Sedimentary Characteristics of Jurassic Kalazha Formation in the Thrust Belt on the Southern Margin of Junggar Basin

doi:10.7657/XJPG20210401

Abstract

Abstract:

In order to clarify the characteristics of deep reservoirs in the thrust belt on the southern margin of the Junggar basin, the markers, types, distribution and models of sedimentary facies and source directions of the Jurassic Kalazha formation were analyzed based on the data of outcrops, mud logging, trace elements and heavy minerals. The result shows that the sedimentary facies of alluvial fan and braided river delta are mainly developed in Kalaza formation. Laterally three large sedimentary systems are distributed from west to east, which are the alluvial fan-braided river delta in the middle section of the Qigu fault-fold belt, the braided river delta in the Toutunhe area in the eastern section of the Qigu fault-fold belt, and the braided river delta in the Fukang fault belt. Vertically, there are four sedimentary cycles which follow a prograding sequence. The types and planar distribution of the sedimentary facies are mainly controlled by the activities of the Tianshan orogenic belt during the late Jurassic period. Sandstone reservoirs of more than 200 m thick are developed on the three large sedimentary systems. Especially, the sandstone reservoirs in the braided river delta front are very sortable, thick and widely distributed, which match well with the deep large anticline and can be favorable exploration targets.

Key words: Junggar basin, thrust belt of the southern margin, Jurassic, Kalazha formation, alluvial fan, braided river delta, sedimentary facies, sedimentary model

CLC Number:

TE121.3

SI Xueqiang, YUAN Bo, PENG Bo, JI Dongsheng, GUO Huajun, TANG Xueying, DOU Yang, LI Yazhe. Sedimentary Characteristics of Jurassic Kalazha Formation in the Thrust Belt on the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(4): 389-398.

Figures/Tables 8

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