AWE Limited has announced that preliminary analysis of wireline log and pressure data from has confirmed the southern extension of the Waitsia Gas Field.
The latest well in the onshore Western Australia field confirms Waitsia’s rating as the biggest conventional gas discovery in Australia for more than 30 years.
The Waitsia-3 appraisal well has encountered strong gas shows across a 150m gross interval including the Kingia and High Cliff Sandstone reservoir targets.
The well was successfully drilled to a Total Depth of 3,612 m Measured Depth below Rotary Table (MDRT) into crystalline basement, having drilled through all primary and secondary targets.
The Kingia reservoir was penetrated on prognosis at 3,211 m MDRT, while the High Cliff Sandstone was intersected 80 m deeper than predicted at 3,362 m MDRT due to a thicker than expected section of Kingia Sandstone and Bit Basher Shale.
Strong gas shows were encountered in the Kingia and High Cliff Sandstone intervals as well as minor shows in the Irwin River Coal Measures. Three sections of core were cut in the Kingia reservoir and all cores were sent for analysis. The well has been cased and suspended for future testing and production.
Importantly, preliminary interpretation of the Kingia reservoir shows excellent conventional reservoir qualities, among the best observed in the field to date, and considerably better than pre-drill estimates. The gross Kingia reservoir interval of 52 m contains 20 m of net gas pay with reservoir quality exceeding that intersected in Waitsia-1 and Waitsia-2. The Kingia net reservoir interval in Waitsia-3 is approximately double that observed in other wells in the field and confirms the laterally extensive nature of this excellent reservoir, which is particularly encouraging given the large step-out from previous wells.
AWE’s ceo and managing director, David Biggs, said the results at Waitsia-3 has significantly exceeded pre-drill expectations.
“The substantial thickness of the Kingia reservoir, combined with exceptional porosity, net pay and low levels of total inerts, confirms excellent reservoir quality in the southern extent of the Waitsia Field.
“The observation of gas below the previously interpreted GWC may also have positive implications for the rest of the field and provide new appraisal and exploration opportunities within the permits.
“We will continue our analysis and evaluation of the Waitsia-3 data, but we are already looking ahead to the Waitsia-4 appraisal well which is expected to spud in the first half of July,” he said.
“The combined data from Waitsia-3 and Waitsia-4 will allow us to review our estimated Reserves and Resources for the entire Waitsia Field and, subject to Waitsia-4 results, we anticipate a further upgrade to Reserves within the second half of calendar year 2017,” Mr Biggs added.
Waitsia-3 is the first of a two well appraisal drilling programme planned for the Waitsia field in 2017 designed to appraise the gas potential in the southern extension of the Waitsia Field. Waitsia-3 is located approximately 19.8 km east-south-east of Dongara, Western Australia, and 10.8 km south of Waitsia-1.