Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 24-32.doi: 10.12108/yxyqc.20200203

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Carbonate cementation characteristics and genetic mechanism of tight sandstone reservoirs in Longdong area,Ordos Basin

SHEN Jian   

  1. Logging Company, CNPC Great Wall Drilling Company, Beijing 100001, China
  • Received:2019-07-01 Revised:2019-08-29 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to study the carbonate cementation characteristics and its genetic mechanism in fine-grained tight sandstone reservoirs in Longdong area of Ordos Basin,thin section analysis,scanning electron microscopy and fluid inclusion test were carried out. The results show that:(1)Carbonate cements are widely developed in tight sandstones of Longdong area,Ordos Basin,with an average volume fraction of 4.2%,and are mainly composed of ferrocalcite and ankerite.(2)Most of the carbonate cements precipitate in the form of pore or enlarged edge,and the homogenization temperature of fluid inclusions is higher(the peak value is 100-110℃),and the formation stage is generally later.(3)Calcium ion sources of ferrocalcite and ankerite cements are closely related to feldspar dissolution and clay semi-permeable membrane effect in Chang 7 sandstone,while iron and magnesium ion sources are controlled by the alteration of mica and tuffaceous and the dissolution of dolomite debris and metamorphic debris.（4）The distribution of dolomite debris in clastic components controls the differential precipitation of ferrocalcite and ankerite cements in plane，and ankerite cements only occur in sandstones rich in dolomite debris.（5）Carbonate cementation is an important factor for pore loss in late tight oil sandstone. After strong compaction，the residual pores are gradually filled by carbonate cements. When the volume fraction of carbonate cements is more than 2%，the effect of cementation on reducing pore size is obvious. The research results have certain guiding significance for predicting favorable reservoir distribution in Longdong area.

Key words: dolomite debris, tight sandstone, carbonate cements, Chang 7 reservoir, Ordos Basin

CLC Number: 

  • TE122.2
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