The Corsair Trend is a geopressured gas play located offshore Texas. Bigenerine humble; sands are the primary objective along the trend where deep geopressured accumulations are trapped in large anticlinal rolls into the basinward dipping Corsair fault system. Improved seismic data, more favorable economics for deep gas, and reaction to a key discovery all led to deeper exploration and ultimate success in the trend.

Sand distribution suggests a major deltaic system was located in the central Corsair area during the Middle Miocene. Sedimentary loading by the delta was at least in part responsible for the formation of the fault and the trend's characteristic structural style. Petrographic studies indicate reservoir quality is dependent both on this original depositional environment and also diagenesis.

Total estimated proven reserves for the trend are greater than 2 TCF. The largest field to date is Shell's Picaroon Field where estimated reserves exceed 500 BCF of gas in a corrosive, hard geopressured, high temperature environment. Here, a 3D seismic survey has resolved structural and stratigraphic details and allowed optimum field development.

Figure. Picaroon, Brazos A-20 Field.

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