Shearwater GeoServices has been awarded a contract for a 4D seismic monitor undertaking at Equinor’s Mariner discipline offshore UK.

The geoservices agency mentioned this would be the third Isometrix survey over the sphere, and its second 4D monitoring survey (3D knowledge acquired over the identical space at totally different occasions).

These “time-lapse” surveys assist maximise manufacturing from current fields by offering subsurface knowledge to replace reservoir modelling and manufacturing simulations.

The one-month undertaking will likely be executed in the course of the summer season 2022, the corporate added.

“Time-lapse seismic acquisition is a essential exercise for maximising worth creation from offshore oilfield belongings, which is why our purchasers choose world main know-how for these surveys,” mentioned Shearwater CEO Irene Waage Basili.

“We’ve a long-established observe document of executing 4D seismic surveys for Equinor and we sit up for return to the Mariner discipline to seize high-quality geophysical knowledge for our consumer.”

Mariner began manufacturing in 2019 after a £6.4 billion funding from Equinor. One of many largest fields within the UK sector for a decade, it was mentioned on the time to have the ability to produce by way of to 2050.

Nonetheless, in January Equinor revised down its reserve estimates from the east of Shetland discipline by practically 35%, from 275 million barrels to round 180 million, prompting an impairment of £1.3 billion.

Mariner produces from two reservoirs – Heimdal and Maureen – which have “a variety of uncertainty given the excessive subsurface complexity and early procution part of the sphere”, Equinor mentioned.

An up to date seismic interpretation final 12 months, and expertise from manufacturing at Maureen, led to its downgrade.

Equinor operates the sphere and holds 65.11% fairness, alongside companions JX Nippon (20%), Siccar Level (8.89%) and ONE-Dyas (6%).

In a subsequent assertion on the Oslo Bors, Siccar Level mentioned the operator’s revision was “untimely” and pre-empted the findings of a three way partnership working group arrange that month.