Cadre Field: A Recent Discovery in the Mature Vicksburg Trend of South Texas

D. N. Witter, R. L. Mathis, and T. N. Diggs

Extensive use of 3D seismic surveys in the Vicksburg trend of south Texas has improved our ability to accurately resolve complex fault traps below the resolution of conventional 2D seismic data. Integration of subsurface information with high quality 3D data creates opportunities for enhancing exploration success. Cadre Field, discovered in 1992, is an excellent example of the high volume potential existing in a mature trend. Cadre is located along the McAllen structural nose, a northwest/southeast trending structural feature providing strike roll for several fields along its length. The field is an upthrown fault closure against the Monte Christo Fault, a major structural flexure trending northeast/southwest. Key reservoir data were provided by two downdip wells which pe etrated large-scale Vicksburg deltaic sand sequences. These data points, integrated with reservoir analog models from McAllen and Schmidt Fields, led to the drilling of the Cadre discovery well which flowed 12.7 MMCFD with 262 BCPD from three commingled zones. Subsequent development wells indicate Cadre Field EUR to be 100 BCF, with cumulative production to date of 35 BCFG and 500 MBC. Three stacked reservoirs are characterized by highly variable porosity and water saturation, resulting in variable well performance. Nine of the ten wells drilled on the structure have been successful.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California