多波地震深度学习的油气储层分布预测案例

摘要

有机并有效利用纵波与转换横波在油气储层敏感度上存在的差异,有助于突出地震油气储层特征,有助于提高地震油气储层分布边界刻画的精度.基于此,本文设计了一种卷积神经网络与支持向量机方法相结合的多波地震油气储层分布预测的深度学习法(Deep Learning Method).首先,利用莱特准则剔除所生成的多波地震属性中可能存在的异常值降低网络变体数量.然后,通过能突出多波地震油气储层特征的聚类算法和无监督学习算法构建隐藏层,用于增加网络共享,提取油气特征.最后,将增加网络罚值后的井点样本作为支持向量机预测的输入样本,以降采样后的C3卷积层属性作为学习集,进行从已知到未知的地震油气储层的预测.本方案应用于HG地区晚三叠统HGR组的碳酸盐岩油气储层预测,所预测的地震油气储层边界更加清晰,预测结果与实际情况基本吻合.应用结果表明:本论文方案不仅具有可行性,且具有有效性.%The accuracy of forecasted characteristics and distribution of hydrocarbon reservoirs is a key in quantitative interpretation of seismic data,which can be improved by analyzing the sensitivity difference of compressive P and converted PS waves in seismic properties of reservoirs.Based on this consideration,this work proposed a deep learning method to predict the distribution and teatures of hydrocarbon reservoirs with a combination of a convolution neural network and a support vector machine.All possible outliers of multi-component seismic attributes,which might reduce the number of variants in the network,are eliminated firstly in accordance with the Wright criterion.Second,using the verified clustering and unsupervised algorithms,the hidden layer is constructed to enhance network sharing and extract hydrocarbon features.Finally,with the network penalized well-log data as the input of the support vector machine,the C3 convolution layer attributes after downsampling are adopted as the learning set to predict the desired hydrocarbon characteristics.This novel method has been applied to predict carbonate rock reservoirs of late Triassic in XGR Formation of the HG structure in an oil filed,resulting in enhanced resolution and improved lateral distribution of hydrocarbon reservoirs which coincides roughly with the real drilling data.The feasibility and effectiveness of this approach is corroborated by the application.