PRELIMINARY ANALYSIS ON THE DISTRIBUTION PATTERNS OF COAL SEAMS IN THE JURASSIC SYSTEM OF THE NOKTH SONGLIAO BASIN

The Shahezi Formation of Jurassic system the main coalg-athering position of the North Songliao Basin,The environment of stable tectonic movement is advantageotis to the generation of thicker coal seams.Coal seams are mainly distributed in the eastern block-rolling area.And coal-gathering environment is dominated by fluviolacustrine deltas.So the reflecting features and distribtition ranges of coal seams can be determined by means of seismic data.