Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
Part 4 - Berg - Hughes Center
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greater than 90 md, most of the Travis Peak has permeability of less than 0.1 md.<br />
Porosity in sandstones ranges from 3 to 17% but is mostly less than 8%.<br />
Oil and gas accumulations in the Hosston are closely associated with salt-cored<br />
structures in east Texas and north Louisiana. It is an important source of oil and gas-<br />
distillate in many fields of north Louisiana and east Texas, with production generally<br />
coming from three zones, the upper 300 ft, the middle 300 ft and the basal 200 ft. The<br />
depths to the reservoirs in Caldwell, Richland and Franklin Parishes are estimated to<br />
range between 4,000 and 13,700 ft.<br />
Sligo Formation<br />
Producing Parishes<br />
Caddo, Bossier, Webster, Ouachita,<br />
Claiborne, Lincoln, De Soto, Bienville,<br />
Natchitoches, Winn<br />
The Hosston is transitional with the limestone and dark gray shale of the Sligo<br />
Formation. Early workers (Breedlove and Ogden, 1955; Nichols 1958; Murray, 1961)<br />
reported an early Cretaceous age for the Sligo and correlated this unit with the Nuevo<br />
Leon Stage of the Upper Coahuilan Series. These workers published thicknesses for the<br />
Sligo of less than 100 ft in south Arkansas and greater than 500 ft in central Louisiana.<br />
According to Hermann (1971), the Sligo in Rapides Parish of central Louisiana forms a<br />
large bioherm of least 450 ft thick. This main reef trends northerly through eastern<br />
Natchitoches, western Grant, and western Winn Parishes. The northern extent of the reef<br />
trend turns eastward through northern Winn, southern Jackson, and central Caldwell<br />
Parishes. The reef facies thins in Caldwell Parish.<br />
Nichol’s (1958) description for the Sligo in the "Ark-La-Tex" region is as follows:<br />
gray to brown shales, limy shales and limestones, locally contain lentils of dark gray<br />
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