genetic interval of strata
地层成因层段 GIS
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通过对延长统长8段厚层砂岩沉积岩石学和层序地层学研究，将其分为两类，一类是由多期单一成因的分流河道砂岩叠加构成；
The thick sandstones in Chang 8 oil Formation of Yanchang group may be divided into two types by the research on sedimentary petrology and sequence stratigraphy.
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