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UK North Sea asset sales stall as money goes elsewhere

* Opportunities in other parts of globe more attractive

* Bigger packages have limited number of potential buyers

* U.S. firms see better return on capital from shale

By Claire Milhench

LONDON, Oct 10 (Reuters) - A lack of buyers willing and able to take on ageing oil rigs in Britain's North Sea has stalled deal flow this year, creating a headache for North American firms who are under pressure from shareholders to sell.

Marathon, Conoco and Talisman have all put North Sea assets on the block, but the bigger packages are slow to change hands due to wrangling over decommissioning costs, financing problems for smaller buyers, and the fact that some rigs have very little time left on the clock.

In the first three quarters of 2014 there were only 19 deals in the offshore UK market, compared with 63 for the whole of 2013, according to data from Deloitte.

Just four deals were announced in the third quarter, although large packages continued to come to market including Conoco's 24 percent stake in the Clair oilfield.

"Everyone is cutting costs, cutting capital expenditure, trying to sell down assets at the same time and there is a paucity of buyers," said Stephen Murray, a partner at law firm Herbert Smith Freehills. "The balance between sellers and buyers is out of kilter."

"It's a buyers' market for exploration and development projects," agreed Jon Clark, a partner at Ernst & Young. "They can be relatively choosy."

The smaller, non-operated stakes are still able to find buyers, with Premier selling stakes in three fields to Hungary's MOL in the summer, but the bigger, more complex assets are a problem to get away.

This is partly because previously active buyers with deep pockets, such as the Chinese, have tightened the purse strings.

It is also a reflection of the fact that the North Sea is seen as less attractive when compared with other opportunities around the globe in Mexico, South East Asia and Africa.

"Sellers in the North Sea have to recognise that it is competing for capital with other parts of the world that have some attractive stories at the moment," said Neil Leppard, a director at PWC.

Another stumbling block is that the bigger packages tend to come with an operatorship, limiting the number of buyers. "Some groups simply want a non-operated stake," said Drew Stevenson, head of PWC's UK Oil and Gas Transaction Services team.

For the older assets, pricing and financing decommissioning is still a problem, with transactions failing to complete because parties cannot agree on how this burden will be shared.

Would-be buyers, particularly small independents, tend to look for something that is "decommissioning light" because banks and oil majors want them to stump up large amounts of security to cover abandonment liabilities.