ADX Energy Ltd
Independent Review Validates ADX Energy Ltd's Sicily Channel Gas Play With Up To 1,265 BCF Of Prospective Resources
ADX Energy Ltd (ASX: ADX) has received an independent technical review of its Sicily Channel gas exploration position, with RISC Advisory Pty Ltd confirming the geological validity of the Terravecchia Formation biogenic gas play. This ADX Energy Sicily Channel gas play independent review validated resources assessment confirms the company's evaluation approach as reasonable for the CR 150.AU Permit offshore Italy.
According to the ASX release dated 6 July 2026, RISC's work supports ADX Energy Ltd's prospective resource estimates of up to 1,265 billion cubic feet (BCF) of unrisked recoverable gas (P10, arithmetic sum) across nine prospects and leads, and provides guidance for the planned forward work programme.
The company holds a 100% interest in the CR 150.AU Permit in the Sicily Channel offshore Italy.
"The Board of ADX is very encouraged by the findings of the independent review conducted by RISC. RISC has endorsed the work done by our technical team and concurs with our planned work program to unlock the Permit's potential," said Ian Tchacos, executive chairman of ADX Energy Ltd.
"Our technical team led by Mr Paul Fink (our CEO) has uncovered a strategically important and significant gas play in an ideal location to access energy starved European gas markets. The Sicily Channel represents an optimal location for delivering gas into Europe via the Transmed pipeline which is adjacent to the Permit."
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What Did the Independent Review Cover and Why Does It Matter?
RISC Advisory was engaged by ADX Energy Ltd to carry out an independent assessment of several key areas:
- The validity of the Miocene-age Terravecchia Formation biogenic gas play in the Sicily Channel
- The available geological and geophysical data, including wells and seismic
- The assumptions and probabilistic methodology used by ADX Energy Ltd for its prospective resource estimates
- The forward work programme planned for the CR 150.AU Permit
RISC is described in the ASX release as an independent energy advisory group with offices in London, Perth, Brisbane and South East Asia, which has completed assignments in more than 90 countries for over 500 clients.
Furthermore, according to the announcement, RISC's conclusions and recommendations can be grouped into several key areas of interest to investors.
Validation of the Terravecchia Biogenic Gas Play
RISC recognised the Miocene-age Terravecchia Formation as a valid biogenic gas play in the Sicily Channel, supported by regional geology and offset well data. This is consistent with nearby producing gas fields, specifically:
- The Lippone-Mazara gas field onshore
- The Argo-Cassiopea gas developments offshore
In addition, RISC highlighted that sandstones within the largely shaley Terravecchia Formation in offset wells surrounding the Permit frequently displayed elevated mud gas shows in historical drilling.
Mud gas shows are increases in gas content detected in drilling fluids. They indicate the presence of gas in rock formations being drilled and can be an important first-pass indicator that a play is gas-charged.
For investors, this third-party confirmation means the play concept that ADX Energy Ltd is targeting is described as geologically credible in the same basin where gas is already in production.
Assessment of ADX Energy Ltd's Resource Methodology
According to the announcement, RISC reviewed the probabilistic methodology used by ADX Energy Ltd to estimate prospective resources and accepted the approach as a reasonable representation of reservoir properties. Consequently, RISC confirmed that:
- Lead and prospect areas used in calculations were reasonable
- Reservoir thickness assumptions used to estimate gas volumes were reasonable
RISC further stated that logging data from offset wells supports an increase in net reservoir thickness for the High Case Resource (P10) calculations compared with the values used by ADX Energy Ltd.
That comment is particularly relevant because net reservoir thickness is a key driver of gas volume estimates. A thicker effective reservoir interval generally implies higher potential volumes, all else being equal, suggesting that ADX's high-case estimates may be conservative on thickness in some areas.
The review therefore not only validates the methodology but also points to potential upside in the P10 case if further work confirms thicker net reservoir intervals.
Endorsement of the Forward Work Programme
RISC endorsed the planned work programme for the Permit, including:
- Acquisition of modern 3D seismic for final, pre-drill prospect definition and improved mapping of reservoir geometry and continuity
- Application of Direct Hydrocarbon Indicator (DHI) workflows for using seismic attributes that may indicate gas presence, aiming to reduce exploration risk before drilling decisions
ADX Energy Ltd stated that it accepts and concurs with RISC's conclusions and recommendations and intends to continue to dedicate significant personnel and financial resources to mature the Permit for drilling.
Breaking Down the Sicily Channel Resource Numbers
The independent review referenced previously reported prospective resources in the CR 150.AU Permit (ASX reporting date 2 December 2025). These estimates were prepared by ADX Energy Ltd in accordance with the Society of Petroleum Engineers Petroleum Resources Management System (SPE-PRMS 2018).
