Sedimentary Facies and Controlling Factors of Shengjinkou Formation in Chepaizi Swell

doi:10.7657/XJPG20210102

Abstract

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

CLC Number:

TE121.3

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.

Figures/Tables 14

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