Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 60-69.doi: 10.12108/yxyqc.20250206

• PETROLEUM EXPLORATION • Previous Articles    

Genesis and geological significance of foam-spongy dolomite in the second member of Sinian Dengying Formation in Penglai-Gaomo area, central Sichuan

LI Ling1,2, DENG Yu1,2, ZHANG Xinyu3, LUO Wenjun4, ZHAO Dongfang1,2, ZENG Jianjun1,2, LIU Yun4, TAN Xiucheng1,2   

  1. 1. State Key Laboratory of Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. Key Laboratory of Carbonate Reservoir, Southwest Petroleum University, CNPC, Chengdu 610500, China;
    3. Development Division, Petrochina Southwest Oil and Gas Field Company, Chengdu 610000, China;
    4. Research Institute of Exploration and Development, Southwest Oil and Gas Field Company, Petrochina, Chengdu 610041, China
  • Received:2024-11-12 Revised:2025-01-24 Published:2025-03-06

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Abstract: In order to clarify the genetic mechanism and e geological significance of the foam-spongy dolomite of the second member of Sinian Dengying Formation（Deng2 member）in the Penglai-Gaomo area of Sichuan Basin，the petrological characteristics，carbon and oxygen isotope characteristics，trace element characteristics and rare earth partition model are analyzed by using core and thin section data combined with geochemical methods. The results shows that：（1）The foam-spongy dolomite of Deng2 member in the study area has granular foam body，and its outer wall is ringed and cemented，which reveals that its original rock is granular dolomite.（2）The foam-spongy dolomites can be divided into honeycomb and trell-shaped according to their macroscopic distribution，both of which develop at the upper or top of the high-frequency cycle. Macro and micro characteristics and geochemical analysis show that the two types of foam-spongy dolomites are affected by different degrees of atmospheric fresh water，revealing that the development of foam-spongy dolomites is controlled by karst in the early diagenetic stage，and karst strength determines the development type. The strength of honeycomb karst is relatively small，and the strength of lattice karst is relatively large.（3）The foam-spongy dolomite has undergone the diagenetic evolution process of particle deposition，submarine cementation，early cloud-forming，early atmospheric freshwater karstification and late cementation and filling，while early atmospheric freshwater karstification is useful to form ingrain solution holes（casting mold holes），karst caves，solution fractures，solution gullies of reservoir space.（4）The formation mechanism of foam-spongy dolomite is the transformation of granular original rock by dissolution，which reveals that the sedimentary facies of Deng2 member in the study area are mainly granular rock and granular beach.

Key words: foam-spongy dolomite, early diagenetic karst, Rim cementation, high frequency exposure, granular beach, the second member of Sinian Dengying Formation, Sinian, Penglai-Gaomo area, Sichuan Basin

CLC Number: 

  • TE122
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