Borehole Seismic Services
RECON’s Borehole Seismic Division is dedicated to assisting our clients understand both reservoir and completion strategy complexities. Using state of the art equipment and technology, we provide both microseismic fracture monitoring as well as vertical seismic profiling, VSP’s. With our roots firmly in the wireline industry, we have developed not only the operational techniques to be successful, but the ability to plan, acquire, process and verify the results needed to make critical decisions such as well placement or hydraulic fracture stimulation design.
Microseismic Fracture Monitoring
RECON is helping our clients take microseismic data far beyond simple “dots in a box”. With our unique HDDtm Open Hole Logging technology we provide the closest log representation of actual rock properties. Processing this data using RECON’s best in class petrophysical and geomechanical software provides the basis for project planning and design, velocity model development and Lithometrictm completion strategy. Utilizing the Lithometrictm strategy optimizes frac stage placement and can lead to reduced horsepower costs while increasing production.
RECON uses state of the art 3C geophones and fiber optic cable for acquisition of Microseismic events during a project. We have the ability to deploy geophones in one or more observation wells simultaneously and co-locate Microseismic events from multiple observation wells in real-time.
Processing of events is performed through Applied Seismology Consultants, ASC’s, InSitetm Seismic Processer software. We provide the full spectrum of processing services. Our experienced geophysicists are specially trained in microseismic acquisition and can provide real time processing or QA/QC from the field, allowing for more responsive decision-making.
RECON is an advocate for velocity calibration. Our ability to provide our clients with a VSP for true velocity calibration and processing optimization, without the need for additional resources in the field (when using vibroseis for orientation), has further increased confidence in processed microseismic data. Furthermore, should perforation or string shots be used for orientation, RECON has developed a proprietary T0 sub, turning any orientation program into a velocity calibration opportunity.
Once the job is completed our team of geophysical specialists works quickly and efficiently to produce the information you require. In the final report we offer:
Beyond the final report, we also provide our clients with a final deliverable package:
Borehole Seismic Imaging
RECON also offers conventional borehole seismic imaging processes such as VSP’s (Incident, Walkaway, Walkaround, and 3D), AVO Analysis, Anisotropy Analysis, and full suite of borehole seismic processing.
VSP’s have proven to be the most economical way of gaining both a high resolution seismic image near wellbore, but also provide critical direct arrival information for reservoir velocity calculations. Any company contemplating a surface seismic shoot should strongly consider a VSP. RECON works with our clients to design, acquire and process a VSP, ensuring the data captured provides maximum benefit.
In addition to VSP’s, RECON also offers Amplitude vs. Offset (AVO) analysis and Anisotropy Analysis.
AVO analysis is widely used for hydrocarbon detection, lithology identification, and fluid content analysis, due to the fact that changes in seismic reflection amplitude with increasing offset can be affected by different lithology and fluid properties above and below a reflector.
Borehole seismic methods allow for improved AVO analysis over surface seismic measurement. This is due to the fact that the downhole geophones can be positioned very close to the zone of interest, resulting in the seismic energy only travelling through the unconsolidated near-surface zone once – resulting in much broader bandwidth data being measured by the geophones. Since the geophones are very close to the reflection point, they measure very accurately the downgoing wavelet, which allows a deterministic waveshaping deconvolution operator to be designed, which removes propagation effects such as attenuation and multiples. S/N is also higher due to the geophones being located in a quiet borehole environment, rather than on surface.
Critical in today’s unconventional resource development is an understanding of VTI and HTI anisotropy information. Downgoing P-wave arrival times from a walkaway VSP survey provide vertical and horizontal slowness information for many different raypaths and are used to invert for Thomsen anisotropy parameters. HTI anisotropy information can be obtained using a multi-azimuth walkaround VSP survey, which allows the computation of horizontal velocity variation with azimuth. HTI anisotropy can also be derived using other VSP geometries if shear wave splitting is occurring, by rotating the multi-component VSP data into the radial and transverse orientation and utilizing hodograms to determine the fast and slow shear directions.