Parameterization of elastic stress sensitivity in shales

referred orientation and elastic anisotropy in shales

Anisotropy in shales is becoming an important issue in exploration and reservoir geophysics. In this study, the crystallographic preferred orientation of clay platelets that contributes to elastic anisotropy was determined quantitatively by hard monochromatic X-ray synchrotron diffraction in two different shales from drillholes off the coast of Nigeria. To analyze complicated diffraction images...

Noncontacting Benchtop Measurements of the Elastic Properties of Shales

We evaluated a laser-based noncontacting method to measure the elastic anisotropy of horizontal shale cores. Whereas conventional transducer data contained an ambiguity between phase and group velocity measurements, small laser source and receiver footprints on typical core samples ensured group velocity information in our laboratory measurements. With a single dense acquisition of group veloci...

Stress Wave Propagation in Elastic-elastic and Elastic-viscoelastic Bilaminates

In the present study normal plate-impact experiments are conducted to investigate the propagation of acceleration waves in 2-D layered material systems. The objective of these experiments is to understand the role of material architecture and material inelasticity in controlling precursor decay and late-time dispersion of acceleration waves in elastic-elastic and elasticviscoelastic laminates. ...

Optimizing nano-dynamic mechanical analysis for high- resolution, elastic modulus mapping in organic-rich shales

An elastic modulus mapping technique based on spatially continuous dynamic nanoindentation is applied to map microscale variations in a fine-grained, kerogenrich shale consisting of inorganic minerals with an interpenetrating network of microscale pores filled with organic matter. Advantages and limitations of the application of this technique to shales are explored through varying sample prepa...

Effect of the local clay distribution 4 on the effective elastic properties of shales