Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 36-49.doi: 10.12108/yxyqc.20200604

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Impact of authigenic clay minerals on micro-heterogeneity of deep water tight sandstone reservoirs: a case study of Triassic Chang 6 oil reservoir in Heshui area，southwestern Ordos Basin

CAO Jiangjun1, CHEN Chaobing2, LUO Jinglan1, WANG Xi2   

  1. 1. Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    2. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2020-02-10 Revised:2020-04-20 Online:2020-12-01 Published:2020-10-30

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Abstract: The intense development of authigenic clay minerals of the gravity flow reservoir in Chang 6 oil reservoir in Heshui area resulted in its complex pore throat structure,strong micro-heterogeneity,thus relatively poor physical properties. Based on the previous research results, the influence of authigenic clay minerals on the microheterogeneity of Chang 6 reservoir was studied by means of casting thin section,image grain size,scanning electron microscope,mineral X-ray diffraction,high-pressure mercury injection,physical properties and laser scanning confocal microscope. The results show that:(1)As the main product of diagenesis,authigenic clay minerals have an important influence on the micro-heterogeneity of Chang 6 oil reservoir,which is one of the major factors caused reservoir densification.(2)The authigenic clay mineral in the reservoir are mainly chlorite,illite and kaolinite. Among them,the content of chlorite is basically as same as that of kaolinite in sandy clastic flow and turbidity flow reservoirs,while illite content is higher in the turbidity flow reservoir.(3)Illite is the most important authigenic clay mineral that controls the percolation ability of the reservoir,and has an important influence on the micro-heterogeneity of the reservoir. The reservoir began to be affected by illite cementation and its heterogeneity became intense as a whole after 102 Ma.(4)Three zones can be divided at the study area based on the illite content and permeability of the reservoir. The first zone is the illite weak cementation area where the reservoir is of weak micro-heterogeneity and is mainly located in the northeastern of the study area,which is the priority exploration target area of the "sweet spot". The second zone is the illite moderate cemented area,where the reservoir is of moderate micro-heterogeneity and is mainly located in the central part of the study area,which is the secondary "sweet spot" exploration target. The third one is the illite intensively cemented zone,where the reservoir is of strong micro-heterogeneity and is mainly located in the southwestern of the study area,which is a "nonsweet spot area". The research results can provide a reference for the integrated research on the micro-heterogeneity of Chang 6 oil reservoir in Ordos Basin.

Key words: micro-heterogeneity, authigenic clay minerals, Chang 6 oil reservoir, Heshui area, Ordos Basin

CLC Number: 

  • TE122.2
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