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《Oil & Gas Geology》 2007-04
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Sequence characteristics and genesis of the Eogene salt-bearing formation in Dongpu depression

Huang Jianjun1,Ji Youliang2,Wang Gaiwei1,Chen Faliang3,Han Fumin3(1.School of Ocean and Earth Science,Tongji University,Shanghai 200092;2.China University of Petroleum,Beijing 102249;3.Geophysical Exploration Research Institute,SINOPEC Zhongyuan Oilfield Company,Puyang,Henan 457001)  
A sequence demarcation that integrates the conventional markers of sequence boundaries and characteristics of salt rhythmite is more practical for the salt-bearing Eogene in Dongpu depression.According to this demarcation,the Eogene can be divided into 2 second-order sequences and 10 third-order sequences,ensuring the unity of salt rhythmite development and sequence growth.The saltbearing third-order sequence(low-frequency) composition displays a peculiar regularity: the horizontal distribution area of salt-bearing formation in Transgressive Systems Tract(TST) and Highstand Systems Tract(HST) is larger than that in Lowstand Systems Tract(LST).Within the high-frequency sequences,especially the subsequence units corresponding with the fifth-order sequences,salt and sandstone layers are synchronous deposits of different faces,and they form a complete unit of subsequences together with the underlying dark mudstone layers. The developing mode of high-frequency salt-bearing sequence is believed to be formed by high-stand evaporation.
【Fund】: 国家重点基础研究发展规划(973)项目(CB202302)
【CateGory Index】: P539.2
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