Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (2): 70-74.doi: 10.3969/j.issn.1673-8926.2011.02.013

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Diagenesis of Chang 6 reservoir and its influence in Shuangcheng oil region,Hengshan area

LIU Xiuchan1， LIU Linyu1， CHEN Xipan 1，2   

  1. 1. State Key Laboratory of Continental Dynamics， Northwest University， Xi’an 710069， China； 2. Yanchang Petroleum Co. Ltd.， Yan’an 716000， China
  • Online:2011-04-20 Published:2011-04-20

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Abstract:

Chang 6 reservoir of Upper Triassic in Shuangcheng oil region is the major oil producing zone in Hengshanarea. Based on the analysis of cast slice，scanning electronic microscope and other test data, combined with sedimentary facies and pore structure, it is determined that the main diagenesis which cause the reservoir compacted are compaction and cementation. The great loss of primary pore and cement filling in intergranular residual pore are the main causes for low porosity and low permeability of the reservoir. The complex reservoir with low porosity and low permeability is dominated by the strong compaction and cementation in the early diagenesis stage. Five types of diagenetic facies are divided, which is helpful for the study on hydrocarbon distribution and enrichment.

Key words: platformmargin, reef, reservoir characteristics, buried dolomitization, Upper Permian ChangxingFormation, easten Sichuan

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