Title: Mesozoic-Cenozoic Sequence Framework and Sandstone Predication Model in Chepaizi Area,Western Junggar Basin
Abstract: Special sequence stratigraphic framework formed in the foreland basin due to its unique tectonic and sedimentary background.In this paper,the sequence patterns in orogenic front uplift belt are discussed taking an example of the Chepaizi area,western Junggar basin.Five key chronohorizons are identified in Mesozoic-Cenozoic sedimentary intervals(Tugulu Group of Lower Crataceous,Anjihaihe Group of Paleogene,Shawan Group and Taxihe Group of Neogene)in the study area.According to the features and orders of the sequence boundaries,two first-order sequences,three second-order sequences and four third-order sequences are divided.Controlled by the special orogenic front uplift slope depositional setting in foreland basin and multiple episodic thrusting processes,the Mesozoic-Cenozoic sequences show two contrasting segments of sequence architecture with only lowstand system tract and transgressive system tract in the Chepaizi area.Coarser grain deposits developed in lowstand system tract during thrusting period,and finer grain deposits developed in transgressive system tract during tectonic relaxing period.The lowstand incised valleys,large scale fan deltas and transgressive beach sandbars are the mainly favorable reservoir rocks and exploration targets.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 1
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