Genesis and Distribution of Shallow Conglomerates in the Southern Margin of Junggar Basin

doi:10.7657/XJPG20200111

Abstract

Abstract:

The hugely thick conglomerates are widely developed in the shallow layers of the southern margin of Junggar basin, which leads to the poor seismic imaging quality of the shallow layers and the difficulties in accurate determination of the structural high and configuration of the underlying target zone. Based on the analysis of the structure, sedimentary evoluation and ancient landform in the southern margin of Junggar basin since Neogene, the paper identifies the geological framework, establishes the genetic model and determines the distribution of the conglomerate layer. The study shows that the conglomerate in the southern margin of Junggar basin can be divided into low-speed conglomerate and high-speed conglomerate vertically. A geological genetic model of “segmented by the ancient swell horizontally, multistage fan overlapping and progradation in the early period and rapid accumulation in the late period vertically” is established, which was controlled by multistage tectonic movements, paleostructure and sediment supply during the Himalayan period. The conglomerate layer is segmented by the ancient Chepaizi swell, where 2 alluvial fan groups are developed in the east and west, respectively and can be further divided into 5 alluvial fans. The conglomerate layer is thick in the south and thin in the north, among which the high-speed conglomerate is relatively thick and low-speed conglomerate is relatively thin. The eastern alluvial fan group is controlled by 3 rows of positive tectonics and 3 N-S trending conglomerate belts are developed in the eastern fan group.

Key words: Junggar basin, shallow layer, low-speed conglomerate interval, high-speed conglomerate interval, genetic model, distribution

CLC Number:

P631.443

DENG Yong, CHEN Peng, ZHANG Xin, ZHOU Zhisong, TIAN Chenxi, LIU Yahui, ZENG Xiaolan. Genesis and Distribution of Shallow Conglomerates in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 93-99.

Figures/Tables 9

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