AWE Limited, the Operator of Permits L1/L2 in the Perth Basin, Western Australia, disclosed Tuesday that wireline log and pressure data from the Waitsia-1 appraisal well confirm a 311.7 foot (95 meter) gross gas column across three conventional reservoir intervals in the Waitsia field, confirming initial results from the discovery well (Senecio-3) and identifying substantial upside potential.
The well was drilled to a revised total depth of 11,506 feet (3,507 meters) Measured Depth below Rotary Table (MDRT), having drilled successfully through the full prospective section and into the Holmwood Shale. The primary and secondary targets were penetrated at depths close to prognosis with good gas shows being encountered in the Kingia, High Cliff and Dongara Sandstones. Gas shows were also observed in the Irwin River Coal Measures and the Carynginia Shale.
A Gas-Water Contact (GWC) for the Waitsia field was established at 10,991 feet (3,350 meters) total vertical depth subsea 11,260 feet (3,432m MDRT) which is approximately 1,148 feet (350 meters) below the top of the mapped structure. Wireline pressure data indicate that the three good quality reservoir intervals in the Kingia and High Cliff Sandstones are likely to be continuous with equivalent zones in the Senecio-3 well. Overall reservoir quality appears to be better than Senecio-3 with considerable thickening of the High Cliff Sandstone pay interval. Conventional net gas pay for the well is interpreted to be 59 feet (18 meters) with average porosity of 18 percent. Preliminary compositional analysis indicates carbon dioxide (CO2) levels of less than4 percent, which is consistent with Senecio-3.
A tight gas reservoir, equivalent in quality to Senecio-3, was also encountered in the shallower Dongara Sandstone and further confirms the extent of the Senecio field.
The data acquired so far support the previously announced gross 2C Contingent Resource estimate of 290 billion cubic feet (Bcf) of gas for the Waitsia field, and the thickening of the net conventional gas pay in Waitsia-1 indicates considerable potential upside. The gas bearing intervals appear to be in pressure communication across the northern culmination from Senecio-3, indicating that this region of the field has sufficient resources for commercial development. Planning for early production from Waitsia-1 and Senecio-3 is under way.
The Managing Director of AWE, Bruce Clement, said the excellent results from the Waitsia-1 appraisal well highlighted the significant conventional gas production potential of the north Perth Basin.
“The further success in Waitsia-1, following discoveries in the Senecio-3 and Irwin-1 wells, has reconfirmed the potential of the North Perth Basin to deliver substantial volumes of commercial gas into the Western Australian domestic gas market. Further work is now underway to quantify the additional gas resource indicated by the thicker, better quality sands intersected in Waitsia-1,” he said.
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