LA LAND <LLX>,DU PONT <DD>GET EXPLORATION TRACTS Louisiana Land and Exploration Co said it, Du Pont Co's Conoco Inc subsidiary and <Oranje-Nassau Energie B.V.> have been offered four exploration blocks offshore The Netherlands. Louisiana Land said Blocks Q4a, E12c and E15b were offered to the group in which Conoco has a 67.5 pct interest, Louisiana Land 20 pct and Orange-Nassau 12.5 pct, while this group along with a consortium headed by Pennzoil Co <PZL> were offered Block Q5c. The offers were the result of applications submitted to the Ministry of Economic Affairs for the Netherlands Sixth Offshore Licensing Round. Louisiana Land said the Conoco group intends to provide a formal acceptance of the blocks with plans to start exploration this year. The company also said the two Q blocks immediately offset other offshore blocks on which hydrocarbons have been found in commercial quantities.