Terminal fan sedimentary system of Lulehe Formation in Qianxi area in northern margin of Qaidam Basin
Online published: 2010-12-15
The climate of the Qaidam Basin was arid to semiarid at the Cenozoic, and the strata deposits mainly are terrigenous clastics. Based on the core observation, the lithology, rock texture, sedimentary structure and the exposure evidence of Lulehe Formation are analyzed. Combined with well log analyses, it is believed that the sedimentary system of Lulehe Formation is terminal fan which formed in arid to semiarid regions. The model includes a tripartite zonation of terminal fan into feeder zone, distributary zone and basinal zone. The distributary zone mainly consists of distributary channel deposit, flood plain deposit, overbank deposit and sheet flood deposit. Feeder and distributary zone are the main deposition in Qianxi area. The subfacies distribution is analyzed and the sedimentary facies model is established. The relationship between subfacies and reservoir development is discussed and the distributary zone is the most favorable subfacies for reservoir development.
Key words: marine source rocks; log response; organic matter abundance; Ordovician; TarimBasin
LEI Tao , ZHOU Wen , YANG Yi , DENG Hucheng , ZHANG Guanghui , ZHAO Ankun . Terminal fan sedimentary system of Lulehe Formation in Qianxi area in northern margin of Qaidam Basin[J]. Lithologic Reservoirs, 2010 , 22(4) : 37 -42 . DOI: 10.3969/j.issn.1673-8926.2010.04.007
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