Due to the importance of the marine source rocks to the exploration in the Tarim Basin, this paper present a new distribution of the Cambrian source rocks distribution based on the study of tectonic-paleogeography, geochemitry of typical wells and new seismic data. It is shown that the source rocks are mainly mudstones and shales from the Middle-Lower Cambrian in the eastern Tarim and from the Lower Cambrian in the western Tarim. However, the source rocks are sparse in the Lower Paleozoic carbonate rocks. With logging calibration, the source rocks thickness is less than 100 m and 40 m in the eastern and western Tarim, respectively. By the seismic data interpretation, the Cambrian source rock distribution is not full of the basin, but mainly distributed in three areas of the Mandong and Manxi Depressions, and southwestern margin of the Tarim, while sparse source rocks in basement uplifts. Controlled by Precambrian palaeo-uplift and weak extension in the Cambrian Tarim, the source rocks are mainly developed in four tectonic setting：inter-platform basin and inner-platform depression, and the possibly passive margin slope and plate margin rift.
Han Jianfa Wu Guanghui Xiao Zhongyao Su Zhou Zhang Liping Li Honghui. Recognition of the distribution of Cambrian source rocks and its significance for exploration in Tarim Basin[J]. Chinese Journal of Geology, 2020, 55(1): 17-29.