(Adds Audiotechnik, Eurohold, Fortum, Kerogen Capital)
Oct 24 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2000 GMT on Thursday:
** Private-equity firm Kerogen Capital is seeking offers for its North Sea business Zennor Petroleum from a select number of bidders with the help of U.S. investment bank Citi, industry sources said.
** Uniper deliberately obstructed Fortum's proposed purchase of a stake in the German utility by registering assets in Russia as strategic, Kommersant daily quoted Fortum CEO Pekka Lundmark as saying.
** Bulgaria's competition regulator on Thursday blocked insurance and financial group Eurohold's acquisition of the Bulgarian assets of Czech utility CEZ, saying the 335 million euro deal could hinder competition.
** Buyout group Ardian is preparing the sale of d&b Audiotechnik in a deal that may value the German professional loudspeaker maker at more than 600 million euros ($667 million), people close to the matter said.
** Italy-based energy company Eni has bought 70% of Edison's stake in Block 12 of the offshore Habi gas concession in Egypt's eastern Mediterranean, an official at state-owned Egyptian gas company EGAS said.
** Italy-based utility company IREN will submit a non-binding offer for the assets of waste management company Unieco Holding Ambiente, the chief executive of IREN said.
** Printing and technology services provider CSG Ltd said it received an offer from Japan's Fuji Xerox Co worth A$139.3 million ($95.46 million).
** Banking firm Rothschild struck its second British takeover deal within months with the acquisition of boutique financial advisory firm Livingstone. (Compiled by Arundhati Sarkar and C Nivedita in Bengaluru)