Quantitative evaluation methods for waterflooded

Authors: Fengqi Tan Hongqi Li Changfu Xu Qingyuan Li Shouchang Peng

Publish Date: 2010/11/10

Volume: 7, Issue: 4, Pages: 485-493

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Abstract

The rapid changing near source multistream depositional environment of conglomerate reservoirs leads to severe heterogeneity complex lithology and physical properties and large changes of oil layer resistivity Quantitative evaluation of waterflooded layers has become an important but difficult focus for secondary development of oilfields In this paper based on the analysis of current problems in quantitative evaluation of waterflooded layers the Kexia Group conglomerate reservoir of the Sixth District in the Karamay Oilfield was studied Eight types of conglomerate reservoir lithology were identified effectively by a data mining method combined with the data from sealed coring wells and then a multiparameter model for quantitative evaluation of the waterflooded layers of the main oilbearing lithology was developed Water production rate oil saturation and oil productivity index were selected as the characteristic parameters for quantitative evaluation of waterflooded layers of conglomerate reservoirs Finally quantitative evaluation criteria and identification rules for waterflooded layers of main oilbearing lithology formed by integration of the three characteristic parameters of waterflooded layer and undisturbed formation resistivity This method has been used in evaluation of the waterflooded layers of a conglomerate reservoir in the Karamay Oilfield and achieved good results improving the interpretation accuracy and compliance rate It will provide technical support for avoiding perforation of high waterbearing layers and for adjustment of developmental programs

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