Case Studies and Feasibility Studies

This case study is based on an industrial data set provided by one of our sponsors. We demonstrate the possibility of processing and interpreting hydraulic fracturing induced microseismicity with a low signal/noise ratio obtained from a restricted acquisition geometry. We provide work-flows for microseismic event localization as well as for determining fracture geometry and estimating hydraulic transport properties.

Distribution of critical pore pressures computed from sonic well logs. Spatial distribution (left) and histogram of computed critical pore pressures.

Geophysical Understanding of Microseismicity

Geo-mechanical Modeling of Fracture Strength Distribution in Elastically Heterogeneous Rocks Acoustic Emission in Sandstone Samples: Pore Pressure Pulses and Kaiser effect Microseismic Back Front Signatures for Nonlinear Fluid-Rock Interaction

Imaging the San Andreas Fault

We aim to image subsurface geologic structures across the San Andreas fault system in South Central California. Old industry seismic reflection data are reprocessed and imaged with advanced prestack migration techniques in order to produce new seismic images down to the lower crust.

Microseismic Imaging Result

Microseismic Imaging and Event Analysis

Distribution of the Vp/Vs Ratio within the Basel 1 Geothermal Reservoir from Microseismic Data Microseismic Reflection Imaging of Stimulated Reservoirs and Fracture Zones Multiplet Based Extraction of Geological Structures Reflections at a Thin Fluid Layer Representing a Hydraulic Fracture The Influence of Anisotropy on the Location of Microseismic Events Microseismic Source Characterization

Inter event volume analysis: Fraction of IEV falling in log spaced intervals.

Physics and Interpretation of Fluid Induced Seismicity

Bounds of Magnitude Probability for Seismicity Induced by Stimulations of Reservoirs Characterisation of the Seismotectonic State of Reservoir Locations Using the Magnitude Distribution of Earthquakes Inter Event Times of Fluid Induced Earthquakes Suggest their Poisson Nature