多种地震属性预测致密砂岩河道——以西加盆地Deep basin地区为例

A Case Study of Multi-seismic Attributes Prediction for Tight Sand Channels in Deep Basin Area,West-Canadian Basin

为了准确描述西加盆地致密砂岩储层的河道展布,以西加盆地Deep basin油田的致密砂岩储层为例,通过对晚白垩世Dunvegan致密砂岩储层在地震上的异常特征分析,总结出了致密砂岩河道的展布特征。利用地震相干分析技术确定了河道边界为北东向展布,宽度范围为2～3km;利用频谱分解技术预测出了河道主体的砂体发育,结合测井相、沉积相资料确定相对较好储层为河道上倾方向,即工区中东部地区,钻井验证东北部河道区获初产油256bbl/d。以上成果认识为钻探部署、经济开发提供了地质依据。

To precisely depict the tight sand channels of West- Canadian basin,we exemplified the tight sand in Deep basin area,West-Canadian basin,analyzed the anomalous characteristics of the late Cretaceous Dunvegan sandstone reservoir and the distribution of the channel was sharply carved.Seismic analysis coherence was applied to determine that the channels is NE distributed and the maximum channel extent is 2~3 km.Spectral decomposition was used to predict the main channel body,thus logging and sedimentary facies data were integrated to calculate the thickness of the main channel sand.With integration of logging and sedimentary facies,the updip direction was proved to be the most prospective area,meaning the mid-east area.Results demonstrate that NE part of the channel initially produced 256 bbl/d.The paper consolidates geologic evidence to the subsequent drilling and economic development.