acoustic logging

Acoustic logging measures and records the velocity of acoustic energy (seismic waves) in the material adjacent to the borehole. A transmitter located at one end of the sonde generates an electro-mechanical pulse that is transmitted through the borehole fluid into the borehole wall and by refraction to a receiver located at the other end of the sonde. The propagation velocities of the seismic waves can be calculated by travel times and distance traveled from transmitter to receiver. The devices must be operated in a fluid-filled borehole.

Compressional, shear, and surface waves propagate in and along the wall and then, as compressional waves, back through the borehole fluid to the receiver. Compressional waves have the highest velocity and arrive first, followed by the shear waves and the surface waves. Borehole Compensated Sonic logging tools with two receivers and transmitters cancel the borehole fluid travel times so that only the refracted wave paths through the borehole wall are measured. Sonic logging tools are often combine with other tools such as Resistivity, Nuclear, and borehole geometry tools for a complete formation evaluation solution.

Applications:

• Porosity determination
• Correlation to surface seismic data with synthetic seismograms
• Identification of pore pressure changes
• CBL-VDL Measurement
• Time to Depth correlation

Features and benefits:

• Combinable with Resistivity, Acoustic, and Auxiliary Logging for a complete Formation Evaluation Solution
• Compatible with Warrior™Acquisition System
• Customizable to client Surface Acquisition System
• Works on proprietary PTX Telemetry System