Wu Guoqiang, Zhang Lijuan, Yang Zhenzhou, Yuan Wenfang, Qi Chunyan, Ye Yu. Paleo-karstification of the Ordovician carbonate reservoirs and the relationship with fractures in the Halahatang area of Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 790-796. doi: 10.11781/sysydz201706790
Citation: Wu Guoqiang, Zhang Lijuan, Yang Zhenzhou, Yuan Wenfang, Qi Chunyan, Ye Yu. Paleo-karstification of the Ordovician carbonate reservoirs and the relationship with fractures in the Halahatang area of Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(6): 790-796. doi: 10.11781/sysydz201706790

Paleo-karstification of the Ordovician carbonate reservoirs and the relationship with fractures in the Halahatang area of Tarim Basin

doi: 10.11781/sysydz201706790
  • Received Date: 2017-08-08
  • Rev Recd Date: 2017-10-20
  • Publish Date: 2017-11-28
  • The Ordovician reservoirs in the Halahatang area of Tarim Basin are carbonate reservoirs and the storage space is karstic vugs and fractures. Types and characteristics of paleo-karstification in the Ordovician carbonate reservoirs were comprehensively analyzed by outcrop study, core observation, thin section analysis, SEM-CL spectrum and SEM-EDS analysis. Coarse-clast collapsed chaotic breccia facies, fine-clast transported chaotic breccia facies, highly disturbed strata facies and undisturbed strata facies were identified in the Xikeer outcrop by outcrop analog. Chaotic breccia related to paleo-caves was found in different formations of the Ordovician under core observation. The Ordovician reservoir experienced three types of paleo-karstification, including penecontemporaneous karstification, weathering karstification and buried karstification. Different karstic vugs demonstrated different SEM-CL spectrums. Widely developed fractures in the reservoir have a significant influence on burial karstification. On one hand, factures promoted karstification by connecting stylolite networks; on the other hand, fractures induced karstification by carrying deep hydrothermal fluids into the reservoir.

     

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