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Our Assets – East Coast

Trinity has been operating and producing offshore the East Coast of Trinidad since 2013. The assets are operated under a licence agreement (Galeota Exploration and Production Licence) with the Ministry of Energy and Energy Industries within the Columbus basin.

East Coast Summary

Assets Working Interest % 2P Reserves
mmboe
2C Resources
mmboe
Avg. Production
bopd
Opex/bbl
US$/bbl
Break-even
US$/bbl
Trintes 100% 14.8 6.4 1,046 121.5 27.8
TGAL 65% 14.5

 

The above summary highlights the robust economics of the East Coast operations as a result of stringent cost control.

The H1 2018 performance metrics summarised above reflected an average oil price realisation of US$60/bbl. With significant oil in place across the basin and low recovery to date significant upside potential resides from the deployment of existing and new technologies and approaches to further develop the Trintes field and the development of TGAL.

In summary:

  • High value, stable production from mature Trintes field
  • Trintes-TGAL re-development targeting sizeable reserves base and net contingent resources could be re-classified (2C -> 2P)
  • Excellent reservoir continuity with the Trintes Field (sep. OWC’s observed)
  • Current production from Trintes to be backed by infill drilling & new TGAL development wells
  • Total STOIIP resources of over 700 mmbbls within NE anticline
  • Surrounded by third party oil and gas infrastructure
  • Prolific basin – Teak, Poui and Samaan fields nearby (850 mmbbls produced to date). Perenco operated
  • Galeota anticline extends to Samaan field (same structural trend)

Going Forward:

  • Trintes-TGAL re-development targeting sizeable reserves base of c. 15 mmbbls, and c. 21 mmbbls of additional net contingent resources could be re-classified (2C -> 2P)
  • Excellent reservoir continuity with the Trintes Field (sep. OWC’s observed)
  • Current production from Trintes to be backed by infill drilling & new TGAL development wells
  • A revised FDP for the TGAL field is being prepared with a view to reducing the capital requirements and technical risk via a phased risk-mitigated plan
  • Rework of the FDP commenced in Q2 2018 with the target of having an updated document resubmitted to the MEEI  during 2018.
East Coast Map
Galeota Block
Structual Cross Section

Columbus Basin

Galeota Block

The Galeota Exploration and Production Licence area covers 121.6 km² in the shallow waters (17m to 45m) of the Columbus Basin off the East Coast of Trinidad.

  • 60’ – 80’ water depth
  • 12km from shore base (boat transfers)
  • 8’’ fluid line to shore
  • Surrounded by third party oil and gas infrastructure
  • Prolific Columbus Basin – Teak, Samaan and Poui fields nearby (850 mmbbls produced to date), Perenco operated
  • Galeota anticline extends to Samaan field (same structural trend)
  • Onshore processing & fiscalisation facilities adjacent to BP/EOG/Perenco

The Galeota Block is within the established oil play of the Columbus Basin and is surrounded by Teak, Poui and Samaan mature oil fields. Exploration and development activity in the Galeota Block began in 1953 with the acquisition of seismic data, and the subsequent drilling of Galeota-1 exploration well in 1961. Ninety two (92) wells (of which approximately ⅔ are development wells) have since been drilled, targeting Pliocene and Pleistocene age reservoirs. Although several hydrocarbon discoveries have been made within the lease, only the Trintes Field, discovered in 1963, was considered to have encountered sufficient volumes to justify development at the time.

The Galeota Block is dominated by the Galeota Anticline, which is the offshore Eastern continuation of the complex Southern Range Anticline. It is a NE-SW trending anticline that plunges towards the North-East.

The Orinoco delta has been a major source of sediment input into the area since the Miocene, continuing through present day. Thick deltaic sand and shale deposits of Pliocene and Pleistocene age underlie the licence. Sediment thicknesses of more than 12,000m are estimated to have been deposited since the Pliocene in the deepest parts of the basin, and sand with excellent reservoir qualities (porosity up to 30%; permeability greater than one Darcy) is widespread. The sand units are subdivided lithologically in the West Galeota area into, from oldest to youngest, the Gros Morne W, V, T, S, P, O, N, and M Sands, and the St. Hilaire H, G, and F Sands.

Trintes Field

Since the Trintes Field came on stream in 1972, an estimated 30.0 mmbbls of oil has been produced via four (4) production platforms (Alpha, Bravo, Delta and Charlie). By the end of 1982, production had peaked to around 5,500 bopd.

Recent remapping undertaken by Trinity has interpreted the reservoirs within the area to be structurally compartmentalized from the surrounding blocks NW-SE trending normal faults.

Base production for this field is maintained through routine recompletions and workovers.

The Trintes Field in 2017 produced an average of 960 bopd (H1 2018: 1,046 bopd) with a continuing platform-based rig programme to workover the existing well inventory. Currently twenty three (23) wells are producing from the Alpha and Bravo platforms.

Factors Controlling Oil and Gas Accumulation

The trapping mechanism in these fields is a combination of both stratigraphy and structure. Both North and South flanks of the anticlines provided extensive area from which oil and gas migrated updip into sands on the crest and upper flanks of the anticline. Minor faults which are common across the Trintes Field act as seals to reservoirs, since oil and gas are found downdip of faults below water levels of the same sand in adjacent blocks. The reservoirs are supported by an active water drive mechanism.

Development

Early phase development of these fields included the drilling of a high density of wells in the Central crestal area of the anticline in close proximity to the four (4) platforms. Trinity has undertaken a thorough reservoir modelling exercise from extensive historical appraisal and development drilling which resulted in a comprehensive database of formation depths, thicknesses and petrophysical properties. This has been supplemented with 3D seismic data and recently reprocessed 3D OBC seismic data by Trinity.

To date F, G, H, M, N and O Sand remapping of the Trintes Field has been completed. It has been identified that there are un-drained reserves in each subject fault block from the mapping of these shallow reservoirs. As such, additional development targets were identified. These wells will be drilled as horizontal to high angle wells to maximize targeted pay zones to achieve higher production rates and the ultimate cumulative production from the mapped fault blocks.

TGAL and Exploration Prospectivity

Five (5) exploration wells drilled between 1964 and 1985 discovered hydrocarbons in multiple stacked reservoirs. These five (5) discoveries were not developed because they were considered to be non-commercial at that time. The data derived from the exploration campaign was utilised in the Trintes Field development.

In 2014, the TGAL-1 exploration well drilled by Trinity Exploration and Production (Galeota) Limited, 2km North-East of the Trintes Alpha Platform, encountered multiple stacked pay reservoirs. Hydrocarbons were encountered in five (5) major stacked reservoirs (G, H, M, Lower M, N and O Sand) with a net pay range of 448 – 546ft. TGAL-1 proved the extension of the Trintes Field to the North-East.

TGAL-1 Development

Multiple targets have been identified in TGAL-1, to be drilled during the first development phase, from the first of possibly multiple conductor supported platforms. Additional targets in the N and O Sands in the Eastern most undrained fault in Trintes will also be drilled from the same platform.

TGAL 1
2014 CRS Reprocessed of 3D OBC