Ultra-High Pulse Power Acoustic Logging with Broad-Band-Width, Low-Frequency, and Multipole Transmitters and Receivers--A Discussion of Data and Analysis for a Variety of Interpretive Techniques
HUSTEN, PETER, DOUG PATTERSON, JOHN WATSON, STEVE GILL, and BILL VOLK, Magnetic Plus Incorporated, Fremont, CA
Current technology of acoustic logging has been limited to monopole and dipole sources and receivers. The shear wave can be accurately recorded with this technique but has inferior results in softer formations. We present a method for acoustic logging with many magnitudes times the power of conventional technology for improved depth of investigation, and improved signal in soft formations. The technique uses electromagnetically driven acoustic transmitters to generate a broad-band-width signal. The formation propagates a particular frequency depending on how hard or soft the rock. This ensures that a strong first arrival of shear wave is identified by the receivers. In addition to monopole and dipole, quadrupole transmitters and receivers are used in the configuration for logging thro gh casing. We present examples for hard, soft, and very soft formation from monopole, dipole, and quadrupole sources both in open hole and cased hole. Interpretive techniques are applied to this data for the evaluation of porosity, rock mechanical properties, fracture detection, fracture prediction, correlation to shear seismic data, and hydrocarbon indication in clastics.
AAPG Search and Discovery Article #91009©1991 AAPG-SEPM-SEG-SPWLA Pacific Section Annual Meeting, Bakersfield, California, March 6-8, 1991 (2009)