Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1989-01-23
1991-08-06
Wieder, Kenneth A.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
324366, 166250, 175 50, G01V 320
Patent
active
050381083
ABSTRACT:
A method of determining parameters of a geological environment having a known electrical resistivity R.sub.h, with a heterogeneity in the environment having an electrical resistivity R.sub.e, and with a borehole extending into either the environment or the heterogeneity at an unknown distance p from the interface between the environment and the heterogeneity. A measuring assembly is extended into the borehole, including an electrical emitter and two or more electrical detectors. Electrical energy is applied to the emitter and detected by one of the detectors at a distance d from the emitter, and the borehole resistivity R.sub.a at the distance d is determined. This is repeated for others of the detectors at other distances d. A curve is plotted of the resistivity ratio R.sub.a /R.sub.h as a function of the distance d. The plotted curve is compared with previously obtained curves of the resistivity ratio R.sub.a /R.sub.h as a function of d for various combinations of the values of the resistivity ratio R.sub.h /R.sub.e and the borehole-interface distance p, and a resistivity ratio R.sub.h /R.sub.e and a borehole-interface distance p are determined for the plotted curve. The resistivity R.sub.e of the heterogeneity is then calculated. The location of the heterogeneity can be determined from the distance p, and the nature of the heterogeneity is indicated by its resistivity R.sub.e.
REFERENCES:
patent: 3838335 (1974-09-01), Miller
patent: 4278942 (1981-07-01), Bonnet et al.
patent: 4296379 (1981-10-01), Yoshizumi
patent: 4335353 (1982-06-01), Lacour-Gayet
patent: 4601353 (1986-07-01), Schuh et al.
patent: 4646026 (1987-02-01), Chemali et al.
Lessi Jacques
Wittrisch Christian
Edmonds Warren S.
Institut Francais du Pe'trole
Wieder Kenneth A.
LandOfFree
Determing parameters of a geological environment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Determing parameters of a geological environment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determing parameters of a geological environment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1989713