Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 29-38.doi: 10.12108/yxyqc.20210604

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Diagenesis and pore evolution of Chang 6 tight sandstone reservoir in southeastern Ordos Basin

ZHANG Yuye1,2, GAO Jianwu3, ZHAO Jingzhou1,2, ZHANG Heng3, WU Heyuan1,2, HAN Zaihua4, MAO Zhaorui1,2, YANG Xiao1,2   

  1. 1. College of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an 710065, China;
    3. Qilicun Oil Production Plant, Yanchang Oil Field Corporation, Yan'an 717100, Shaanxi, China;
    4. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2021-03-19 Revised:2021-05-21 Online:2021-12-01 Published:2021-11-25

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Abstract: There are abundant tight oil reserves in Chang 6 reservoir of Yanchang Formation in Foguyuan area of Ordos Basin, but the tight reservoir and strong heterogeneity lead to low degree of oil and gas exploration. Based on core observation and thin section analysis, the petrological characteristics and diagenesis of Chang 6 reservoir in the study area were studied by means of scanning electron microscopy, cathodoluminescence and X-ray diffraction, and quantitative reconstruction of porosity was carried out. The results show that Chang 6 reservoir is mainly composed of grayish white feldspar fine sandstone, and the reservoir space is mainly dissolved secondary pores and residual intergranular pores, which belongs to ultra-low porosity and ultra-low permeability tight sandstone reservoir. Chang 6 reservoir has entered the middle diagenetic stage A, and has undergone diagenesis such as compaction, cementation, dissolution and metasomatism, and different diagenesis has affected the pore development of the reservoir with varying degrees. Compaction destroys a large number of primary intergranular pores, which is the main factor leading to the reservoir densification in the study area. The compaction causes an average reduction in porosity of 22.76% and a porosity reduction rate of 58.40%. The cementation causes the porosity to decrease by an average of 13.57%, with a porosity reduction rate of 34.93%, of which late cementation is the key factor for reservoir compaction. Dissolution and metasomatism produce a large number of secondary pores, thereby improving the physical properties of the reservoir, and the increased porosity is 12.39% on average. The research results can provide reference for the further exploration and development of similar oilfields.

Key words: diagenesis, quantitative reconstruction of porosity, tight sandstone, Yanchang Formation, Qilicun Oilfield, Ordos Basin

CLC Number: 

  • TE122.2+1
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