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DOI: https://doi.org/10.11698/PED.20250399

Carbonate rimmed platform of the Yingshan Formation in the Gucheng area of the Tarim Basin and its implications for petroleum exploration

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  • 1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. CNPC Key Laboratory of Carbonate Reservoirs SWPU Division, Chengdu 610500, China;
    3. Xinjiang Branch of CNPC Daqing Oilfield Company, Daqing 163453, China;
    4. Exploration and Development Research Institute of CNPC Daqing Oilfield Company, Daqing 163712, China;
    5. Daqing Geophysical Research Institute of GRL, BGP INC, Daqing 163357, China

Received date: 2025-07-18

  Revised date: 2025-10-21

  Online published: 2025-11-13

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Abstract

The well deployment under the guidance of the ramp model in the Ordovician Yingshan Formation in the Gucheng area of the Tarim Basin focuses on the inner ramp in the western part of the study area, which results in a low drilling success rate and an exploration predicament. To address these issues, this study focused on reconstructing sedimentary models and the adjustment strategies for oil and gas exploration. The carbonate sedimentary model of the Yingshan Formation was re-evaluated using the data of seismic interpretation, core observations, thin-section analyses, carbon isotope composition, well logging, detrital zircon U-Pb dating, and carbonate mineral U-Pb dating. Then, the favorable sedimentary facies belts were delineated, and updated prospective exploration targets were proposed. The results demonstrate that the sedimentary model of the Yingshan Formation in the Gucheng area is characterized as a rimmed platform system, exhibiting an orderly west-to-east sedimentary sequence transition from restricted/open platform environments through the platform margin and slope settings, ultimately grading into basinal deposits. The platform margin, distinguished by thick successions of grain shoals overlain by interlayered karst zones. It is the most favorable distribution area for large-scale reservoirs. Guided by this revised sedimentary model, Well Gutan-1 was successful drilled within the outer platform margin, encountering over 90% high-energy grain shoal facies with well-developed porous and fractured-vuggy reservoirs. Through oil testing, it has successfully obtained industrial oil and gas flow. It is confirmed that the platform margin is the priority area for oil and gas exploration in the Ordovician System of the Gucheng area, thereby effectively ending the prolonged exploration stagnation in the Yingshan Formation of the Gucheng area.

Key words： carbonate platform; rimmed platform margin; high-energy grain shoal facies; Ordovician; Yingshan Formation; Gucheng area; Tarim Basin

Cite this article

ZHANG Yunfeng, ZHU Menghao, ZHANG Yuangao, PAN Wenqing, ZHANG Junlong, LI Qiang, LIU Yang, CAO Yanqing, LI Yuwei, DAI Shili, CHAI Xubing, QI Kunbo, YAN Bo . Carbonate rimmed platform of the Yingshan Formation in the Gucheng area of the Tarim Basin and its implications for petroleum exploration[J]. Petroleum Exploration and Development, 0 : 20251202 -20251202 . DOI: 10.11698/PED.20250399

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