(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 UN01.DE deliberately obstructed Fortum's proposed purchase of a stake in the German utility by registering assets in Russia as strategic, Kommersant daily quoted Fortum FORTUM.HE CEO Pekka Lundmark as saying. Bulgaria's competition regulator on Thursday blocked insurance and financial group Eurohold's 4EH.BB acquisition of the Bulgarian assets of Czech utility CEZ CEZP.PR , 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 ENI.MI has bought 70% of Edison's EDNn.MI 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 IREE.MI 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 CSV.AX said it received an offer from Japan's Fuji Xerox (NYSE:XRX) 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.