Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 97-110.doi: 10.12108/yxyqc.20250509

• PETROLEUM EXPLORATION • Previous Articles    

Stratigraphy subdivision and exploration implications of Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen，Sichuan Basin

WANG Zhen1,2, WANG Xingzhi1,2, ZHU Yiqing3,4, YANG Yuran3,4, YANG Yiming3,4, KANG Jiahao1,2, HUANG Baiwen1,2, LYU Hao1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
    4. Sichuan Provincial Key Laboratory of Shale Gas Geological Evaluation and Efficient Development, Chengdu 610051, China
  • Received:2025-05-12 Revised:2025-06-10 Published:2025-09-06

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Abstract: Significant breakthroughs of shale gas exploration of Cambrian Qiongzhusi Formation in Deyang-Anyue aulacogen and its periphery of Sichuan Basin have obtained，which exhibit substantial exploration potential. Based on data of drilling core，well logging，and seismic profile，a study was conducted on subdivision and distribution characteristics of Qiongzhusi Formation，and the controlling effects of aulacogen paleogeomorphology on sedimentation was deeply analyzed.The results show that：（1）Cambrian Qiongzhusi Formation in DeyangAnyue Sichuan Basin can be divided into eight sub-layers，sub-layers 1，3，5 and 7 are dominated by mudstones， while sub-layers 2，4，6 and 8 are mainly siltstones. Each sub-layer can be accurately identified through sedimentary cycli-city，logging curve characteristics，lithology（color and composition），and biogenic features.（2）The geomorphic units（intratrough deep-water zone，intratrough slope zone，and uplift zone extratrough）within DeyangAnyue sub-layers exert decisive control on the development of Cambrian Qiongzhusi Formation. Qiong-1 Member （sub-layers 1-6）is a filling deposition controlled by a rift trough，with high-value thickness areas in both the north and south，and the sedimentation range gradually expands over time. In contrast，Qiong-2 Member（sublayers 7-8）has transformed into a widespread sedimentation，with high-value thickness areas distinctly shifted eastward.（3）The aulacogen governs the development and distribution of high-quality source rocks from Qiongzhusi Formation. Four organic-rich shale reservoirs（sub-layers 1，3，5，7）and their overlying tight argillaceous siltstone caps（sub-layers 2，4，6，8）form an effective source-reservoir-cap assemblage，with“source-reservoir inversion”accumulation model. Multiple sets of stacked source-reservoir-cap assemblages inside the aulacogen and along its margins dominated the formation of large-scale lithological oil and gas reservoirs in Sinian-Cambrian. High-quality shale reservoirs within the aulacogen and mound-shoal body lithological traps along the trough margin platform zone are the two key targets for next-phase exploration.

Key words: shale gas, isochronous stratigraphy, paleogeomorphology, source-reservoir inversion, platform moundshoal body, Deyang-Anyue aulacogen, Qiongzhusi Formation, Cambrian, Sichuan Basin

CLC Number: 

  • TE121.3
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