当前位置: X-MOL 学术Int. J. Greenh. Gas. Con. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Compaction and mechanical strength of Middle Miocene mudstones in the Norwegian North Sea – The major seal for the Skade CO2 storage reservoir
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2017-11-05 , DOI: 10.1016/j.ijggc.2017.10.016
Mohammad Nooraiepour , Beyene Girma Haile , Helge Hellevang

This study has investigated petrophysical, acoustic and geomechanical properties of Middle Miocene mudstones in the Norwegian North Sea as the primary caprock for Skade CO2 storage reservoir. To evaluate the seal properties, we analyzed collected drill cuttings and measured well logs from well 16/4-1, in addition to an extensive well log database in the Northern North Sea. The studied caprock was identified as siliceous ooze-rich mudstones with low bulk density, high shear wave velocity, and low Vp/Vs ratio. The abundance of siliceous skeletal material resulted in a significant shift from the overall trend of mudstones within the Hordaland Group. The estimated scenarios for S-wave velocity depicted that the ooze-rich mudstones have the highest brittleness of the Hordaland Group semi-consolidated rocks. The brittleness indices in well 16/4-1 illustrated that the mineralogical composition-based indices significantly overestimate brittleness compared to the elastic-based indices. While the caprock for Skade CO2 storage reservoir showed an overall ductility, the bottom 30 m demonstrated an increased brittleness profile. The more brittle ooze-rich mudstones also indicated the lowest estimation of fracture pressure compared to other scenarios. The research outcomes emphasize on the influence of mudstone type and microstructure on the macroscale physical properties of shallow semi-compacted CO2 caprocks.



中文翻译:

挪威北海中新世中层泥岩的压实和机械强度– Skade CO 2储集层的主要海豹

这项研究调查了挪威北海中新世中层泥岩的岩石物理,声学和地质力学特性,这些岩石是Skade CO 2储集层的主要盖层。为了评估密封性,除了在北海北部建立了一个广泛的测井数据库外,我们还分析了采集的钻屑并测量了16 / 4-1井的测井记录。所研究的盖层被确定为具有低体积密度,高剪切波速度和低V p / V s的富含硅质软泥的泥岩比率。硅质骨骼物质的丰富导致了Hordaland集团内部泥岩总体趋势的重大转变。估计的S波速度情景表明,富含软泥的泥岩具有霍达兰集团半固结岩石中的最高脆性。16 / 4-1井的脆性指数说明,与基于弹性的指数相比,基于矿物成分的指数明显高估了脆性。而Skade CO 2的顶峰储层显示出整体延展性,底部30 m表现出增加的脆性分布。与其他情况相比,较软的富含软泥的泥岩也表明裂缝压力的估计值最低。研究成果强调泥岩类型和微观结构对浅半压实CO 2盖层宏观物理性质的影响。

更新日期:2017-11-05
down
wechat
bug