The Finance Secretary has promised to update figures on oil revenues after claims they were "inflated" to support the economic case for independence.

John Swinney said new figures will be published in the coming weeks.

He made the commitment during a Conservative-led debate on the Scottish Government's financial projections for the country after a Yes vote in the referendum.

"The Government intends to publish its third oil and gas analytical bulletin in the coming weeks which will set out the impact that recent developments in the North Sea have on the outlook for future production and revenues as a consequence," Mr Swinney told MSPs.

It will build on information in the Scottish Government's White Paper on independence, published last November, to extend projections beyond 2016-17, he said.

"Now that more data is available we will extend those projections over a number of years, building on the analysis in the White Paper and the central conclusions that Scotland is a wealthy country that will start life as an independent nation with great economic prospects," he added.

Mr Swinney was responding to Tory finance spokesman Gavin Brown who accused the SNP administration of using "highly questionable" figures.

Mr Brown said: "More and more analysts are challenging the assumptions made by the Scottish Government in its White Paper and in a number of other papers it has produced."

He also criticised the decision to put a single year's financial figures in the White Paper and pointed out that the Scottish Government is more optimistic than a range of independent analysts in predicting the country's likely deficit.

The Government says the deficit could be 3.2% but analysts, including Citigroup and the Institute for Fiscal Studies (IFS), place it at more than 5%, he told Parliament.

Oil projections are central to the Government's estimates, he said.

The Conservatives point to Scottish Government figures which put oil revenue as high as £7.9 billion in 2016, which could be the first year of independence. It compares with an estimate of about £3.2 billion from the Office for Budget Responsibility (OBR), set up by the UK Government.

Mr Brown said: "This means we have a £4 billion black hole between what the OBR are saying and what the Scottish Government claims will be the case."

The debate comes a week after Scottish Tory leader Ruth Davidson pressed Alex Salmond on oil figures during First Minister's Questions at Holyrood.

Referring to OBR figures, she said receipts will fall by almost 50% in four years, going from £6.1 billion in 2012-13 to £3.2 billion in 2016-17.

Mr Salmond said the Scottish Government figures are based on oil at 113 US dollars a barrel, compared with other predictions going as high as 140 US dollars by the end of the decade.

"There's a reasonable case to be made that this is not an over ambitious forecast but a rather sensible one,'' he told her.

Mr Brown said history suggests the Scottish Government has not always been "robust".

Figures for 2012-13 show the administration had predicted the Scottish share of oil revenues would be £6.9 billion.

"The actual Scottish share was £5.6 billion," Mr Brown said.

"The Scottish Government were out by £1.3 billion, yet the First Minister says the figures we have are robust.

"What makes the mistake even worse is that the Scottish Government made this prediction in March 2013. There was only a month to go to the year end of the oil revenues actually coming in but they still managed to misjudge it by well over £1 billion."

Mr Swinney said the UK Government is cutting the Scottish budget and there are billions of pounds of cuts to come.

He also questioned the OBR's track record, saying growth has undershot the forecasts in each of the past three years.

Official figures show tax revenues for 2012-13 were £800 higher per head in Scotland than the UK as a whole, he said.

"That means that in every one of the last 33 years, tax receipts have been higher in Scotland than the UK," he told MSPs.

"Over the past five years, Scotland's public finances have been healthier than the UK's by a total of £8.3 billion - that's the equivalent of nearly £1,600 per person.

"And our higher tax receipts mean that Scotland's spending on social protection benefits, including pensions, is more affordable."