Presurvey Design and Acquisition
Iterative workflow to optimize 3D VSP surveys
Integrate survey design, 3D synthetic data generation, and imaging.
The VSI imager’s downhole sensor package measures the particle motion of the formation at the wellbore with proprietary three-axis omnitilt geophone accelerometers (GACs) with a flat response in the borehole seismic band and tight manufacturing tolerances.
The sensor package’s positive anchoring, small size, and acoustic isolation provide effective immunity from tool harmonics and tube wave noise in the borehole seismic band. Digitization close to the sensor package helps to reduce signal distortion for superior clarity and interpretation.
These design features help avoid the problems typically encountered with conventional borehole seismic tools and deliver the highest vector fidelity demonstrated by any borehole seismic tool in the industry.
The QVSI imager made it possible to obtain a vertical seismic profile (VSP) for an entire well drilled offshore West Africa. A conventional tool was run in the 17½-in open hole but wasn’t qualified to log farther into the HT section. The QVSI imager easily returned high-quality images in the final 6-in openhole section and behind both casing strings.
Analysis of borehole seismic data collected during the exploration or appraisal process provides accurate velocity, position, and anisotropy information for analyzing, enhancing, and calibrating surface seismic data.
Our multidisciplinary interpretation experts work with you as needed to extend the resulting high-resolution reservoir description away from the wellbore to locate reservoir sweet spots, fractures, and compartments. Fast-track borehole seismic images are particularly useful for designing sidetrack or horizontal wellbores.
An additional application is microseismic interpretation with real-time monitoring to improve fracturing results and lead to better well production. Cross-well seismic data also delivers high-resolution imaging to support more effective field development.
Time-depth and waveform data from four aligned VSI versatile seismic imagers place well trajectory on surface seismic survey and reveal faults.
Q-Borehole integrated borehole seismic system avoids pulldown deterioration, offshore Malaysia.
SlimXtreme borehole seismic survey in a deviated, HPHT North Sea well accurately images reservoir beneath chalk layer.
El volumen sísmico en el área Resero presenta un deterioro en la calidad de la imagen en las zonas donde están presentes intrusiones. En este caso el intrusivo está a unos 40 mseg, y hace difícil definir fallas por debajo de él.
Surface seismic imaging is one of the initial stages in oil and gas exploration. Low frequency content and unknown changes associated with surface seismic contribute to the limitations of low resolution and uncertainty in the processing of surface seismic.