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Sedimentary facies of the Triassic Lower Karamay Formation of Xia 77 area in northwest margin of Junggar Basin
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Chao DING1, Chunming LIN2, Jun LIU1, Weihang WEI2, Guyue TAN2, Xia ZHANG2, Shuya HUANG2, Xiaolong LIU1, Zhen CHEN1, Sutian WANG1
Journal of Palaeogeography (Chinese Edition) | 2026, 28(1) : 127 - 145
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Journal of Palaeogeography (Chinese Edition) | 2026, 28(1): 127-145
• LITHOFACIES PALAEOGEOGRAPHY AND SEDIMENTOLOGY •
Sedimentary facies of the Triassic Lower Karamay Formation of Xia 77 area in northwest margin of Junggar Basin
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Chao DING1, Chunming LIN2, Jun LIU1, Weihang WEI2, Guyue TAN2, Xia ZHANG2, Shuya HUANG2, Xiaolong LIU1, Zhen CHEN1, Sutian WANG1
Affiliations
  • 1 PetroChina Xinjiang Oilfield Company,Xinjiang Karamay 834000,China
  • 2 School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

    • DING Chao,born in 1982,is a senior engineer. He is mainly engaged in the comprehensive research and management of petroleum geology. E-mail: .

About Author:

DING Chao,born in 1982,is a senior engineer. He is mainly engaged in the comprehensive research and management of petroleum geology. E-mail: .

Published: 2026-02-01 doi: 10.7605/gdlxb.2026.033
Outline
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The Triassic Lower Karamay Formation(T2k1)represents the primary target for petroleum exploration in the Xia 77 area,located on the northwest margin of Junggar Basin. Integrating data from drilling,core observations,well logging,and associated analytical experiments,this study applies fundamental principles of sedimentology to analyze the sedimentary facies architecture and evolutionary characteristics of the T2k1. The findings reveal the following: (1)The formation was deposited within a shallow-water fan delta system,which is subdivided into two main subfacies: the fan delta plain and the fan delta front. The fan delta front can be further classified into inner and outer front subfacies.(2)Within the fan delta plain,three gravity flow-dominated microfacies were identified: braided channels,floodplains,and debris flows. In the fan delta inner front,two traction flow-dominated microfacies are recognized—subaqueous distributary channels and subaqueous distributary bays. The fan delta outer front is characterized by three traction flow-induced microfacies: subaqueous distributary channels,subaqueous distributary bays,and mouth bars.(3)During the depositional period of the Lower Karamay Formation,the lake basin underwent a gradual deepening,transitioning from shallow to deeper water conditions. This hydrodynamic shift resulted in a regressive sedimentary sequence in response to overall lake transgression. Laterally,the progradational-to-retrogradational evolution of the system led to a northeastward backstepping of the fan delta plain,inner front,and outer front subfacies.

fan delta  /  sedimentary facies  /  Triassic Lower Karamay Formation  /  Xia 77 area  /  Northwest margin of Junggar Basin
丁超, 林春明, 刘军, 魏维航, 谭古月, 张霞, 黄舒雅, 刘晓龙, 陈朕, 王苏天. 准噶尔盆地西北缘夏77地区三叠系克下组沉积相研究*. 古地理学报, 2026 , 28 (1) : 127 -145 . DOI: 10.7605/gdlxb.2026.033
Chao DING, Chunming LIN, Jun LIU, Weihang WEI, Guyue TAN, Xia ZHANG, Shuya HUANG, Xiaolong LIU, Zhen CHEN, Sutian WANG. Sedimentary facies of the Triassic Lower Karamay Formation of Xia 77 area in northwest margin of Junggar Basin[J]. Journal of Palaeogeography (Chinese Edition), 2026 , 28 (1) : 127 -145 . DOI: 10.7605/gdlxb.2026.033
Funding
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  • “Detailed study on the conglomerate reservoir of the Triassic Lower Karamay Formation from Xia 77 area in northwest margin of Junggar Basin”(C4-24013)
Appendix
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Year 2026 volume 28 Issue 1
180
74
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Article Info
doi: 10.7605/gdlxb.2026.033
  • Receive Date：2024-10-06
  • Online Date：2026-09-22
  • Published：2026-02-01
Article Data
Affiliations
History
  • Received：2024-10-06
  • Revised：2025-01-07
Funding
“Detailed study on the conglomerate reservoir of the Triassic Lower Karamay Formation from Xia 77 area in northwest margin of Junggar Basin”(C4-24013)
Affiliations
    1 PetroChina Xinjiang Oilfield Company,Xinjiang Karamay 834000,China
    2 School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

Corresponding:

LIN Chunming,born in 1964,is a professor and Ph.D. supervisor. He is mainly engaged in sedimentology and petroleum geology. E-mail: .
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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