Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1974-12-30
1982-09-07
Birmiel, Howard A.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
73152, 364422, G01V 140
Patent
active
043487483
ABSTRACT:
Illustrative embodiments of the present invention include methods and apparatus for processing geophysical signals derived from sources located at different positions in a borehole to obtain displacements which are then combined to determine the relative position of formation characteristics. The geophysical signals are correlated by pairs using substantially overlapping correlation intervals to obtain sequences of displacements for each pair. Displacements from each sequence are combined in possible corresponding relationships and classified in an angular classification system relative to the position of the sources of the correlated signals. Displacements from overlapping sequences are also combined and classified, and an analysis is then performed on the classified combinations to determine which combinations are valid.
Invalid displacements, for example, are sometimes produced by the failure of the borehole tool used to derive the signals to remain in the preferred position in deviated holes. An analysis for the exaggeration of certain relationships allows detection and rejection of the associated displacements. Apparently poor quality displacements, although perhaps invalid or inaccurate, are not discarded, even where enough apparently good quality displacements are present. Instead, all possibly corresponding displacements are considered for analysis. In the analysis, displacement combinations including invalid displacements form groups separate from valid combinations. Combinations including inaccurate displacements form groups about the valid combinations and aid in defining the position of the valid group.
With the position of the valid group located, combinations from each sequence of displacements which belong to this group may then be retrieved and used to determine the corresponding relative position of the formation characteristic. When applied to dipmeter signals, the method produces more accurate and geologically consistent dip and azimuth values for subsurface formations.
REFERENCES:
patent: 3068400 (1962-12-01), Castel et al.
patent: 3466532 (1969-09-01), Kolb
"Stratigraphic Applications of Dipmeter Data in Mid-Continent", Campbell, Jr., The American Association of Petroleum Geologists Bulletin, vol. 52, No. 9, Sep. 1968.
"Automatic Computation of Dipmeter Logs Digitally Recorded on Magnetic Tapes", Moran et al., Society of Petroleum Engineers of AIME, Paper No. SPE174, Journal of Petroleum Technology, Jul. 1962, pp. 3-19.
"The High Resolution Dipmeter Tool", Allaud et al., The Log Analyst, May-Jun., 1969.
"Computer Methods of Diplog Correlation", Schoonover et al., Society of Petroleum Engineers Journal, Feb. 1973.
Clavier Christian M. J.
Dumestre Alexis C.
Hepp Vincent R.
Birmiel Howard A.
Schlumberger Technology Corporation
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