Review of fracture detection with well logs
Conference
·
OSTI ID:7311828
Most systems in use today for fracture detection still employ measurements of acoustic amplitudes. Presentations may vary but basic format includes recording an acoustic travel time curve and photographically recording an oscilloscope displaying an acoustic wave train in various modes. The acoustic amplitude measurements covered by this paper are records of the attenuated signal of compressional and shear wave studies. A technique for reducing an attenuation factor through reduction of transmitter to receiver spacing is described. Actual field examples will illustrate transmitter/receiver spacings varying from four feet to less than one foot. The latter spacing, incorporated in an unique sidewall acoustic logging instrument, has much sharper interface resolution than that obtained from classical acoustical logging devices; and produces a cleaner wave form with an easier defined shear wave. Examples are shown of acoustic logs made under various conditions and results are discussed. Fractures or fracturing characteristics of various formations may be determined from rock moduli logs utilizing compressional and shear travel times with bulk density from density logs. Formation strength parameters as derived from these logs are shown. A newly developed log analysis technique is offered for low permeability, but often partially fractured, carbonate reservoirs. The concept allows an identification of potential pay zones first; then, detailed information on reservoir rock properties, such as: total porosity and secondary porosity.
- OSTI ID:
- 7311828
- Report Number(s):
- CONF-761008-155
- Country of Publication:
- United States
- Language:
- English
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