COAL-GENERATED OIL IN TUHA BASIN

The Turpan-Harmi (abbreviated to Tuha below) Basin is a typical basin of coal-generated oil accumulation in China. The Middle-Lower Jurassic coal measures are considered the main source beds. Hence, both desmoc ollinite and suberinite are considered the contributors for coal-gener ated oil. Principal geochemical features of the crude oil in the Tuha Basin are rich in alkanes (70%-80%), high pristane/phytane ratio (6-8) , abundant heavy carbon isotope (delta(13)C PDB= -26 parts per thousan d- -23 parts per thousand) and absolute C-29 sterane predominance. The hydrocarbon generation process from the coal series is characterized by multistages, early generation and early expulsion.