冀北凤山盆地白垩系九佛堂组页岩气成藏潜力研究

Study on Cretaceous Jiufotang Formation Shale Gas Reservoiring Potential in Fengshan Basin,Northern Hebei

基于以往钻井资料和相关测试数据,结合野外调查,初步分析探讨认为凤山盆地为一倾向北西的单斜构造,白垩系九佛堂组页岩层系总厚度大,上部频繁交替的致密泥质岩可作为良好的盖层,为形成页岩气藏提供了物质基础和保存条件,具备一定的页岩气成藏潜力。同时,周边地区中生代断陷盆地沉积环境多与凤山盆地类似,白垩系富有机质页岩沉积厚度大,且在已有油页岩钻孔有涌气显示,分析可将该页岩层系作为页岩气勘查突破的新方向。

On the basis of previous drilling data and related testing results, combined with field investigation, the initial analysis and discussion have considered that the Fengshan Basin is a monocline dipping northwest, with large total thickness of Cretaceous Jiufotang Formation shale measures. The upper part frequently alternating compact argillaceous rock can play as a favorable capping and provided material basis along with preservation condition for the formation of shale gas reservoir and caused it to have certain shale gas reservoiring potential. Meanwhile, sedimentary environment of peripheral Mesozoic fault basins are mostly similar to Fengshan Basin, sedimentary thickness of Cretaceous organic matter rich shale is large. Some available oil shale boreholes have indication of gas inrush, thus the shale measures can be the breakthrough orientation of shale gas prospecting.