东濮凹陷古近系含盐地层层序特征及成因分析

doi:10.11743/ogg20070406

Abstract

Abstract:

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.

Key words: salt-bearing formation, salt rhythmite, sequence composition, Dongpu depression

CLC Number:

TE112.23

Huang Jianjun, Ji Youliang, Wang Gaiwei, Chen Faliang, Han Fumin. Sequence characteristics and genesis of the Eogene salt-bearing formation in Dongpu depression[J]. Oil & Gas Geology, 2007, 28(4): 479-484.

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Sequence characteristics and genesis of the Eogene salt-bearing formation in Dongpu depression

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