西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (5): 31-41.

• 地质勘探 • Previous Articles     Next Articles

High–frequency Base Level Cycle Sequence Feature for the UpperMember of the Lower Ganchaigou Formation of Well Jian1 inNorthwestern Qaidam Basin

Pei Mingli1，2, Wang Hua1, Chen Yan3, Cao Zhenglin2, Lei Guang3   

  1. 1. Faculty of Resources，China University of Geosciences，Wuhan，Hubei 430074，China2. Northwest Branch，Research Institute of Exploration & Development，PetroChina，Lanzhou，Gansu 730020，China3. Research Institute of Petroleum Exploration and Development，Qinghai Oilfield Company，PetroChina，Dunhuang，Gansu 736202，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-10-01 Published:2012-10-01

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Abstract: According to sedimentary features of Tertiary saline lake of Qaidamu Basin，shore–shallow lake sedimentary pattern
for the upper member of the lower Ganchaigou Formation（E23
）of Well Jian1 was established. Based on the summary about
characteristic of seven types of microfacies for beach–bar sedimentary region，two kinds of assembled system for shore–shallow
lake sedimentary microfacies are concluded，separately corresponding with lake–level movement two–period of lake–level
rising to highstand and lake–level falling to lowstand. By applying of the high resolution sequence stratigraphic theory and
method about terrene and construction of the basic base level cycle pattern，69 short period cycles or 4 middle period cycles
or 2 long period cycles for the upper member of the lower Ganchaigou Formation of Well Jian1 are built up. By analyzing
the genesis and feature of the high–frequency base level cycle sequences，the significance of carbonate sedimentary under
lacustrine environment in study of the high resolution sequence stratigraphy is further discussed. The results of research in this
study may deliver important geological information for the basic feature of the sequence stratigraphy under the arid environments
of Paleogene System in Qaidam Basin.

Key words: northwestern Qaidam Basin, Well Jian1, the upper member of the lower Ganchaigou Formation, shore-shallowlake sedimentary microfacies, high-frequency base level cycle sequence