Geomechanical properties of Groningen Reservoir, Netherlands, from deformation and seismicity.

从格罗宁根大型气田开采天然气面临着巨大的地面工程挑战。随着储集层的压实和上覆区域的下沉，诱发地震活动正在增加。这是一个人口稠密的地区，因此具有重大的社会意义和兴趣。天然气开采记录将与卫星InSAR产生的形变、水库上方的GPS测量以及使用新的59个地震仪阵列在井中记录的微震活动的信息结合在一起。将对数据集进行分析，以限制粘性和孔弹性变形的贡献，以及地震和非地震变形的划分。这将使我们能够对地下储集层的地质力学特性进行建模，对诱发地震活动的可能大小和位置施加基于物理的约束，并更好地了解地震事件中弹性能量是如何积累和释放的。

Extraction of gas from the large Groningen field presents significant ground engineering challenges. As the reservoir compacts and the overlying region subsides induced seismicity is increasing. This is a densely populated area so the societal importance and interest is significant.The gas extraction record will be combined with information on deformation derived from satellite InSAR, GPS measurements above the reservoir, and microseismicity recorded using a new array of 59 seismometers in boreholes. The dataset will be analysed to constrain the contribution of viscous and poro-elastic deformation and the partitioning of seismic and aseismic deformation. This will allow us to model the geomechanical properties of the subsurface reservoir, place physics-based constraints on the likely size and location of induced seismicity, and better understand how elastic energy builds up and is released in seismic events.