Abstract: Hydro-pyioiysis experiment was made with low mature source rock (Triassic) in Luranan area of Tarim basin. Results showed that greater changes occurred for its distribution parameters ot saturated hydrocarbon ollipared with that of originai source rock. The percentage of isoalkane increased in pyroiysed sampies, distribution range of carbonriumber of norrnai aikane moved forward for samples added with montmorilonite. Conspicuously, Prisane predominace in extracts of source rock was changed into that of phytane following pyrolysis.

Key words: Source tock, Hydro-pyrolysis, Normal alkane, Isoalkane, Pristane/phytane ratio