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Division of the Sequence Stratigraphy of the Sinian Qigebrak Formation in the Northwest Tarim Basin: Evidence from the high-resolution analysis of depositional facies and the Fischer plot
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YuanZheng WANG1, XiaoTong GE2, 3, 4, Pan TANG5, Bo YANG6, DaiZhao CHEN6, Bin WANG1, Mo DENG1, GuoWei ZHAO1
Acta Sedimentologica Sinica | 2026, 44(1) : 22 - 36
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Acta Sedimentologica Sinica | 2026, 44(1): 22-36
Division of the Sequence Stratigraphy of the Sinian Qigebrak Formation in the Northwest Tarim Basin: Evidence from the high-resolution analysis of depositional facies and the Fischer plot
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YuanZheng WANG1, XiaoTong GE2, 3, 4, Pan TANG5, Bo YANG6, DaiZhao CHEN6, Bin WANG1, Mo DENG1, GuoWei ZHAO1
Affiliations
  • 1.Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
  • 2.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development, Beijing 102206, China
  • 3.SINOPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 102206, China
  • 4.Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China
  • 5.Research Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China
  • 6.Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Published: 2026-02-10 doi: 10.14027/j.issn.1000-0550.2024.040
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Objective The Qigebrak Formation developed abundant microbial carbonates， which are the favorable target for deep to ultra-deep oil and gas exploration. However， the existing stratigraphic division scheme of the Qigebrak Formation remains controversial， hindering the analysis of reservoir depositional evolution and distribution prediction. Further in-depth research and clarification are urgently needed. Methods This study focused on the Shiairik section in the northwest Aksu area of the Tarim Basin to define the depositional environment and sea-level change， and conduct a sequence stratigraphic division of the Qigebrak Formation based on the analysis of high-precision depositional facies and the Fischer plot. Results Ten main facies are recognized from the Qigebrak Formation and grouped into a carbonate ramp platform. Two subfacies； i.e.， inner and middle ramp， are developed under this setting. The inner ramp consists of the tidal flat， lagoon， tidal channel， and grain shoals. Eight subtypes of peritidal cycles， two subtypes of shallow subtidal cycles and two subtypes of middle-ramp cycles are identified. Based on the stacking patterns reflected in the Fischer diagrams， analysis of orders of depositional facies and proportion of subtidal facies， the Qigebrak is divided into four third-order T-R sequences （SQ1-SQ4）. Among these sequences， SQ1 only records the regressive system tract in the Qigebrak Formation， whereas SQ4 only preserves the transgressive system tract. Conclusions This study suggests that （1） it is reasonable to divide the Qigebrak Formation into four sequences； （2） the top of the Qigebrak Formation could have experienced the million-year-scale exposure and erosion， which would favor the formation of scaled reservoirs.

high-resolution depositional facies  /  Fischer plot  /  Qigebrak Formation  /  northwest Tarim Basin
YuanZheng WANG, XiaoTong GE, Pan TANG, Bo YANG, DaiZhao CHEN, Bin WANG, Mo DENG, GuoWei ZHAO. Division of the Sequence Stratigraphy of the Sinian Qigebrak Formation in the Northwest Tarim Basin: Evidence from the high-resolution analysis of depositional facies and the Fischer plot[J]. Acta Sedimentologica Sinica, 2026 , 44 (1) : 22 -36 . DOI: 10.14027/j.issn.1000-0550.2024.040
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  • P23186
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Year 2026 volume 44 Issue 1
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Article Info
doi: 10.14027/j.issn.1000-0550.2024.040
  • Receive Date：2023-12-06
  • Online Date：2026-09-17
  • Published：2026-02-10
Article Data
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History
  • Received：2023-12-06
  • Revised：2024-03-25
  • Accepted：2024-04-08
Funding
P23186
Affiliations
    1.Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
    2.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development, Beijing 102206, China
    3.SINOPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 102206, China
    4.Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 102206, China
    5.Research Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China
    6.Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Corresponding:

CHEN DaiZhao, 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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