西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (4): 1-12.

• 地质勘探 •     Next Articles

Outcrop Sequence Stratigraphy of the Ordovician in Xishui，Guizhou

Liu Zhicheng1, Zhang Tingshan1, Wanyan Qiqi1，2, Yang Yang3, Yang Wei1   

  1. 1. School of Resources and Environment，Southwest Petroleum University，Chengdu，Sichuan 610500，China2. PetroChina Exploration & Development Research Institute–Langfang，Langfang，Hebei 065007，China3. Shunan Gas District of Southwest Oil and Gas Company，PetroChina，Luzhou，Sichuan 646000，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-08-01 Published:2012-08-01

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Abstract: According to the outcrop and the analyses of the carbon and oxygen isotopes，this paper discusses the identified
stratigraphic sequence surfaces and the response of carbon and oxygen isotopes for the Ordovician formation of Xishui Region
in Guizhou Prvince，and carbon and oxygen isotopes. The result shows the Ordovician system can be divided six three-order
sequences，which include two I-type and two II-type and two III-type sequence surfaces. In the third-order stratigraphic sequence，
13C in system of the advance of sea and the high water level displays trends of increase and decrease respectively. The
responses of carbon and oxygen isotope can effectively reflect the stacking patterns of parasequences form forth order sequence.
Meter-scale cycle has developed two modes in this area during Ordovician period：one is L–M meter-scale cycle type，and the
other is Subtidal meter-scale cycle type.

Key words: sequence stratigraphy, system tract, Carbon and Oxygen isotopes, Ordovician, Xishui Region

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