Boots – shoes – and leggings
Patent
1989-08-31
1992-08-25
Hayes, Gail O.
Boots, shoes, and leggings
324345, E21B 2900
Patent
active
051424720
ABSTRACT:
A method used for determining true in-situ resistivity of a thin layer within a formation from dual induction log data. The method calculates true resistivity without the existing need: 1) for an accurate estimate of the layer thickness, or 2) to extrapolate correction factors for thin layers. The method first corrects resistivity data read from the dual induction log. A representative shoulder bed resistivity is first determined from average deep resistivity data near the shoulder bed. A paired estimate of layer resistivity and thickness is then computed based upon the determined shoulder bed resistivity, dip angle, and both deep and medium resistivity data related to the thin bed. The method does not require thickness data to be input, and in fact outputs this infomation, if needed.
REFERENCES:
"Well Logging for Earth Scientists", by Darwin V. Ellis, Chapter 6, Induction Devices, pp. 99-121, Elsevier Science Publishing, 1987.
"Theory of Induction Sonde in Dipping Beds", R. H. Hardman and L. C. Shen, Chapter 6, pp. 6.1-6.52, Well Logging Technical Report No. 5, Oct. 25, 1984, University of Houston.
Schlumberger Log Interpretation Charts, 1989, Induction Charts, pp. 82-94.
Hayes Gail O.
Jacobson William O.
Union Oil Company of California
Wirzbicki Gregory F.
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