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Study on the sequence stratigraphy and sedimentary facies of the Triassic in Tahe Oilfield
Pages: 11-14,6
Year: Issue:  5
Journal: Journal of Xi'an Petroleum Institute(Natural Scien

Keyword:  Tahe OilfieldTriassicsequence stratigraphysedimentary facies;
Abstract: The Triassic is a very important clastic rock stratum to the increase of the oil production of Tahe Oilfield.Based on the analyses of core and logging data,the Triassic is divided into 8 third-order sequences,and 3 types of sedimentary facies are recognized,which are braided river,lake and braided river delta.The highstand system tract is mainly braided-river delta fine sandstone,the transgressive system tract is mainly lake-facies mudstone,and the lowstand system tract is mainly coarse continental fluvial deposition.The favorable oil and gas exploration zone is in the lowstand system tract of third-grade sequences.
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