TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The first synthesis gas feed is converted to paraffinic hydrocarbons, preferably an oxygenate as first organic product and oxygenates and/or olefinic hydrocarbons as first by-product. The second synthesis gas feed is converted to olefinic hydrocarbons as second organic product and oxygenates and/or paraffinic hydrocarbons as second by-product. It is converted to an oxygenate as second organic product and another oxygenate as second by-product. The step of converting the first and second synthesis gases are under conditions of a carbon monoxide conversion of Xi and Xii and a molar usage ratio of hydrogen to carbon monoxide of Fi and Fii, where Fi is greater and less than F, respectively. The two stages are effected under such conditions that the relationship, F = Xi.Fi+Xii.Fii+c (I), where c is up to 0.2, is met.Preferred Product: The general structural formulae of the two organic products are olefins, paraffins, alkanols, aldehydes, or ketones.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Gas: The synthesis gas comprises a mixture of hydrogen and carbon monoxide, and has a molar ratio of hydrogen to carbon monoxide of F. EXAMPLE - A synthesis gas was prepared by partial oxidation of natural gas at 1200 degreesC in the presence of oxygen (O2) at O2/methane (CH4) ratio of 0.6, and having a hydrogen (H2) to carbon monoxide (CO) molar ratio of 1.7. The synthesis gas was mixed with recycle synthesis gas to produce a synthesis gas feed having a H2 to CO molar ratio of 1.1. The synthesis gas feed was introduced in a heavy paraffin synthesis reactor (HPS reactor) at a gas hourly space velocity (GHSV) of 800 Nl/l/h. The reactor contained a Fischer-Tropsch catalyst comprising 18 pbw cobalt/100 pbw silica carrier. The synthesis gas was contacted with the catalyst at 220 degreesC and a pressure of 2.8 MPa. The H2 to CO usage ratio F1 is 2.1. The process was operated to reach an overall CO conversion Xi of 0.75. The process produced paraffins and olefins (wt.%), according to length of carbon chain, 1C (5.5, 0); 2C (0.4, 0.1); 3C (0.5, 1.5); 4C (0.5, 1.5); 5-9C (15.0, not separated); 10C (75.0, not separated), respectively.