Inversion of induced reservoir pore-pressure changes from deformation measurements may provide a potentially powerful reservoir-monitoring tool if the issues of measurement noise, uncertainty in model parameterization, and numerical accuracy and stability can be resolved. We discuss inverting injection-induced reservoir pressure changes from observable surface deformations using a linear poroelastostatic model of a subsurface reservoir. ...display full article text

Monitoring of cyclic steam stimulation by inversion of surface tilt measurements

Another one of my upcoming SEG 2017 talks in Houston.

Multiscale time-domain time-lapse full-waveform inversion with a model-difference regularization (full article PDF)

My upcoming talk at SEG 2017 in Houston.

Time-domain broadband phase-only full-waveform inversion with implicit shaping (full article PDF)

Check out extended abstract of the talk given at the First EAGE Workshop on Practical Reservoir Monitoring, 6-9 March 2017, Amsterdam, The Netherlands. Fluid movement in the subsurface and the associated changes in saturation translate into changes of the subsurface elastic parameters. Stress changes, whether due to fluid extraction/injection or deformation such as slips on preexisting faults, affect the elastic parameters as well. Detecting and inverting the imprint of changing subsurface elastic parameters on seismic data lies at the heart of time-lapse seismic imaging for reservoir monitoring. In this work we demonstrate that the recently proposed technique of simultaneous time-lapse full-waveform inversion with a model-difference regularization can be used to extract high-resolution information on magnitude and location of subsurface velocity and stress anomalies, potentially providing valuable input for reservoir monitoring and assessment of geohazards.

Amsterdam 2017 Extended Abstract

My recent Geophysics paper that presents a systematic development of "Time-lapse Inverse Theory". The proposed theory and derived computational techniques provide a framework for stable and accurate resolution of model changes in the presence of measurement noise and repeatability issues, even for inaccurate baseline inversions. While primary application of the proposed method is 4D seismic analysis, the underlying theory and mathematical apparatus of multi-scale inversion allows for a wide range of generalizations for applications in Natural Sciences and Engineering....display full article text

Time-lapse Inverse Theory with Applications (full paper in PDF)