用生成对抗网络融合地质概率图,实现地震数据下多变量地层参数的精准反演。
Leveraging generative adversarial networks with spatially adaptive denormalization for multivariate stochastic seismic data inversion
- 结合SPADE-GAN与地质统计模拟,迭代优化地层结构与物性参数预测。
- 在2维合成与真实数据上成功预测岩相、孔隙度和声阻抗,相似系数高。
- 可融合井数据,缓解先验数据偏差,适合复杂地质建模任务。
概率地震反演常需同时预测空间相关地质非均质性(如岩相)和连续参数(如岩石与弹性属性)。生成对抗网络(GAN)提供高效训练图像驱动的模拟框架,能以较低生成成本高精度重现复杂地质模型。然而,其在多变量物性随机反演中的应用受限,因耦合多个属性需大型且不稳定的网络,带来高内存与训练开销。近期的带有空间自适应归一化(SPADE-GAN)变体可直接将岩相空间分布条件化于局部概率图。基于此,提出一种迭代地质统计反演算法SPADE-GANInv,集成预训练的SPADE-GAN与地质统计模拟,从地震数据中预测岩相及多个相关连续属性。SPADE-GAN负责生成逼真岩相几何形态,而序贯随机协同模拟则预测岩相依赖的连续属性空间变异性。每轮迭代生成一组地下实现实例,用于计算合成地震数据;与观测数据相似系数最高的实现实例用于更新下一轮的地下概率模型。该方法在2维合成场景与实际野外数据上得到验证,目标为从全叠加地震数据中预测岩相、孔隙度和声阻抗。结果表明,算法能实现准确的多变量预测,降低先验数据偏差影响,并支持额外局部约束(如井数据)。
原文摘要 · Abstract (English)
Probabilistic seismic inverse modeling often requires the prediction of both spatially correlated geological heterogeneities (e.g., facies) and continuous parameters (e.g., rock and elastic properties). Generative adversarial networks (GANs) provide an efficient training-image-based simulation framework capable of reproducing complex geological models with high accuracy and comparably low generative cost. However, their application in stochastic geophysical inversion for multivariate property prediction is limited, as representing multiple coupled properties requires large and unstable networks with high memory and training demands. A more recent variant of GANs with spatially adaptive denormalization (SPADE-GAN) enables the direct conditioning of facies spatial distributions on local probability maps. Leveraging on such features, an iterative geostatistical inversion algorithm is proposed, SPADE-GANInv, integrating a pre-trained SPADE-GAN with geostatistical simulation, for the prediction of facies and multiple correlated continuous properties from seismic data. The SPADE-GAN is trained to reproduce realistic facies geometries, while sequential stochastic co-simulation predicts the spatial variability of the facies-dependent continuous properties. At each iteration, a set of subsurface realizations is generated and used to compute synthetic seismic data. The realizations providing the highest similarity coefficient to the observed data are used to update the subsurface probability models in the next iteration. The method is demonstrated on both 2-D synthetic scenarios and field data, targeting the prediction of facies, porosity, and acoustic impedance from full-stack seismic data. Results show that the algorithm enables accurate multivariate prediction, mitigates the impact of biased prior data, and accommodates additional local conditioning such as well logs.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。