• Royal Dutch/Shell has acquired British oil explorer Enterprise Oil Plc for US$5.4 billion. • Marathon Oil Corp., Houston, has acquired Globex Energy Inc., Houston, adding 38 million BOE of proven reserves, primarily in Equatorial Guinea on the Alba Field. The assets also include a 12.5% interest in the Stag Field offshore Australia. Daily production from the fields is 6,200 BOE from Stag and 4,000 from the Alba. An additional 12 million BOE of proven • Vintage Petroleum Inc., Tulsa, Okla., has sold its holdings in Trinidad and Tobago to Vermilion Resources Ltd., Calgary, for approximately US$40 million. The assets are onshore in the Central Block portion of the Southern Basin. Proved reserves are 64.4 billion cu. ft. of gas and more than 1 million bbl. of condensate or 11.9 million BOE. • Pioneer Natural Resources Co., Dallas, plans to acquire Gulf Canada Tunisia Ltd.'s 40% participating interest in the 1.2-million-acre Borj El Khadra permit in the Ghadames Basin onshore southern Tunisia. Pioneer will join Agip Tunisia BV, the operator of the permit, and Paladin Expro Ltd. in exploring the permit. • Marathon Oil Co., Houston, subsidiary Marathon Petroleum Norge A/S acquired Norsk Hydro's interest in Norwegian production licenses 150 and 203. Marathon will be operator of license 203, its first operatorship on the Norwegian continental shelf. • Nicaragua will allow four oil consortia to bid on exploration licenses in the country. Empire Energy Corp., Overland Park. Kan., which owns 51% of Industria Oklahoma-Nicaragua SA, one of the four prequalified companies, is preparing to bid.