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Continuing Insights into Structure and Stratigraphy of the Onshore Gulf Basin from Prestack Depth Imaging of Mega-Regional Strike Lines from South Texas to the Florida Panhandle

Ed Haire¹, Don Howard¹, and Barbara Radovich²
¹INEXS, 1980 Post Oak Blvd., Ste. 2050, Houston, Texas 77056
²ION Geophysical, 2105 CityWest Blvd., Suite 900, Houston, Texas 77042–2837

Mega-regional 2D prestack depth migrated (PSDM) strike lines can provide advances to the interpretation of the onshore Gulf Basin framework. Continuous seismic lines with consistent depth processing across nearly the full extent of the onshore portion of the basin allow onshore depocenters, structural axes, and canyons to be seen in their regional context. Plays dependent on new horizontal wells can be tied from west to east around the basin and clearer relationships established. In addition, potential extrapolations of existing plays can be interpreted.

A preliminary interpretation is presented of an initial version of a key composite strike line that is made up of 41 legacy 2D lines and PSDM processing by ION Geophysical. This mega-regional line is 714 mi (1149 km) long. Its location is highlighted on the included index map which also shows the location of the entire Gulf of Mexico framework seismic program. This is one of a series of seven composite strike lines of approximately 8500 mi (13,679 km) and 380 individual line segments that ranges from a line hugging the coast to the northernmost line which traverses the East Texas Salt Basin, Sabine Uplift, North Louisiana Salt Basin, Mississippi Interior Salt Basin, and Wiggin’s Arch to the Florida Panhandle. The strike lines tie together with existing megaregional dip lines and the survey spans across the basin from South Texas to Alabama and from the northern limit of the onshore Gulf Basin to the abyssal plain. The dip lines in some cases have been extended landward to tie the new strike grid. The interpretation has been tied to well control with a series of synthetics and check shot surveys and a comprehensive database of well tops.


AAPG Search and Discovery Article #90158©2012 GCAGS and GC-SEPM 6nd Annual Convention, Austin, Texas, 21-24 October 2012