Seismogenic process of fluid injection revealed by in situ dynamic CT scanning

In the process of unconventional energy exploitation, large volumes of fluid are injected into low permeability reservoirs for hydraulic transformation to generate a fracture network conducive to fluid migration. Unfortunately, extensive fluid injection can induce earthquakes, endangering human lives and causing serious economic losses. Understanding the seismogenic process of fluid injection within a reservoir helps to minimize the induced earthquakes. To better monitor the deformation changes in reservoirs, we conducted in situ dynamic X-ray computed tomography (CT) during a series of experiments lasting 3 minutes for real-time identification of the location and geometry of hydraulic fractures and found that the seismogenic process of fluid injection with a wide range of frequencies is triggered by water–rock interactions. The data we uploaded can be divided into two main parts. The first part is the confining, axial and water injection pressures recorded during the hydraulic fracturing experiment. The second part is the CT scans of the rock sample during the hydraulic fracturing experiment.在非常规能源开发过程中，为生成利于流体运移的裂缝网络，通常会向低渗储层注入大量流体以开展水力改造作业。但遗憾的是，大规模流体注入可能诱发地震，威胁人类生命安全并造成严重经济损失。明确储层内流体注入的发震过程，有助于降低诱发地震的影响。为更好地监测储层变形变化，我们在一系列持续3分钟的实验中开展了原位动态X射线计算机断层扫描（CT），以实时识别水力裂缝的位置与形态，并发现宽频域流体注入的发震过程由水岩相互作用触发。本次上传的数据集可分为两个主要部分：第一部分为水力压裂实验过程中记录的围压、轴压以及注水压力数据；第二部分为水力压裂实验过程中岩样的CT扫描数据。