Scientific projects
Contents
- Micoseismic reflection imaging of a hydraulic reservoir stimulation
- Microseismic imaging using a single geophone
- Seismic imaging using natural microearthquakes as a seismic sources
- Permeability estimation at KTB from fluid injection-induced microseismicity
- Modelling of direct and single-reflected waves for 3D layered model
- Inverse Kinematic Problem for VSP data
- Dynamic decomposition of the wavefield and reconstruction of the media
Micoseismic reflection imaging of a hydraulic reservoir stimulation
09/2010–06/2011
Application of the microseismic reflection imaging approach to the data Basel 1 geothermal reservoir stimulation. There are two separate 3D images of the waveforms from the microseismic cloud recorded at two downhole stations was constructed. The first image represents the large scale fault system 1 km east from the injection well. The second one is the high resolution image of microseismic cloud interior near the open hole interval which is consistent with the event locations and the information about fractures from the borehole.
The SS reflections image at STJ station in vertical WE section at 10470 m north (left) and complete microseismic cloud in the same scale (right). Black dots are the hypocenters of the events, black solid line – injection borehole, red solid line – borehole open section.
Microseismic imaging using a single geophone
06/2009–09/2010
Application of the microseismic reflection imaging to the data obtained from the German Continental Deep Drilling program (KTB project). This is a continuous data stream containing induced microseismicity data recorded at a single 3C geophone located at approximately 3.5 km depth. Using P and S time picks we have located 414 microseismic events using data from the borehole geophone and from near-surface stations. Since microearthquakes occur not at the same time, it is possible to separate continuous data stream recorded at the receiver to the number of 3C traces containing waveforms from different events. Using these traces I produced seismic gather for the microseismicity cloud. Using the Fresnel-Volume-Migration approach the high resolution 3D image of the seismic data between P- and S- direct waves was constructed. There was a complex network of reflectors revealed within the microseismicity cloud which belong to large scale fault zone.
Comparison of seismic attributes obtained from surface imaging results (on the background) and images from 414 microseismic events (thin curved lines). Red point – HBU geophone position, black points – microseismic cloud.
Seismic imaging using natural microearthquakes as a seismic sources
09/2007–06/2009
Development of a new passive seismic reflection imaging approach which consists of two steps. First, the hypocenter of the microseismic event is precisely located. Second, this event is treated as a "pseudo-active" seismic source and the reflections within the recorded wavefield are processed by using a directional migration algorithm in order to construct a high resolution image of the illuminated subsurface region. This approach was applied to a number of microseismic events recorded by a borehole array in the SAFOD (San-Andreas-Fault-Observatory-at-Depth) main hole. Results obtained were high-resolution 3D images of different SE-NW oriented reflectors related to the SAF system in the close vicinity of the borehole.
Vertical component of the image obtained from several microearthquakes and its correlation with lithology. Solid lines represent supposed reflectors map.
Permeability estimation at KTB from fluid injection-induced microseismicity
03/2010
Using seismicity based reservoir characterization (SBRC) approach the hydraulic permeability for three fluid injection experiment stages at KTB was estimated, at depth 4 km, 5.4k m and 9 km which is consistent with first fault zone, background rocks and second fault zone respectively. Then assuming correlation between seismic reflectivity and permeability we have constructed the permeability model from the reflectivity cube obtained by the surface seismic imaging.
Obtained permeability cube slices. Left: fault perpendicular vertical slice, right: horizontal slice at depth 3.5 km.
Modelling of direct and single-reflected waves for 3D layered model
03/2007–08/2007
Responsible for product architecture and development
Development of the program for ray-tracing based 3D modelling of the kinematical and dynamical characteristics of the direct and single reflected waves for VSP acquisition systems. The program was developed in the frame of the contract with BGP, China.
Velocity model and the result of modelled wavfield.
Inverse Kinematic Problem for VSP data
06/2004–05/2007
Responsible for product architecture and design.
Development of the method of 2D velocity model estimation using VSP travel times. The model is represented by a number of layers with smooth interfaces defined by cubic splines. Each layer is defined by the P and S velocities and its vertical gradients. The method consists of three steps: construction of the first order 1D model, construction of the model with the interfaces represented in form of the second or third order polynomial functions and construction of the model with spline boundaries and gradient velocities. The program was included into the commercial software package.
Reconstructed velocity model and wavefield with the modelled travel times.
Dynamic decomposition of the wavefield and reconstruction of the media
06/2002–09/2005
responsible for the design and implementation of the computational part.
Implementation of the interactive tool for velocity model correction, ray-tracing, and imaging of the reflected waves of different types, including multiples. The program is a part of VSP seismic processing and interpretation software UNIVERS.
Concept of simultaneous iterative processing-interpretation of seismic data. Screenshot of the software product. Left: wavefield, right: corresponding 2d model.
Contact Info
- Anton Reshetnikov→ Resume
- Email:anton@reshetnikov.com
- Phone:+49 163 365 3235
- Location:Berlin, DE
- Status:Interested in full-time opportunities