西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (3): 83-88.

• 地质勘探 • Previous Articles     Next Articles

Extensional Tectonic Characteristics and its Sedimentary Response of Early-Middle Cambrian in Tarim Basin

GAO Zhi-qian 1 FAN Tai-liang 1 YIN Wei 2 ZHANG Xiao-long 3 WANG En-hui 4
  

  1. 1. MOE Key Laboratory of Marine Evolution and Hydrocardon Accumulation Mechanism, China University of Geosciences, Haidian, Beijing 100083, China;
    2. Research center of Mid-asia and Russia, Research Institute of Petroleum Exploration and Development, Haidian, Beijing 100083, China;
    3. Engineering and Technology Research Institute, Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063004, China;
    4. Research Institute of Exploration and Development, Liaohe Oilfield Company, CNPC, Panjin, Liaoning 124010, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-20 Published:2011-06-20

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Abstract: The half grabens and normal faults develop in the Lower-Middle Cambrian of Tazhong（central Tarim Basin）and Bachu area, Tarim Basin, which indicates that Tarim Basin may be of extensional tectonic setting during the Early-Middle Cambrian. The half grabens are distributed within a linear zone laterally and show vertical

succession, while the normal faults are arranged in echelon patterns and the fault throw increases gradually from west to east. Such extensional tectonics may be the result of intense stretch in connection with the formation of discrete continents. The formation of half grabens, associated with the formation of passive continental margin in the southwest and cratonic marginal depression in the east, especially is notably influenced by the development of trigeminal rift on the northeast margin of Tarim Basin. The fault system controls the sedimentary filling evolution
and framework which exhibits platform-slope-bathyal facies. The half grabens trend NW-SE, consistent with buried basement fault, and the lithology is limestone-dolomite-gypsum rock-saline rock-red layer sediments.

Key words:

passive continental margin, extensional tectonics, half graben, sedimentary framework, Tarim Basin

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