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Caliper Location of Leached Zones in Colorado Shale.

Authors
Thomas-HE; Smith-JW
Source
Log Analyst July-aug 1970 1970 11(4):12-16
Link
NIOSHTIC No.
10010272
Abstract
Accurate estimation of oil yields in Green River Formation oil shale requires knowledge of the presence or absence of cavities (vugs) left after the natural removal of the mineral nahcolite (nahco3). Conventional well logs have not provided a means for detecting the vugular porous zone. This paper describes a 3-arm caliper logging system, logging technique, and mathematical correction method used by the Bureau of Mines to locate and compensate for the vugular porosity. The caliper defines the zone by sensing a high frequency of minor diameter variations as small as 1/10 inch. Estimations of oil yields and oil shale reserves from density logs can be significantly improved when the vugular zone's thickness is known. A porosity-density correction method is presented.
Publication Date
19700101
Document Type
OP;
Fiscal Year
1970
NTIS Accession No.
NTIS Price
Identifying No.
OP 121-70
Issue of Publication
4
NIOSH Division
LERC;
Source Name
Log Analyst, July-Aug. 1970, V. 11, No. 4, PP. 12-16
State
CO;
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