The ASX release provides the following unrisked recoverable prospective resource estimates for the Upper Miocene biogenic gas play in the Permit:
| Prospect / Lead | Low P90 (BCF) | Best P50 (BCF) | Mean P(Mean) (BCF) | High P10 (BCF) | ADX equity interest |
|---|---|---|---|---|---|
| 1 | 22 | 60 | 77 | 158 | 100% |
| 2 | 26 | 64 | 80 | 160 | 100% |
| 3 | 46 | 111 | 136 | 267 | 100% |
| 4 | 17 | 41 | 51 | 101 | 100% |
| 5 | 25 | 60 | 74 | 146 | 100% |
| Sub-total (1–5) | 136 | 336 | 418 | 832 | |
| 6 | 18 | 43 | 52 | 102 | 100% |
| 7 | 15 | 37 | 46 | 90 | 100% |
| 9 | 19 | 68 | 103 | 241 | 100% |
| Sub-total (6,7,9) | 52 | 148 | 201 | 433 | |
| TOTAL (Arithmetic Sum) | 188 | 484 | 619 | 1,265 | 100% |
According to ADX Energy Ltd, these are prospective resources, not reserves. They are unrisked recoverable estimates calculated using probabilistic methods, and the totals represent arithmetic sums of individual prospect and lead estimates.
Key points for investors:
- The Low (P90) case for the Permit totals 188 BCF
- The Best (P50) case totals 484 BCF
- The Mean case totals 619 BCF
- The High (P10) case totals 1,265 BCF
- ADX Energy Ltd holds 100% equity in all listed prospects and leads
Prospects and leads 1 to 5 were included in prior reporting. Prospects/leads 6, 7 and 9 are described as additional inventory not previously reported, contributing an additional high-case arithmetic sum of 433 BCF.
ADX Energy Ltd reiterates that Prospective Resources are quantities of petroleum that may potentially be recovered from undiscovered accumulations. They carry both a risk of discovery and a risk of development, and require further exploration, appraisal and evaluation — including drilling — to determine if a significant recoverable resource exists.
Educational Section: Understanding Biogenic Gas and Resource Terms
To interpret this update from ADX Energy Ltd, some basic concepts are useful, particularly for investors without a specialist petroleum background.
What Is Biogenic Gas?
Biogenic gas is natural gas that forms at shallow depths in the subsurface due to microbial activity. Micro-organisms break down organic material in sediments, generating methane-rich gas at lower temperatures and shallower depths than conventional thermogenic gas.
In the Sicily Channel case, the target is the Terravecchia Formation, a Miocene-age sequence roughly 5 to 23 million years old. The formation contains sandstones within predominantly shaley intervals, and these sandstones have shown elevated mud gas readings in historic wells around the Permit area.
The presence of nearby biogenic gas fields such as Argo-Cassiopea offshore and Lippone-Mazara onshore demonstrates that this type of gas system is already productive in the broader area.
Why Can Biogenic Gas Plays Be of Interest to Investors?
Biogenic gas systems can have characteristics that may appeal to companies and investors:
- Shallower targets can mean lower drilling costs compared with deep high-pressure systems
- Where the geology is well understood from nearby wells and seismic data, the geological risk may be lower than for frontier deep targets
- Gas located near existing infrastructure, such as pipelines, may have clearer routes to market if discovered in commercial volumes
However, it is important to note that these are general characteristics. ADX Energy Ltd's CR 150.AU Permit still requires 3D seismic acquisition, detailed interpretation and drilling before any commerciality assessment is possible.
Key Resource and Technical Terms
| Term | Plain-language explanation |
|---|---|
| BCF | Billion cubic feet, a standard unit to describe gas volumes. |
| Prospective resources | Estimated quantities of petroleum that may be recoverable from undiscovered accumulations, assuming future exploration success. They are not discovered resources. |
| P90 / P50 / P10 | Probability-based cases: P90 (Low) means there is at least a 90% chance that the actual recovered volume will be higher than this estimate. P50 (Best) is the middle case with 50% probability. P10 (High) is an upside case with only a 10% chance of being exceeded. |
| Probabilistic methodology | A statistical approach that uses ranges for key variables (like reservoir thickness, area and recovery factor) to generate a distribution of possible outcomes rather than a single number. |
| 3D seismic | A geophysical survey technique that creates a three-dimensional image of rock layers beneath the surface, used to map traps, faults and reservoirs before drilling. |
| Direct hydrocarbon indicator (DHI) | Seismic attributes or responses that may suggest the presence of hydrocarbons, such as specific amplitude or phase changes, when calibrated to known fields. |
| Biogenic gas | Gas formed by biological (microbial) processes at shallow depths rather than by heat and pressure acting on deeply buried organic material. |
| SPE-PRMS (2018) | The Petroleum Resources Management System published by the Society of Petroleum Engineers in 2018, a widely used standard framework for classifying and reporting petroleum resources and reserves. |
These definitions provide context for reading both the ADX Energy Ltd announcement and future technical updates relating to the Permit.
