This is rather complex. But here are some basic observations. Pretribulationalists are always futurists, but not all futurists are pretribulationalists. Posttribulationalists are usually futurists. Historicists are usually posttribulationalists.
Partial preterists are posttribulationalists.
Full preterists are usually amillennialists. All pretribulationalists are dispensationalists. Some posttribulationalists are dispensationalists. All dispensationalists believe the 70th week is future. All pretribulationalists believe the 70th week is future.