Analysis of influencing factors of early productivity of Chang 10 reservoir in Ansai Oilfield
Online published: 2013-11-26
Based on the analysis of the early productivity distribution of Chang 10 reservoir in G52 well field of Ansai Oilfield, this paper analyzed the influence of sedimentary microfacies and diagenesis（diagenetic facies） on the early productivity. The result shows that the early productivity distribution is closely related to sedimentary microfacies. Distributarychannel has a higher earlyproductivityfor the precession ofthick sand beds, thick oil reservoirs, relatively high porosityand permeability, whereas the channel edge has a lower earlyproductivitybecause ofits opposite features against the distributary channel. The early productivity is subjected to the effect of diagenesis（diagenetic facies）. For the decline of reservoir properties, the early productivity of strong corrosion lithofacies reservoirs, corrosion lithofacies reservoirs and corrosion-chlorite cementation lithofacies reservoirs reveals the same trend. Gradual intensity of the destructive diagenesis heading southwest resulted in poor reservoir properties and thus accounts for rather lowor even noearlyproductivity.
WANG Tao , ZHAO Jinyi . Analysis of influencing factors of early productivity of Chang 10 reservoir in Ansai Oilfield[J]. Lithologic Reservoirs, 2013 , 25(6) : 20 -24 . DOI: 10.3969/j.issn.1673-8926.2013.06.004
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