Strategic Location and Infrastructure Context
The ASX announcement describes the Sicily Channel as a highly prospective gas play and a strategic asset in terms of access to European gas markets. Key locational points drawn from the release include:
- The CR 150.AU Permit is located offshore Italy in the Sicily Channel
- It is near the Argo-Cassiopea producing offshore gas fields and the Lippone-Mazara producing gas field onshore
- It sits adjacent to local gas pipeline infrastructure, including the Transmed pipeline
The Transmed pipeline is a major gas transmission route that transports gas from North Africa to Italy, with onward connection into European markets. ADX Energy Ltd states that the Sicily Channel represents an optimal location for delivering gas into Europe via the Transmed pipeline.
For investors, proximity to existing gas infrastructure can be material because it may reduce capital intensity if commercial gas is discovered. Furthermore, it can provide clearer marketing pathways and situates the project within a region where gas demand remains an important part of the energy mix.
Forward Work Programme for the CR 150.AU Permit
According to the ASX release, ADX Energy Ltd's planned work programme for the Sicily Channel includes the following stages:
| Stage | Activity | Objective |
|---|---|---|
| Current / near term | Further data purchases and analysis | Refine existing geological interpretation and prospect/lead definitions. |
| Pre-drill | Acquisition of new, state-of-the-art 3D seismic | Achieve higher resolution imaging for final prospect definition before committing to drilling. |
| Pre-drill | Application of DHI workflows | Use seismic attributes to assess potential hydrocarbon presence and reduce exploration risk. |
| Ongoing | Additional independent technical reviews | Maintain technical scrutiny and provide updated information to shareholders as the Permit is matured for drilling. |
| Longer term | Exploration drilling (subject to future decisions) | Test the most attractive prospects defined from 3D seismic and DHI work. |
RISC has specifically supported this forward programme, describing it as appropriate for pre-drill prospect definition and resource de-risking. ADX Energy Ltd indicates that these steps are designed to move the Permit towards a drill-ready status while maintaining a high level of technical rigour and external validation.
Investment Relevance: Key Points for ADX Energy Ltd Shareholders
While the ASX announcement is technical in nature, several points are of direct relevance to investors assessing ADX Energy Ltd and its Sicily Channel position:
-
Independent technical endorsement — RISC's review confirms that the Terravecchia biogenic gas play is valid in this region, the resource estimation approach is reasonable, and there is a basis to consider additional upside in high-case reservoir thickness.
-
Resource scale and exposure — An arithmetic sum high case of 1,265 BCF and best case of 484 BCF place the CR 150.AU Permit in the range of a large prospective gas inventory in a European context, subject to exploration outcomes. ADX Energy Ltd's 100% equity interest means it currently retains full exposure to any future resource conversion.
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Established analogues and data support — Nearby Argo-Cassiopea and Lippone-Mazara gas fields provide direct analogues for the biogenic gas play concept, while elevated mud gas shows and well log data from offset wells offer further data support.
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Structured, endorsed work programme — The combination of 3D seismic, DHI workflows and continued independent reviews gives investors a clear set of future milestones to monitor, including completion of 3D seismic surveys and any future drilling decisions.
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Communication and transparency — ADX Energy Ltd states that it aims to keep shareholders "appropriately informed" and will pursue ongoing independent technical reviews, signalling an intention to maintain external checks on its internal work.
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Why the Sicily Channel Update From ADX Energy Ltd Matters
For ASX energy investors monitoring emerging gas exploration positions, the 6 July 2026 ASX release sets out three main themes central to the ADX Energy Sicily Channel gas play independent review validated resources story:
- A validated geological play in a basin that already hosts producing biogenic gas fields
- A material scale of unrisked prospective resources, reported under SPE-PRMS (2018), across nine prospects and leads in which ADX Energy Ltd holds 100% interest
- An independent endorsement of both the technical methodology and the planned pre-drill work programme, including 3D seismic and DHI analysis
The independent review by RISC does not remove geological or commercial risk, and the resources remain prospective rather than discovered. However, it provides additional technical context and external validation for investors evaluating the company's European gas exposure and upcoming exploration activities in the CR 150.AU Permit.
Want to Learn More About ADX Energy's Sicily Channel Gas Play?
ADX Energy Ltd (ASX: ADX) holds a 100% interest in the CR 150.AU Permit offshore Italy, where an independent review by RISC Advisory has validated a biogenic gas play carrying up to 1,265 BCF of unrisked prospective resources across nine prospects and leads. With endorsed pre-drill work underway and a strategic location adjacent to the Transmed pipeline, investors looking to understand more about the company's European gas exploration position can visit the ADX Energy website for further information.
