Geophysical log documentation of fluid migration from compacting shales: A mineralization model from the devonian strata of the Pine Point Area, Canada

Journal Article · Tue Nov 01 00:00:00 EST 1983 · Econ. Geol.; (United States)

DOI:https://doi.org/10.2113/gsecongeo.78.7.1364· OSTI ID:6710009

Smith, N G; Kyle, J R; Magara, K

The compaction history of a shale sequence can be evaluated through the interpretation of sonic logs that measure porosity as a function of transit time. Downward dewatering of a shale sequence is indicated by the presence of an undercompacted zone which overlies a normally compacted shale zone and permeable strata. Evaluation of sonic logs for the Middle Devonian shale sequences of the Mackenzie Basin indicates that a substantial volume of water could have been generated by late-stage shale compaction. This derivation of metal-rich formation water is compatible with mineralization features of the reefal carbonate-hosted PbZn sulfide deposits of the Pine Point district. Furthermore, the pattern of shale compaction trends within the basin suggests that expelled fluids migrated within linear conduits, a feature that could have regional exploration significance.

• Research Organization: Department of Geological Sciences, The University of Texas at Austin, Austin, Texas
• OSTI ID: 6710009
• Journal Information: Econ. Geol.; (United States), Vol. 78:7
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
CANADA
OIL SHALE DEPOSITS
EXPLORATORY WELLS
SONIC LOGGING
MINERALIZATION
SEISMIC SURVEYS
RESERVOIR ROCK
PERMEABILITY
POROSITY
ROCK-FLUID INTERACTIONS
CARBONATE ROCKS
DEVONIAN PERIOD
EXPLORATION
GEOLOGIC HISTORY
GEOLOGIC MODELS
GROUND WATER
REEFS
RESERVOIR FLUIDS
WATER REMOVAL
ZINC SULFIDES
CHALCOGENIDES
FLUIDS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
HYDROGEN COMPOUNDS
INORGANIC PHOSPHORS
MINERAL RESOURCES
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PHOSPHORS
REMOVAL
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SULFIDES
SULFUR COMPOUNDS
SURVEYS
WATER
WELL LOGGING
WELLS
ZINC COMPOUNDS
040100* - Oil Shales & Tar Sands- Reserves & Exploration- (-1989)
040201 - Oil Shales & Tar Sands- Site Geology- (-1989)