Conglomerate characteristics and alluvial fan evolution of the Triassic Lower Karamay Formation in Karamay Oilfield,Junggar Basin

doi:10.7605/gdlxb.2015.02.013

Abstract

Abstract:

Based on core observation,five types of conglomerates are divided in the Triassic Lower Karamay Formation,Karamay Oilfield,i.e., the matrix-supported breccias,weak-cemented conglomerates(strictly speaking,this type is still uncemented),mud-supported conglomerates,sand-supported conglomerates and well sorted granule-conglomerates. Compared to the sediments of modern alluvial fans,the depositional environment of each conglomerate in the Lower Karamay Formation can be determined as following:in the early stage,due to all arid climate,the conglomerates have similar characteristics to that of modern arid alluvial fans in Zaier Mountain area. However,in the late stage a humid climate prevailed, and the fluvial process become dominant, with the deposited conglomerates showing similar characteristics to that of Baiyanghe alluvial fans in Fukang. So,vertically,the alluvial fans showed a retrogradational sequence towards the ancient Zaier Mountain.

Key words: Karamay Oilfield, Triassic, Lower Karamay Formation, alluvial fans, conglomerates

摘要：

通过岩心观察,将克拉玛依油田三叠系克下组砾岩分为杂基支撑角砾岩(砾石成分同基岩)、弱胶结砾岩(严格意义上未胶结成岩)、泥质杂基支撑砾岩、砂砾质支撑砾岩和分选极好的细砾岩几种类型。通过岩心岩石特征与现代洪积扇沉积物特征对比,确定了每一类砾岩的形成环境。克下组沉积早期,气候干旱,洪积扇为干旱型,可与现代扎伊尔山山麓洪积扇(堆)沉积物特征相类比。克下组沉积后期气候变得潮湿,洪积扇类型逐渐转变为以河流作用为主,可与阜康市白杨河洪积扇沉积物特征相类比。克下组洪积扇在垂向上为向扎伊尔山后退的沉积序列。

关键词: 克拉玛依油田, 三叠系, 克下组, 洪积扇, 砾岩

CLC Number:

P512.2

Yu Kuanhong, Jin Zhenkui, Li Guizai, He Miao, Guo Xiujuan, Yang Ting. Conglomerate characteristics and alluvial fan evolution of the Triassic Lower Karamay Formation in Karamay Oilfield,Junggar Basin[J]. JOPC, 2015, 17(2): 143-159.

余宽宏,金振奎,李桂仔,何苗,郭秀娟,杨婷. 准噶尔盆地克拉玛依油田三叠系克下组洪积砾岩特征及洪积扇演化[J]. 古地理学报, 2015, 17(2): 143-159.

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URL: http://www.gdlxb.cn/EN/10.7605/gdlxb.2015.02.013

http://www.gdlxb.cn/EN/Y2015/V17/I2/143

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