Forties Blend Quality

The information provided herein is for information only and does not affect the rights or obligations of any party pursuant to applicable FPS Transportation and Processing Agreements or other agreements.

The information provided herein is given in good faith but its accuracy is not warranted and INEOS FPS Limited and its affiliates will have no liability to any party arising out of or in connection with the provision of such information or any party's reliance upon it regardless or any negligence or breach of duty of INEOS FPS Limited or its affiliates.

Forties Blend crude oil changed in quality at the beginning of 2007 when crude oil from the Buzzard field began production through the FPS. Although there are over seventy other fields making up Forties Blend, Buzzard is now the largest component field and it has altered the hydrocarbon characteristics of the Blend.

A detailed assay for Forties Blend is published on and can be accessed using the following link: Forties Blend Assay

Buzzard is a medium gravity, sour crude with an API of 32.6º and a whole crude sulphur level of 1.44% wt. Distillation of the crude produces a yield structure similar to the Urals Blend exported to North West Europe. Buzzard is sour but is not otherwise poor in quality. The acidity is low with a Total Acid Number of 0.09 mgKOH/g. The pour point is + 6 degrees C and the metals levels reasonably low at 4.8 ppm wt nickel and 13.8 ppm wt vanadium.

We have based the information in this release on Buzzard assay data provided by CNOOC, the Buzzard Operator, from appraisal wells drilled some time ago. As updated Buzzard assay data may become available and when such data has been provided to INEOS, we will update the information in the release accordingly. Indications to date are that production from the Buzzard field is consistent with the original assay.

The table below shows a prediction of the proportion of Buzzard oil in Forties Blend over the following 4 months.

We have prepared this using the information provided by Field Operators which INEOS has not overviewed. We cannot guarantee the accuracy of this information but it does represent the best information made available to the FPS operator by Field Operators.

June 23 23.3% 218.8
July 23 24.3% 209.9
August 23 27.9% 176.1
September 23 21.3% 221.7

FPS will endeavour to update the above information on a monthly basis. Please note that the Forties Blend is now showing unstabilised crude oil mbpd instead of stabilised crude oil, as the Buzzard % was taken in relation to unstabilised SCO.

The following table can be used to estimate the approximate properties of the Forties Blend based on the content of Buzzard Crude:

Buzzard % vol API Sul (%wt)
0% 44 0.27%
5% 43.2 0.34%
10% 42.4 0.41%
15% 41.7 0.48%
20% 41 0.55%
25% 40.3 0.62%
30% 39.6 0.68%
35% 39 0.75%
40% 38.4 0.81%
45% 37.8 0.87%
50% 37.2 0.93%
55% 36.7 0.99%
60% 36.2 1.05%


The proportion of Buzzard oil entering the FPS System for 2023 is shown below:

1Q 2023 1 2 January to 8 January 28%
  2 9 January to 15 January 27%
  3 16 January to 22 January 27%
  4 23 January to 29 January 25%
  5 30 January to 5 February 20%
  6 6 February to 12 February 27%
  7 13 February to 19 February 25%
  8 20 February to 26 February 26%
  9 27 February to 5 March 26%
  10 6 March to 12 March 26%
  11 13 March to 19 March 27%
  12 20 March to 26 March 24%
2Q 2023 13 27 March to 2 April 25%
  14 3 April to 9 April 24%
  15 10 April to 16 April 21%
  16 17 April to 23 April 22%
  17 24 April to 30 April 12%
  18 1 May to 7 May 0%
  19 8 May to 14 May 21%
  20 15 May to 21 May 27%
  21 22 May to 28 May 30%

FPS will endeavour to update the above information on a weekly basis. To view previous quarters for 2010 to 2022 please use the links below:

Previous 2022 Quarters (PDF 130KB)previous 2021 quarters (PDF 99KB) Previous 2020 Quarters (PDF 102 KB) Previous 2019 Quarters (PDF 90 KB) Previous 2018 Quarters (PDF 86 KB) Previous 2017 Quarters (PDF 86 KB) Previous 2016 Quarters (PDF 133 KB) Previous 2015 Quarters (PDF 146 KB) Previous 2014 Quarters (PDF 69 KB) Previous 2013 Quarters (PDF 69 KB) Previous 2012 Quarters (PDF 77 KB) Previous 2011 Quarters (PDF 77 KB) Previous 2010 Quarters (PDF 76 KB)

Impact on Forties Blend crude oil quality during the 2023 summer field and FPS Maintenance season

During the Summer, operators of platforms in the North Sea often take the opportunity of the favourable weather period to perform routine maintenance on their equipment. This can result in individual fields reducing crude production or being taken off-line. 

The production rate from the Buzzard field is expected to vary this Summer, and a number of other fields are being taken off-line.  This will vary the percentage of Buzzard crude in the Blend and cause the Forties Blend sulphur and API gravity to fluctuate. The charts below show the projected API gravity and sulphur levels of Forties Blend for this maintenance period.

Sulphur levels of Forties Blend:Shutdown quality profile - 20-01-2023 - Sulphur.png

The API gravity:Shutdown quality profile - 20-01-2023 - API.png

This data is based on the forecast production rates and qualities for fields supplied by each FPS shipper to the FPS operator. As new forecasts are provided by FPS shippers, we will update the projected Forties Blend quality information.

As individual platforms come back online through May, August and September, we expect the Forties Blend quality to revert back to a steady quality of approximately 0.65% sulphur and an API of 41.0º.