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Oil & Gas Training
and Competency Development
Competency Management system SLB NEXT

Borehole Seismic Technology

Borehole Seismic data provides the critical depth and velocity parameters needed to link seismic data with downhole log and well data.

Borehole seismic tools have evolved from single-component sensors to modern seismic arrays. These moden tools, when combined with the latest technology in seismic source quality, navigational positioning, and computational abilities, can deliver in real time high-resolution borehole seismic images that extend beyond the wellbore or into the interwell volume to reduce risk in drilling and development decisions

This course provides a review of the latest tools, technologies, and applications of borehole seismic technology. A discussion of survery design and modeling is also included. This will provide an understanding of the applications of Borehole Seismic Data to Exploration, Reservoir Description, and Production.

Day 1

Geophysical Principles

The seismic method-seismic response-basic concepts-reflection and refraction-velocity-seismogram -borehole vs surface seismic-types of borehole seismic.

Sources and Tools

Impulsive Sources (Airguns) - control systems - Non-impulsive sources (Vibros). Borehole seismic tools, classifications, characteristics - CSI and VSI

Day 2

Checkshot Sonic Calibration and Well Tie

Velocities - The Sonic Tool - Sonic Scanner - Checkshot Survey - Drift - Sonic Calibration and Synthetic Seismogram

VSP Processing

Multiples - Processing Sequence - Stacking, Normalization & Filtering - Upgoing and Downgoing Energy - Deconvolution - Corridor Stack

Day 3

VSP Processing - Anisotropy and AVO

Phase Matching - estimation of Q-Factor - concepts of anisotropy - Thomsen Parameters - AVO calibration - parameters from walkaway and walkaround VSP - parameters from other sources

VSP Imaging

Offset VSP coverage - Data Processing - NMO/CDP mapping - GRT migration - Walkaway VSP coverage - VSP in deviated wells - 2D and 3D VSP

Day 4

Survey Design and Modeling

Practical and theoretical modeling concerns - basic modeling - ray tracing modeling

Reservoir, Production, and Drilling Applications

Salt proximity surveys - Aplanatic method - Deeplook CS - Time-Lapse BHS surveys - single well survey - seismic while drilling (SWD) - Look-ahead VSP - Borehole Microseismic surveys

Day 5

Examples

Exercises

Case Histories

Learning activity mix

Geologists and Geophysicists who need an understanding of the principles, uses, and applications of Borehole Seismic Data

Geophysical Principles

Sources and Tools

Check-shot/Sonic Calibration and Well Tie

VSP Processing

Anisotropy and AVO

VSP Imaging

Survey Design and Modeling

Reservoir, Production & Drilling Applications

Examples, Exercises, and Case Histories

Basic understanding of Geology and of the Geophysical method

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