Method of detecting and characterizing features in a borehole

Details Method of detecting and characterizing features in a borehole Method of detecting and characterizing features in a borehole

1988-01-26

1988-12-13

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 33, 367 27, 181105, G01V 140

Patent

active

047916192

ABSTRACT:
Using waveforms or travel time acquired by multitransmitter and/or borehole sonic tools, acoustic velocity (or slowness) is computed for compressional, shear, and Stoneley waves using direct phase determination (DPD), the slowness time coherence (STC) method, and multiple shot processing (MSP). There is a nonzero difference between transmitter and receiver delta-t's (slownesses) when the sonic tool is in the vicinity of a borehole feature, such as a fracture or a borehole enlargement. The amount of the difference, T/R delta-t, for compressional, shear and Stoneley waves depends on the size and nature of the fracture(s). It is possible to determine the height, width, and dip angle of the fracture when the T/R delta-t's are used in conjunction with other model data. It is also possible to distinguish between borehole enlargements and fractures with the method of this invention.

REFERENCES:
patent: 4314339 (1982-02-01), Kenyon
patent: 4543648 (1985-09-01), Hsu
patent: 4562556 (1985-12-01), Ingram et al.
"Semblance Processing of Borehole Acoustic Array Data," Kimball et al., Geophysics, vol. 49, #3, 3/84, pp. 274-281.
"Fracture Evaluation Using Borehole Sonic Velocity Measurements," Liu, O. Y., SPE paper #14399.

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