Pasca A development project overview
Quick facts
| Lease | PPL 328 (APDL 14) |
| Location | Gulf of Papua, Offshore Papua New Guinea |
| Water Depth | 93 metres |
| Discovered | Pasca-1 (1968) |
| Field Type | Liquids-rich gas-condensate accumulation in carbonate pinnacle reef |
| Status | Resources certified, Gas Agreement signed and FEED underway |
Field background and technical context
The Pasca A gas condensate field is a carbonate pinnacle reef that was discovered some 50 years ago but then lay dormant with no further technical follow-on work for nearly three decades. Twinza acquired the field in 2011 and completed drilling of a new appraisal well in 2018. Improvements in drilling efficiency, production technology and development engineering have transformed the technical and commercial viability of the Pasca A gas condensate discovery. These findings and Twinza's proposed development concept have been presented to the government.
The relatively shallow water depth (93 metres), benign tropical metocean conditions, close proximity to landfall (95 kilometres), and rich hydrocarbon liquids-yield of the gas make the Pasca A field an ideal candidate for development.
Geological understanding and development concept
Twinza unlocked the geological aspects of the field through integration of a variety of data sources and development drilling. In addition to the historical data from the three wells drilled and previous 2D seismic surveys, Twinza improved the initial understanding of the field using 3D seismic data, innovative analysis combined with modern interpretation tools, and the application of modern core analysis techniques including derivation of digital rock properties. The integration of this data revealed an improved understanding of the field’s potential.
In September 2017 Twinza spudded the Pasca A4(AD-1) well with an objective to complete appraisal of the Pasca A field and suspend the well as a future development well for the first offshore field development in PNG. The well not only confirmed the pre-drill expectations but exceeded them, proving that the field resource was more than sufficient to underpin an economic development.
Twinza’s team of technical experts has completed a detailed plan of development which focuses on early condensate and LPG production and subsequent gas export as LNG. This concept supports the application for a Petroleum Development Licence (PDL).
The base case plan of development is a cost effective, low-footprint concept which is both highly efficient and has the potential for further optimisation and enhancement. Enhancements to the project cost, schedule and production forecasts continue to be incorporated into the plans as the Company refines the development plan, together with work to prove the sustainability of the project.
In March 2023, Twinza announced a 35% increase in the independently assessed Pasca A resource. The independent assessment sets out the gas, condensate and LPG recoverable volumes in accordance with the guidelines set out in the Petroleum Resource Management System (PRMS) published by the Society of Petroleum Engineers. The most recent assessment was completed in April 2023 and classified recoverable resources of 90 mmbbl condensate and LPG plus a recoverable gas of 464 bcf.
Licence interests
Twinza applied for the petroleum prospecting licence in 2008 and was awarded PPL 328 in October 2011. Twinza holds a 95% working interest in PPL 328.
On 29 May 2024, Twinza executed binding transaction documents with Mineral Resources Development Company Limited (MRDC), a state-owned enterprise. Under the terms of the agreements, MRDC and its associated trustee entities will acquire up to a 50% Participating Interest in the Pasca Project. This investment is being facilitated through Hevehe Petroleum Limited (Hevehe), a special purpose vehicle formed by MRDC, with shareholding comprising MRDC, MRDC-managed trustee companies, and the Gulf Provincial Government.
Following the execution of the Pasca Gas Agreement, the Pasca Project Final Investment Decision (FID) is anticipated to occur in 2026.
Project milestones and regulatory progress
Since the award of the licence in 2011, better technical interpretation of the data combined with technological advances in drilling and development methods have transformed the opportunity. Twinza has re-interpreted all of the historical data and supplemented this with modern data and an appraisal well, which has resulted in the confirmation of the resource.
The Pasca A field was declared a Discovery Location by the Papua New Guinea regulator in April 2015. On 30 June 2015 Twinza, as the JV operator, submitted an application for a Petroleum Development Licence (PDL) together with the Pasca A field development plan. Following this, the Company entered into negotiations with the Government of Papua New Guinea to secure a Pasca Gas Agreement, which outlines the fiscal and development terms governing the Pasca Project.
In anticipation of the PDL grant, Twinza has undertaken all necessary work to prepare for execution of the project. These activities include completion of an environmental impact assessment at the field location in the Gulf of Papua and Twinza receiving the Environmental Permit for operations. Social mapping and landowner identification studies have been completed and the results provided to the government.
A major milestone was achieved on 19 December 2024, when the Pasca Gas Agreement was formally signed at Government House in Port Moresby. The signing ceremony was attended by Prime Minister James Marape, Governor-General Sir Bob Dadae, Twinza’s Executive Chairman Stephen Quantrill, and MRDC Managing Director Augustine Mano. The Pasca Gas Agreement provides a clear pathway for the award of the PDL, which will follow the declaration of FID.
Engineering and execution planning
Twinza has completed the concept selection phase of the Pasca A development project. This phase included gathering of basic data including site survey, geotechnical soil investigation, metocean data gathering and analysis, and drilling of an appraisal well to obtain data related to rock and fluid properties. Concept engineering work into the well completion design, gas processing solution and utilities, and offshore infrastructure for production, storage and offloading has been completed. Twinza has undertaken pre-front end engineering and design (FEED) studies and commenced FEED in January 2025
The development engineering is based on three wells: two production wells and a single injector. These wells are tied back to a minimal wellhead platform which is braced to an adjoining self-installing platform which hosts the processing and utilities topsides. Condensate and LPG extracted from the gas during Phase I is stored on a floating storage and offloading vessel accessible from the platform via a retractable gangway, whilst the residual dry gas is reinjected into the reservoir.
For the second phase of development, a floating liquefaction storage and offloading (FLSO) vessel will be moored close to the central processing facility and the residual gas will be re-routed via a flowline to the FLSO. At this time the injection well will be re-purposed as a production well simply by reversing the direction of flow in the well.
Concept selection work on the second phase of development associated with LNG export was undertaken in 2019. The field development plan was updated to include this work on Phase II of the development and was submitted to the government.
Current activity and next steps
Pre-FEED engineering has been completed and Twinza established an integrated project management team in January 2025 to progress and refine the FEED design for Phase I. It is anticipated that FID will be reached in mid-2026, before which engineering will have been completed and invitations to tender for the project scope issued to potential contractors and fabrication yards.
It is anticipated that immediately after FEED for the first phase has been completed, the second phase of development will start. Whilst these two phases of development are separate, they are sequentially linked.
Mobile Offshore Production Unit (MOPU), Floating Storage and Offtake (FSO) and Minimum Wellhead Platform (MWP)
Mobile Offshore Production Unit (MOPU), Floating Storage and Offtake (FSO) and Minimum Wellhead Platform (MWP)
Minimum Wellhead Platform (MWP) and Mobile Offshore Production Unit (MOPU)
Mobile Offshore Production Unit (MOPU)
Mobile Offshore Production Unit (MOPU)