Braided River Depositional Characteristics of the Triassic Lower Karamay Formation at Hongshanzui, Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2021.054

Abstract

Abstract:

In order to unravel the sedimentary facies and characteristics of the Triassic Lower Karamay Formation in the Hongshanzui area, we integrated core and well logging, thin section, and grain-size data, and conducted various analyses on the petrological features, core sedimentary structures, lithofacies division, and vertical sequence to study the sedimentary environment and sequence. The results show that the conglomerate, coarse sandstone, and silty mudstone are the main rock types, with low maturity and large grain-size range. Eight typical lithofacies and three lithofacies assemblages were summarized. Braided river sedimentation was recognized in the Lower Karamay Formation, with its microfacies including: braided channel, mid-channel bar, overflow sand, and floodplain. Sedimentary model of the Lower Karamay Formation is featured by being source-proximal, flood-controlled with intermittent strong current. Our new model provides reference for the Lower Karamay Formation reservoir research in the district.

Key words: depositional characteristics, lithofacies assemblage, braided river, Lower Karamay Formation, Hongshanzui area

CLC Number:

TE121.3

WANG Jin, YU Xinghe, ZHONG Yufang, ZHOU Ming, YANG Xintao. Braided River Depositional Characteristics of the Triassic Lower Karamay Formation at Hongshanzui, Junggar Basin[J]. Geoscience, 2021, 35(03): 841-849.

Figures/Tables 11

Fig.1 Location and regional paleogeomorphology of the study area and Triassic stratigraphic column

Fig.2 Reservoir rock types of the Lower Karamay Formation

Fig.3 Ternary diagram for the detrital composition of the Lower Karamay Formation

Fig.4 Grain-size probability plot of the Lower Karamay Formation

Fig.5 Typical sedimentary features of the Lower Karamay Formation

Table 1 Typical lithofacies of the Lower Karamay Formation in the study area

Fig.6 Typical lithofacies associations of the Lower Karamay Formation in the study area

Fig.7 Microfacies log response of the Lower Karamay Formation

Fig.8 Distribution of sandstone (a) and sedimentary microfacies in braided river (rising half cycle of MSC1) (b)of the Lower Karamay Formation in the study area

Fig.9 Braided-river sedimentary facies profile of the Lower Karamay Formation in study area

Fig.10 Braided-river depositional model of the Lower Karamay Formation in the Hongshanzui area

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