南泥湾油田康台区延长组长6油层组沉积微相分析

Sedimentary Microfacies Analysis in Chang 6 of Yanchang Formation in Kangtai Area,Nanniwan Oilfield

通过岩心详细观察、常规分析化验、测井、录井资料,在南泥湾康台地区三叠系延长组主力产层长6层组中,识别出水下分流河道、河口坝、水下分流间湾、水下天然堤四种沉积微相,其中水下分流河道微像是砂岩发育的主体,其次为河口坝。河口坝主要分布于分流河道交汇部位,与水下分流河道以叠切式接触关系为主,是长6油层组砂岩储层发育的次要沉积体。

Through detailed core observation,routine analysis and log data,four sedimentary microfacies including underwater distributary channel,estuary bar,underwater distributary bay and underwater natural dike are identified in the main production layer of the Triassic Yanchang Formation in Kangtai area,Nanniwan.Among them,underwater distributary channel is the main body of sandstone,followed by estuary bar.Estuary bar mainly is distributed among the intersection of distributary channel,and its contacting with underwater distributary channel is mainly superimposed and tangential.Estuary bar is the secondary sedimentary body for sandstone reservoir development of Chang 6 oil reservoir group.