--> ABSTRACT: Structural Style and Reservoir Characterization of, Port Hudson Field, by K. A. Barrell; #91021 (2010)

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Structural Style and Reservoir Characterization of, Port Hudson Field

BARRELL, KIRK A.

A multi-discipline team approach was utilized to re-evaluate the remaining reserves in Port Hudson Field. The structure consists of a complex faulted four-way closure resulting from salt uplift. The producing Tuscaloosa interval consists of two clastic-rich sequences of sand and conglomerates. The lowstand system tracts are predominately conglomerate-rich braided deltas while the transgressive systems tracts are strike trending sandy marine bars. Salt uplift occurred several times resulting in very complex stratigraphic and structural relationships. Post-Tuscaloosa deposition resulted in erosion of two hundred fifty feet of the transgressive Tuscaloosa sand. 3D seismic revealed. that the salt created horst blocks at the top of the structure which exhibited bi-lateral movement during uplift and then withdrawal. 3D imaging revealed much thicker stratigraphic sequences juxtaposed against the horst blocks which resulted in the increase of reserve estimates for the field. The field exhibits a very strong water drive and one thousand feet of structural closure. Faults were examined to determine where seals and conduits exist across the structure. Allen fault planes illustrate that the regional transgressive shale separating the main Tuscaloosa sequences creates localized seals along the fault due to shale smear. The evaluation of water levels indicated that the lowstand system tract reservoirs have excellent vertical permeability which result in drainage across large areas. Understanding the stratigraphy and relationships of the reservoirs along the faults is crucial to determine drainage and workover options. This multi-discipline evaluation of a mature field resulted in the drilling and completion of ten new wells. 

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.