Direct determination of stacking velocities in three dimensional

Direct time lapse inversion of seismic data

Directional acoustic logger apparatus and method

Directional long array for logging vertical boundaries

Discrete-frequency multipole sonic logging methods and apparatus

Discriminating natural fracture- and stress-induced sonic...

Displacement field calculation

Display of common depth point seismic data with velocity correct

Display of response characteristics of seismic source arrays

Diving-wave migration using airy functions

Downhole casing inspection system

Downhole doppler flowmeter

Downhole electromagnetic seismic source

Downhole fracture analysis

Downhole fracture detection and characterization

Downhole processing of sonic waveform information

Downhole seismic exploration device and apparatus

Downhole sensor networks using wireless communication

Downhole tool for determining in-situ formation stress orientati

Drilling system with an acoustic measurement-while-driving syste