ADX strikes gas at surface as Austrian testing springs to life

The West Australian

Feb 16

ADX Energy has finally cracked the seal at its Welchau-1 well in Upper Austria, with early flow-testing delivering the company its first confirmed hydrocarbon gas to surface from its shallow Reifling ...

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A modest six cubic metres of acid was pumped into the Reifling Formation to stimulate fractures in the carbonate rocks, followed by a brine flush and a soak period. When the well was swabbed to unload the hydrostatic column, the result was brine, carbon dioxide and, critically, methane gas flowing to surface.The company says the methane at surface shows not only that hydrocarbons are mobile within the Reifling Formation, it also represents the first gas ever produced from this reservoir.The Reifling Formation sits at the top of four stacked, fractured carbonate reservoirs intersected by Welchau-1 and is interpreted to lie close to the oil-water contact of a mapped light oil accumulation. Notably, that oil system is believed to crest around 500 metres up dip from the current well location, immediately flagging an obvious next target should ADX elect to sidetrack.Management says the fact that a relatively small amount of acid was used to kick the well into life is a strong positive, pointing to a reservoir that wants to flow once fully cleaned up. The next phase will see further swabbing to strip out remaining fluids and test whether Welchau can deliver sustained oil, gas, or both, with samples, pressure data and – if the well keeps flowing – hard flow-rate numbers to follow.ADX first drilled the Welchau-1 well in 2024 and instantly lit up screens after cutting a massive 450-metre hydrocarbon column, spanning three primary carbonate reservoirs that screamed big-ticket potential.Early reads pointed to a liquids-rich gas and condensate system, with upside estimates ranging from 12 to a hefty 217 million barrels of oil equivalent (MMboe) and a mean sitting around 85MMboe.But the plot thickened just months later. Fresh technical work suggested the system could actually be driven by high-quality light oil, with gas merely along for the ride – a pivot that, if confirmed, could materially sharpen the project’s economics and push Welchau firmly into the top tier of Alpine oil and gas plays.Downhole sampling has already recovered light oil, while the pressure data suggests the well may be connected with the down-dip Molln-1 gas-condensate field, first discovered by Austria’s national oil and gas company, OMV, in 1989. If proven, it could mean ADX is onto an interconnected petroleum system with serious scale potential.Welchau is characterised by over-pressured reservoirs and multiple hydrocarbon source rocks across several formations, giving ADX more than one shot on goal. The company can either sidetrack Welchau-1 to chase the up-dip light oil accumulation or deepen the well to test deeper gas-condensate targets beneath the anticline.The road here hasn’t been smooth. Testing was halted in early 2025 after objections from environmental groups, before the Upper Austrian State Administrative Court ruled last September that ADX could resume operations. With rods turning again and gas now proven at surface, the project is firmly back in business.While the current phase is focused on cleaning up the well and gathering hard data, the implications appear clear. If flow rates stack up, Welchau could rapidly shift from a technical success to a commercially compelling Alpine hydrocarbon play, with multiple appraisal options and plenty of blue-sky still left in the system.Is your ASX-listed company doing something interesting? Contact: matt.birney@wanews.com.au","kind":"highlight","is_publish_news":true,"is_publish_highlight":false,"is_publish_live":false,"is_publish_wemedia":null,"editions":null,"column":"","sentiment":"0","news_tag":"","news_rank":0,"symbols":[],"gpt_button":0,"need_auth":false,"code":"91000000","status":"200"}}}