Abstract
According to the core observation and log facies analysis, in the stage of the sand group V of the second section of Qingshankou formation, it mainly develop the delta of type IV which was proposed by Coleman and Wright and in Daqingzi region ,the delta can be classified into two subfacies : delta front and prodelta. The delta front can be divided into underwater distributary channel, river mouth bar, offshore sandbar, coastal sand sheet, interdistributary bay and shallow lake. According to the distribution of sedimentary macrofacies, it can provide guidance to find favorable areas.
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