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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Sonic Logging in South Texas
W. P. Biggs
ABSTRACT
The Sonic Log has proven itself a valuable aid to reservoir evaluation and fluid detection in South Texas. Use of the short-spacing, two-receiver device provides a sharply detailed, continuous velocity log that is not affected by hole size or mud type.
Porosity resolution of the sonic log is excellent, particularly in limestone and compacted sand formations. The linear relation between porosity and the recorded interval transit time facilitates scaling and reading of the log. In the less consolidated zones, corrections are applied for lack of compaction, presence of hydrocarbons, and presence of shale.
In high porosity sands of South Texas gas saturation has been strikingly indicated by cycle skipping. Also in these zones, a qualitative comparison of resistivity measurements and formation velocities has readily distinguished gas, oil, and water levels.
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