车排子凸起胜金口组沉积相及主控因素

doi:10.7657/XJPG20210102

摘要/Abstract

摘要：

根据微量元素分析,恢复了准噶尔盆地车排子凸起下白垩统胜金口组的沉积环境,综合钻井、测井、地震以及分析化验资料,对比分析了胜金口组扇三角洲和辫状河三角洲的沉积特征,通过古地貌恢复,明确了车排子凸起扇三角洲与辫状河三角洲分布的控制因素。结果表明,车排子凸起胜金口组沉积时期为干热气候背景下富氧的淡水—半咸水沉积环境,古水体温度为27.3~29.2 ℃;胜金口组发育有扇三角洲—湖泊和辫状河三角洲—湖泊2种沉积体系。在胜金口组沉积时期,车排子凸起的西南部发育多个扇三角洲朵体,东部发育辫状河三角洲朵体。搬运通道、距物源远近及地形坡度是影响车排子凸起形成2种类型三角洲的主要因素。

关键词: 准噶尔盆地, 车排子凸起, 胜金口组, 沉积相, 扇三角洲, 辫状河三角洲, 搬运通道, 地形坡度

Abstract:

In Chepaizi swell of the Junggar basin, the sedimentary paleo-environment of the Lower Cretaceous Shengjinkou formation was restored according to the analysis of trace elements; the sedimentary characteristics of fan delta and braided river delta in the formation were compared and analyzed using drilling, logging, seismic and laboratory data; and the controlling factors on the distribution of the fan delta and braided river delta were determined after restoring the paleogeomorphology of the Shengjinkou formation. The result shows: (1) when the Cretaceous Shengjinkou formation deposited, Chepaizi swell was in oxygen-rich freshwater to brackish water environment under dry and hot climate, and the paleo-water temperature ranged from 27.3 ℃ to 29.2 ℃; (2) there were two sedimentary systems such as fan delta-lake and braided river delta-lake in the Shengjinkou formation; and several fan delta lobes were developed in the southwest of the study area, and many braided river delta lobes in the eastern regions. Transport channels, distance from sources and terrain slope are factors controlling the development of two types of deltas in the study area.

Key words: Junggar basin, Chepaizi swell, Shengjinkou formation, sedimentary facies, fan delta, braided river delta, transport channel, ter- rain slope

中图分类号:

TE121.3

朱颜, 李艳然, 岳欣欣, 张辉, 李恒权, 张弛, 张新超. 车排子凸起胜金口组沉积相及主控因素[J]. 新疆石油地质, 2021, 42(1): 10-11.

ZHU Yan, LI Yanran, YUE Xinxin, ZHANG Hui, LI Hengquan, ZHANG Chi, ZHANG Xinchao. Sedimentary Facies and Controlling Factors of Shengjinkou Formation in Chepaizi Swell[J]. Xinjiang Petroleum Geology, 2021, 42(1): 10-11.

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