柴达木盆地七个泉组和第四系-新近系的分界

doi:10.11743/ogg20060319

Abstract

Abstract:

Three gas fields sourced from Pliocene-Quaternary Qigequan Formation have been found in Sanhu depression in southeastern Qaidam basin.It is a misunderstanding to take the base of Qigequan Formation in Sanhu depression as the boundary of Quaternary and Neogene.Based on logging,seismic stratigraphic and magnetobiostratigraphic studies,the age of the base of Qigequan Formation in Sanhu depression is believed to be 2.80 Ma,it is at a depth of 1 747 m in Xinshen 1 well drilled in Sebei area.There are three different opinions on the Quaternary-Neogene boundary in Qaidam basin in literatures.①The end of Olduvai,1.67 Ma,(1.80 Ma); it is at a depth of 710 m in Sezhong 6 well,i.e.19 m above the log-marker K₃.②The boundary of Matsuyama and Gauss, 2.48 Ma(2.60 Ma);it is at a depth of 1460 m deep in Seshen 1 well,i.e.37 m below the log-marker K₁₀.③The end of Mammoth,3.05 Ma;it is 2 779 m deep in Dacan 1 well.None of the above three boundaries correlates with the base of Qigequan Formation.The definition of Quaternary-Neogene boundary,with an age of 1.80 Ma,has been adopted by the International Commission on Stratigraphy(ICS) through voting in 1998,and accepted by the International Union of Geological Sciences(IUGS) in 1999.According to this definition,most of the gas source rocks in Sanhu depression were deposited during Late Neogene to Early Quaternary,especially in Pliocene.It is suggested in this paper that the stratigraphic unit name of Qigequan Formation rather than the symbol "Q₁₊₂" should be used in petroleum exploration and development research in Qaidam basin.Correlation of the seismic reflector T₀(log-marker K₁₃) and the base of Qigequan Formation with local unconformities at the edge of the basin is very useful for study of tectonic movement,gas generation and reservoiring. As the base of Qigequan Formation,the correlation of seismic reflector T₀ is characterized by practicability,isochroneity and operability in central Sanhu depression in Qaidam basin.

Key words: magnetobiostratigraphy, seismic reflector, unconformity, Quaternary, Qaidam basin

CLC Number:

TE111.3

Sun Zhencheng, Qiao Zizhen, Jing Mingchang, Zhang Haiquan, Sun Naida, Lu Yanli, Wang Hongjiang. Qigequan Formation and Quaternary-Neogene boundary in Qaidam basin[J]. Oil & Gas Geology, 2006, 27(3): 422-432.

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Qigequan Formation and Quaternary-Neogene boundary in Qaidam basin

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