Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1310-1321.doi: 10.13278/j.cnki.jjuese.201505105

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Characteristics of Mixed Sedimentations and Diagenesis of Terrigenous Clastic Rock and Carbonate:The Middle Jurassic in the East Qiangtang Basin, Tibet, China

Ma Boyong1, Wang Genhou2, Li Shanglin3, Xu Hongyan1   

  1. 1. China Geological Survey, Beijing 100037, China;
    2. College of Geoscience and Mineral Resources, China University of Geosciences, Beijing 100083, China;
    3. Xi'an Center of China Geological Survey, China
  • Received:2014-02-21 Published:2015-09-26

Abstract:

Geological researchers have paid more and more attention to the mixed siliciclastic carbonate sediments and its geological significance of oil and gas. Qiangtang basin is one of the most important strategic selection for oil and gas exploration. The mixed siliciclastic carbonate sediments are extensively developed in the eastern part of Qiangtang basin. Combined the regional geological data and indoor sample analysis with the previous researches, we study the characteristics of the mixed sediments, their sedimentary environment, and their diagenesis. The results show that the research area is characterized by interactive sediments of terrigenous clast and carbonate on the microscopic level, so called "mixed rock", and by interbedded rocks of terrigenous clastic rock, carbonate rock or mixed rock in macro. These lithoface types are mainly formed in a sedimentary environment of shore, carbonate ramp, or tidal flat-lagoon. It can be divided into four three-level sequences, which remarkably improves the precision of stratigraphic classification. The lithofacies palaeogeography of Quemocuo, Buqu and Xiali age are established. The diagenesis types of the mixed rocks are cementation, compaction, pressure solution, fragmentation, and dissolution. The pressure solution, fragmentation and dissolution are more common than others, which are conducive to form a mixed rock reservoir. This research can provide valuable information for petroleum and natural gas exploration.

Key words: carbonate rock, terrigenous clastic rock, mixed sedimentation, diagenesis, oil and gas, Middle Jurassic, Qiangtang basin

CLC Number: 

  • P618.13

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