Wireline logging for coal exploration in Australia

Journal Article · Sat Jan 01 04:00:00 EST 1977 · Log Anal.; (United States)

OSTI ID:7141403

Peeters, M; Kempton, N H

Slim wireline logging tools are run in all coal exploration holes drilled for Shell in Australia. Wireline logs not only provide valuable information on seam continuity, inter-seam lithologies and overburden type, but also enable accurate seam thickness determination and depth correction of cores. Recently, petrophysical methods developed in the oil industry were introduced to establish quantitative relationships between wireline log readings and various coal properties, in particular, raw ash content. The vast number of logs generated in a coal drilling program and the need for their quick evaluation led to the adoption of Shell's existing data management system for hydrocarbon logs. Logs are digitized and, together with the mathematically derived formulae relating specific coal properties to log response, are entered into a computer program package. Currently this package can produce ash content and bulk density values per depth interval, and average values per seam both in printed and graphical form. Results are illustrated with examples from the Degulla field (ATP 137C) in the Galilee Basin, Queensland. New tools are being developed to increase the number of coal properties which can be derived from wireline logs. Once coal petrophysics becomes a mature science it is expected to produce substantial savings both in coring and core analysis costs and in the length of field drilling operations. Computer processing of log and core data will accelerate prospect evaluation and mine planning.

• OSTI ID: 7141403
• Journal Information: Log Anal.; (United States), Journal Name: Log Anal.; (United States) Vol. 13:3; ISSN LGALA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ASHES
AUSTRALASIA
AUSTRALIA
CALIPER LOGGING
COAL DEPOSITS
COAL RANK
DATA ANALYSIS
DENSITY
ELECTRIC LOGGING
GAMMA LOGGING
GAMMA-GAMMA LOGGING
GEOLOGIC DEPOSITS
MOISTURE
NEUTRON LOGGING
NEUTRON-GAMMA LOGGING
NEUTRON-NEUTRON LOGGING
PHYSICAL PROPERTIES
RADIOACTIVITY LOGGING
RESIDUES
RESISTIVITY LOGGING
RESOURCES
WELL LOGGING