Oil discovery in high quality Lower Cretaceous Sandstones with a P50 estimate of 197 MMbbls STOIIP.
Located in the north of block 13/23c, Serenity was discovered by i3 Energy in November 2019 with well 13/23c-10, providing confirmation of i3’s sub-regional subsurface model. It is located between the producing Captain field, to the west, and the undeveloped Tain field immediately to the east.
Well 13/23c-10 encountered a 20ft thick oil-bearing sand (11ft TVT) unit at the top of the Lower Cretaceous Captain sequence. The reservoir quality was high, with porosities averaging 24.5% and oil samples, recovered by wireline, having an API of 31.5°, suggesting that they are very similar to the oil in the Tain and Blake fields. The Serenity reservoir is a pinch-out of the Captain sands against the southern margin of the Halibut Horst, analogous to the Tain and Blake Flank. The sand has 11ft TVT at the 13/23c-10 well and thickens toward the west reaching 115ft TVT in the 13/23a-7z well immediately adjacent to Serenity’s western closure.
The maximum expected oil column of Serenity is 1124ft TVD, from the highest known oil in Tain to the Blake-Liberator-Serenity common OWC, matching i3’s pre-drill predictions and supported by well 13/23c-10 pressure measurements.
i3 is gearing up for a multi-well appraisal programme in the summer of 2020 which will determine the extent of the reservoir thickening to the west and confirm the inferred regional oil water contact. On the basis of information recovered from the 13/23c-10 well, i3 retains its pre-drill P50 estimate of 197 MMbbls STOIIP.