过渡岩类致密储层特征及测井评价

Transitional Rock Tight Reservoir Characteristics and Log Evaluation

沧东凹陷Ek_2段过渡岩类致密储层矿物成分复杂,岩性多以过渡岩类为主,储集空间复杂,有效储层识别和含油性评价困难。为有效评价该类储层,在利用系统取心井岩心分析资料分析该类储层岩性、物性、含油性、脆性特征基础上,提取反映以上储层特性敏感曲线,利用岩心刻度测井,建立一套以岩性、物性、含油性、脆性评价为核心的过渡岩类致密油储层综合评价方法。在沧东凹陷应用32口井,解释符合率达到86.4%,为该类储层储量发现作出了突出贡献。

With the significant geological discovery in well GD6X1,the transitional rocks of section Ek_2 have become more and more important as an alternative exploration reservoir in Cangdong sag.As this type of reservoirs has the following attributes:the primary rocks are transitional rocks with multi rocks,the mineral composition and pore spaces are complexity which lead to a great difficulty for identifying reservoirs and oil bearing property.In order to effectively evaluate this type of reservoirs,a comprehensive interpretive methodology of transitional rock tight reservoir is established.The key technologies of the methodology are evaluations of lithology,porosity,oil bearing and rock brittleness which are based on the relationship between core calibration log and the logs are sensitive to reservoir characteristics.These selected logs are determined on the basis of analyzing the properties of lithology,porosity,oil bearing and brittleness of the core analysis of this type of reservoirs.This methodology is applied in evaluating 32 wells of Cangdong sag,the interpretation accordant rate reaches 86.4%,which makes a great contribution to the discovery of this type of reservoir.