Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1624-1636.doi: 10.13278/j.cnki.jjuese.201606103

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Diagenesis and Reservoir Quality Evolution of Low Permeability Tuffaceous Sandstones in Suderte Oilfield

Jia Zhenzhen1,2, Lin Chengyan1,2, Ren Lihua1,2, Dong Chunmei1,2, Gong Bao3   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Shandong Key Laboratory of Petroleum Reservoir, Qingdao 266580, Shandong, China;
    3. Geological Group in Eighth Oil Mining Factory of the Daqing Oil Field, Daqing 163514, Heilongjiang, China
  • Received:2016-01-02 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by National Science and Technology Special Grant(2011ZX05009-003) and 2014 Innovation Project of China University of Petroleum(YCX2014002)

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Abstract: The reservoirs in Xing'anling Group in Suderte oil field, the Hailer basin, exhibit low to ultra-low permeability and high tuffaceous content. A comprehensive study on diagenesis and quality evolution of the low permeable reservoirs was carried out utilizing cores, thin sections, SEM analysis, tested physical properties and mercury injection data. The results show that, the reservoirs are at the A period of the mesodiagenetic stage. The entire diagenetic sequences consist of compaction-early analcite cementation/early calcite cementation-feldspar dissolution/analcite dissolution/authigenic kaolinite precipitation/quartz cementation-late calcite cementation. Four types of diagenetic facies are identified as follows, strong compaction facies(I), weak compaction-medium to strong calcite cementation facies(II), medium compaction-analcite/feldspar strong dissolution facies (III), and medium compaction-analcite/feldspar medium to strong dissolution-strong kaolinite cementation facies(IV). Compaction and early calcite cementation resulted in the decrease of porosity and permeability of the reservoirs, while the dissolution of analcite and feldspar effectively improved the reservoir physical property, and the kaolinite cementation damaged the reservoir permeability. Diagenetic facies I and II have the worst reservoir quality and defined as the dense reservoirs characterized by extra-low porosity and permeability. Facies III is the best reservoir, featured by relatively high porosity and permeability, and defined as middle porosity-medium to low permeability reservoir. Facies IV developed medium reservoir quality, which is characterized by high porosity and low permeability and is defined as medium porosity and (extra) low permeability reservoir.

Key words: low permeability reservoir, diagenesis, secondary pores, diagenetic facies, reservoir quality, Hailer basin, Suderte oilfield

CLC Number: 

  • P618.13
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