Lithology identification using sonic data

Details Lithology identification using sonic data Lithology identification using sonic data

1990-05-21

1991-09-10

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 74, 364421, 364422, G01V 130, G01V 140

Patent

active

050479911

ABSTRACT:
A method of identifying lithology of a formation traversed by a borehole from which sonic data is acquired is disclosed. The sonic data acquired comprises a data set of m waveforms, each of the waveforms including a formation wave component digitized into n samples. The formation wave component comprises direct wave components and typically reflected wave components, converted wave components, and noise. A preferred lithology identification method comprising the steps of characterizing the n samples of each formation wave component as a vector, obtaining a first eigenvector based on the formation wave component vectors, selecting a formation wave component vector, calculating a projection of the selected wave component vector on the first eigenvector, and identifying the lithology of the formation through which the selected wave component passed based on the projection of the selected wave component vector on the first eigenvector. If desired, more than one eigenvector may be obtained, and the selected formation wave component vector can be projected on the more than one eigenvectors to identify lithology. Lithology is identified due to the fact that the projection of wave components traveling through a formation of certain lithology will tend to congregate; i.e. their amplitudes along an axis or along several axes will be similar for a given lithology.

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