The Huntington Field, Block 22/14a, UK North Sea

Abstract

The Huntington Oil Field is located in Block 22/14b in the Central Graben of the UK Continental Shelf. The reservoir is the Forties Sandstone Member of the Sele Formation, and oil production is from four production wells supported by two water-injection wells, tied back to the Sevan Voyageur FPSO (floating production storage and offloading unit). Initial estimates of oil-in-place were c. 70 MMbbl and the recovery factor at the end of 2017 after 4.5 years of production was 28%, which reflects the weak aquifer and poor pressure support from water injection. The Huntington reservoir is part of a lobate sheet sand system, where low-concentration turbidite sands and linked debrites are preserved between thin mudstones of regional extent. Within the reservoir, three of the thicker mudstone beds can be correlated biostratigraphically on a regional basis. This stacked lobate part of the system sits above a large-scale deep-water Forties channel that is backfilled by a system of vertically aggrading channel storeys. Despite the relatively high net/gross of the reservoir, the thin but laterally extensive mudstones in the upper (lobate) part of the system are effective aquitards and barriers to pressure support from water.

Impact of Fluid Distribution and Petrophysics on Geophysical Signatures of CO2 Storage Sandstone Reservoirs

“…We selected our samples from the rock repository at the Rock Physics laboratory at the National Oceanography Centre (NOC RPL), Southampton, considering the petrographic, physical, elastic and transport properties described for the Johansen and Cook Formations (see above), that is, the target formations of Aurora's CCS reservoir. We found rock samples with similar properties within the Forties Formation (sandstone), well 22/14a‐2 in the Central Graben of the UK Continental Shelf, North Sea (Couch et al., 2020), around 2640 ± 30 mbsf. From there, we selected three samples (here referred to ST1, ST2, and ST3) with a volume of clay‐sized particles (C, which includes both major and clay minerals) ranging from 10% to 26% and porosities above 0.2 (Table 1; Figure 2), to study the effect of both parameters on the elastic and transport properties during and after CO 2 injection.…”

UK oil and gas fields: an overview

“…The outer parts of the field have essentially been redeveloped through these approaches and more than 170 MMbbl have been developed since the Apache acquisition in 2003. Similarly dependent on seismic attributes to reduce both exploration risk and volumetric uncertainty,Goffey et al (2020) describe the discovery and development of the Brechin Field, a 7 MMbbl confined, channel-fill sandstone reservoir tied back to the MonArb complex Couch et al (2020). detail the Huntington Field, located some 20 km to the north of Brechin Field.…”