Final Petrophysical Interpretation Substantially Upgrades Charlie-1 Net Pay
88 Energy Limited (“88 Energy” or the “Company”, ASX:88E, AIM 88E) is pleased to provide the following update related to results from the Charlie-1 appraisal well, on the North Slope of Alaska.
· Final petrophysical interpretation, using sophisticated Laminated Sand Analysis, substantially upgrades net hydrocarbon pay in the Charlie-1 well
· Interpretation integrates log data and advanced lab analysis of cores taken during drilling, including excellent liquid hydrocarbon saturations from both Dean Stark and core NMR1
· Increase in pay despite higher cut off values being used to determine pay zones
· Pay zones also high graded vs initial interpretation with lower water saturation / higher oil saturation and better average porosity
· Final petrophysical interpretation will now be integrated into revised mapping of the Seabee and Torok discoveries to determine resource estimates
· Data room for the next Project Icewine farm-out to be opened in the near term
· Thermal maturity of the HRZ shale confirmed as in the peak oil generation window
1 Nuclear Magnetic Resonance analysis performed on cores under laboratory conditions
The final third party petrophysical interpretation from the recently drilled Charlie-1 well are detailed in the table below. These values consider data from logs obtained during drilling using a sophisticated logging suite as well as multiple laboratory analyses of sidewall cores taken from the key horizons in the Charlie-1 well. Encouragingly, the final interpretation provides a significant increase in net pay, compared to the initial interpretation, of 398′ (vs 280′), with the largest contribution coming from the Lima discoveries in the Seabee Formation. These improvements are despite using higher cut-offs for both reservoir and net pay.
Cut-offs: PHIT>9%; SWT<70%, Vshale<40% (previously: PHIT>=8.5%; SWT<=80%, Vshale<=40%)
Both Upper and Lower Lima are confirmed as large oil discoveries by this interpretation and the lab results. The results are particularly significant as these targets are the most extensive of the Icewine conventional horizons as well as being relatively shallow, by comparison to the Torok Formation. The extent of the accumulations will be estimated over the coming weeks as these final petrophysical numbers are integrated into the updated seismic inversion product.
Similarly, the Stellar targets in the Torok Formation are also confirmed as hydrocarbon discoveries with good liquid hydrocarbon content. There remains some uncertainty about the gas to oil ratio as the liquid hydrocarbon saturations measured from the Charlie-1 cores in the lab imply much lower gas to oil ratio than that observed during the downhole tests, which recovered gas condensate. It is possible that these liquids may be unlocked by stimulation of the reservoir.
The Kuparuk also remains a prospective target, with anomalously good reservoir quality for its depth, however, no mapping has been done for this horizon and it is considered more gas prone than the Torok Formation.
Example of core calibration to final petrophysics
The attached document – available at http://www.rns-pdf.londonstockexchange.com/rns/6833Y_1-2020-9-10.pdf – includes the following graphics:
Fig. 1: Photo under white light and UV light displaying strong fluorescence associated with the presence of oil in core taken from Upper Lima
Fig. 2: Core NMR data showing distribution of fluid in the same core from Fig. 1. Note the significant free oil saturation measured in Region 2 of the map
Fig. 3: Excellent match between petrophysical interpretation and actual core measurements
HRZ Thermal Maturity – Peak Oil Generation Window
Measurements taken from both core and cuttings have confirmed that the HRZ shale at the Charlie-1 location has a vitrinite reflectance value of 0.9 (VRo %), which is within the peak oil generation window. This was also confirmed by isotope analysis of mud gases recovered whilst drilling. The confirmation of the thermal maturity model is very encouraging and further work is ongoing regarding producibility of the shale.
Managing Director of 88 Energy, Dave Wall, stated: “The results from the Seabee, despite Charlie-1 not being optimally located, are outstanding. Whilst these may appear as a serendipitous by-product of the well, internal analysis prior to drilling had already significantly high graded this formation; however, it was too late to change the objectives/location of the well meaning that work remained largely on the drawing board. This final interpretation is a strong vindication of that internal effort. We are now looking forward to the conclusion of the evaluation of the Seabee oil discoveries as we integrate the petrophysics into the seismic inversion and subsequent mapping, which will ultimately yield updated volumetrics for our resources that will feed into the Icewine farm-out process.
Good progress continues to be made at the newly acquired Project Peregrine on both the farm-out and permitting/planning fronts. Additional news related to that will be provided to the market in a separate announcement in the near term.
Finally, the confirmation of the ideal thermal maturity for the HRZ shale is encouraging and will form the basis of further work to continue to unlock its large potential.”
Reporting requirements under LR 5.30
The Charlie-1 well is located on the North Slope of Alaska, ADL 393380, where 88 Energy has a 30% working interest (increasing to 75%). The well penetrated sandstones in seven stacked targets and shale in one target. No flow tests were undertaken; however, gas condensate samples were retrieved to surface from the Torok formation at 10,506′ and 10,656′ using a downhole sampling tool (Ora) run during the wireline operation.
This announcement has been authorised by the Board.