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Study on the Features of Sedimentary Facies of Chang4+5 Pay Set of Triassic Yanchang Formation in Zhidan-Danba Area,Ordos Basin

XU Zi-ya

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Abstract

Through the observation to the cores and the classification of logging curves,and connecting with the field profiles and other geophysical data,this paper makes single-well micro-facies classification of 21 wells of Chang4+5 pay set of Triassic Yanchang Formation in Zhidan-Danba Area of Ordos Basin.The study holds that the Daba Area of Chang4+ 5 pay set is mainly the delta sedimentary system which could be subdivided into two sedimentary subfacies,delta plain facies and delta front intrafacies,laying a foundation for the prediction of favorable reservoirs.

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What this paper is about

Through the observation to the cores and the classification of logging curves,and connecting with the field profiles and other geophysical data,this paper makes single-well micro-facies classification of 21 wells of Chang4+5 pay set of Triassic Yanchang Formation in Zhidan-Danba Area of Ordos Basin.The study holds that the Daba Area of Chang4+ 5 pay set is mainly the delta sedimentary system which could be subdivided into two sedimentary subfacies,delta plain facies and delta front intrafacies,laying a foundation for the prediction of favorable reservoirs.

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Available abstract

Through the observation to the cores and the classification of logging curves,and connecting with the field profiles and other geophysical data,this paper makes single-well micro-facies classification of 21 wells of Chang4+5 pay set of Triassic Yanchang Formation in Zhidan-Danba Area of Ordos Basin.The study holds that the Daba Area of Chang4+ 5 pay set is mainly the delta sedimentary system which could be subdivided into two sedimentary subfacies,delta plain facies and delta front intrafacies,laying a foundation for the prediction of favorable reservoirs.

Key concepts: Facies, Geology, Structural basin, Sedimentary rock, Delta, Well logging, Paleontology, Petrology

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