Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (1): 51-57.doi: 10.3969/j.issn.1673-8926.2015.01.008

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Reservoir characteristics and pore evolution of Chang 6 oil reservoir set in Qilicun Oilfield

DU Guichao1， HU Shuangquan1， SHI Lihua1， WEI Fanrong2   

  1.  1. Research Institute of Yanchang Petroleum Corporation, Xi ’ an 710075, China; 2. Qilicun Oil Production Plant ,Yanchang Oilfield Company Ltd.,Yan ’ an 717111, Shannxi,China
  • Online:2015-02-03 Published:2015-02-03

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Abstract:

Based on porosity and permeability measurements, mercury penetration, thin section analysis and SEM observations, this paper studied the reservoir characteristics and pore evolution of Chang 6 oil reservoir set of Triassic Yanchang Formation in Qilicun Oilfield, Ordos Basin. The result shows that reservoir sandstones are mainly fine grained arkose sandstone and characterized by low compositional maturity and high textural maturity. Reservoir properties of the study area show low porosity and low to extra-low permeability features. There is poor correlation between porosity and permeability, indicating strong diagenetic reformation of the reservoir sandstones. The Chang 6 reservoir is mainly in late diagenetic A stage. The main factors, influencing reservoir properties and pore evolution, are compaction, dissolution and cementation, among which compaction plays a key role in reservoir property reformation. The main cementation types include carbonate cementation, quartz overgrowth and clay mineral cementation, and they destroyed reservoir pores further. Dissolutions of feldspar, rock debris and laumontite cements widely occurred in the reservoir sandstones, and they increased the secondary pore spaces and improved the reservoir properties.

Key words: pore evolution , diagenesis , reservoir properties , YanchangFormation , Qilicun Oilfield , Ordos Basin

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