SUBSCRIBER NOTE: Platts proposes to discontinue Stybarrow, AHS Crude Index

Platts is proposing to discontinue its assessments for Australia's Stybarrow crude with effect from November 2, 2015, following the shut in and disconnection of the oil field. BHP Billiton has shipped its final Stybarrow crude cargo from the oil field off Western Australia. The field, owned 50:50 by a joint venture between BHP Billiton and Woodside Petroleum, have produced a total of nearly 60 million barrels. The field started up producing at close to 80,000 b/d, but output had fallen to 3,476 b/d by the first quarter of 2015, according to data from Woodside. The cessation of the Stybarrow field will be subject to an environment plan approval process by Australia's National Offshore Petroleum Safety and Environmental Management Authority. With the discontinuation of Stybarrow crude, Platts is also proposing to discontinue the Asian Heavy Sweet (AHS) Crude Index with effect from November 2, 2015. The AHS composes an arithmetic average of assessments at Asian market close of Australian heavy sweet crude grades Enfield, Stybarrow and Vincent. In the interim period, Stybarrow crude's spot price will be assessed based on its gross product worth using the last known crude assay and yields, and values relative to other similar crudes in the region. For a complete list of all affected assessments and their PGA codes, please see the table below.

CODE ASSESSMENT PGA PAGE AARAH00 Stybarrow FOB Australia S'pore Close MH2218, MH2219, MH2240 AARAI00 Stybarrow FOB Australia S'pore vs ADB MH2218, MH2240 AARAG00 Stybarrow FOB Australia London Close MH2219, MH2260 AAXQC00 Asian Heavy Sweet Index S'pore Close MH2205, MH2206 AAPDP00 Asian Heavy Sweet Index S'pore vs ADB MH2205, MH2206 AAPDO00 Asian Heavy Sweet Index London Close MH2206, MH2260

AARAH03 Stybarrow FOB Australia S'pore Close MAvg AARAI03 Stybarrow FOB Australia S'pore vs ADB MAvg AARAG03 Stybarrow FOB Australia London Close MAvg AAXCQ03 Asian Heavy Sweet Index S'pore Close MAvg AAPDP03 Asian Heavy Sweet Index S'pore vs ADB MAvg AAPDO03 Asian Heavy Sweet Index London Close MAvg

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