generation in GAN are progressively altered using the Gaussian deformation approach to produce 3D rock structures constrained by well-derived conditioning data. This GAN and Gaussian deformation approach enables high-resolution synthetic image generation and reproduces user-defined rock properties such as porosity, permeability, and pore size distribution. Our research provides a novel way to link GAN-generated models to field-derived quantities.

生成模型岩心建模物理约束渗流模拟

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