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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Oil 
Production
From Volcanic Rocks of the Balcones Fault Region
Abstract
Igneous rocks associated with the Balcones Fault Zone extending from Kinney County in southwest Texas through Travis County in central Texas have produced oil from more than 40 different fields dating from 1915. These rocks, referred to as serpentine by petroleum geologists, have been the subject of continued debate regarding their origin. Abundant evidence exists to support the conclusion that these igneous bodies are of volcanic origin related to crustal tension. Production
is shallow and in many instances quite economic. Most discoveries were made by surface geology or random drilling. Geophysical data have been used in exploration and have proved to be accurate.
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