Abstract:

Source rock is mainly distributed in three series of strata in Cambrian-Ordovician in Tarim Basin, i.e. carbonate source rock and mud source rock in Middle-Low Cambrian, mud source rock in Middle-Lower Ordovician-Upper Cambrian, platform margin lime-mud mound source rock in Upper Ordovician. The development of source rock is controlled by eustatic sea level change in vertical direction, and dominated by facies and palaeowater depth in plane The mud source rock is mainly formed in continental shelf-deep basin. Mud source rock in deep-sea basin is due to lots of lethal bionts in surface waters which is accumulated in deep water environment. Because of absent oxygen and low aggradation rate in deep water, organic matter is prone to be kept The mud source rock in open-sea continental shelf is related with the function of ascent ocean current. The carbonate source rock is controlled by system tracts and facies.The carbonate source rock is mainly developed in high system tract in low ramp or is survived with gypsum-salt rock together.

Key words: Tarim Basin, source rock, high frequency sequence, system tract, development pattern