期刊
GLOBAL AND PLANETARY CHANGE
卷 205, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.gloplacha.2021.103612
关键词
Neoproterozoic; Lower Cambrian; Ediacaran; Black shale; Tarim Basin
资金
- National Natural Science Foundation of China [41902158, 42073068]
- National Science and Technology Major Project [2016ZX05004-004]
This study integrated different data to analyze the tectonic-sedimentary evolution of the Tarim Basin and its impact on the distribution of Lower Cambrian source rocks. The spatial distribution of the Lower Cambrian source rocks was controlled by the paleo-topography of the late Ediacaran basin, with black siliceous shales showing excellent petroleum potential in the northern region.
Lower Cambrian black shales contain unique metazoan fossils that record the origins and diversification of early animals, and are also important hydrocarbon source rocks with a global distribution. The spatial distribution and hydrocarbon potential of Lower Cambrian black shales in the Tarim Basin, northwest China, are still poorly constrained due to deep burial and the few previous studies of these rocks. In this study, we integrated outcrop, seismic, and drilling data in order to examine the tectonic-sedimentary evolution of the Tarim Basin from the late Ediacaran to Early Cambrian, and its effects on the distribution of Lower Cambrian source rocks. During rifting related to breakup of the Rodinia supercontinent, the Tarim Basin was filled with clastic rocks of Cryogenian to early Ediacaran age. Post-rift carbonates interbedded with siliceous and argillaceous sediments were then deposited during a widespread transgression in the late Ediacaran-Early Cambrian. The Tarim Basin can be subdivided into northern and southern parts by a central paleo-uplift region that had a high paleo-topography. Although tectonism at the end-Ediacaran is variably recorded in some outcrops and by seismic data, the Tarim Basin did not experience a change in its tectonic and sedimentary framework at this time, indicating it inherited the structure of the Early Cambrian and late Ediacaran basins. Therefore, the spatial distribution of the Lower Cambrian source rocks was controlled by the paleo-topography of the late Ediacaran basin, and these source rocks can be divided into three members. Black siliceous shales are one of the most productive source rocks in the Tarim Basin, are widely distributed in the northern Tarim Basin, and have excellent petroleum potential.
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