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Combining the belts of Cypridea fossils and achievements of studying the sandstone groups, we identify the four-rank sequence and its system tract through analysis lithology-electricity of logs.
主要结合介形类化石带、砂组划分研究成果，通过对钻井资料的岩性—电性、旋回及旋回成因分析，划分四级层序及四级层序的体系域。
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