Because microfractures in shale are diminutive features (10’s nm to cm), they are challenging to observe using traditional laboratory-based imaging systems and are often overlooked. Likewise, tight organic and inorganic matrix is difficult to image with conventional methods and interpret. Consequently, diverse imaging platforms, measurements, and image reconstruction algorithms are needed. Scientific advances in the ability to image fractures and fluid flow in shale will create unparalleled insights into the nature and properties of fractured shale. We shall acquire and analyze new microscopic 2D and 3D x-ray based computed tomographic images of source rocks to quantify percolating microcrack features within shale and integrate measurements as follows. The efforts in this characterization theme are key to establishing a common model of shale.
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(a) (b) Example of multiscale imaging to reveal details of shale fabric (Vega et al. 2015). (a) Overlay of X-ray CT image (200 mm x 200 mm resolution) on high resolution SEM (75X). Colors on CT image indicate the Krypton-filled porosity. (b) SEM mosaic from region C. Arrows point to microfractures and a large number of calcite nodules (medium gray color) are visible in the lower portion of the image . Comparing (a) and (b) shows that gas resides throughout the calcite filled region in the lower portion of the image. |
