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The AAPG/Datapages Combined Publications Database

South Texas Geological Society Special Publications


Contributions to the Geology of South Texas, 1986
Pages 368-379

Balcones Volcanoes in South Texas: Exploration Methods and Examples

Thomas E. Ewing


Methods for studying the largely submarine volcanic centers of the Balcones igneous trend in South Texas include description of outcrops, subsurface mapping (including paleotopographic and isopach mapping), analysis of core and cuttings, and geophysical techniques. Examples of the three geologic techniques demonstrate their usefulness in understanding the basic reservoir units of the trend, and in exploring for them. The four classes of reservoirs associated with the volcanoes — palagonite tuff, overlying Dale Limestone, draped San Miguel and Olmos Sandstones, and fractured chalk — can best be explored for and developed using a combination of these techniques.

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