渤海湾盆地东营凹陷沙河街组四段膏盐层及地层压力分布特征

doi:10.11743/ogg20090306

Abstract

Abstract:

Three sets of gypsolyte-salt rocks occur vertically in Es⁴(the fourth member of the Shahejie Formation) of the Dongying Sag,the Bohai Bay Basin.The gypsolyte-salt rhythmic units show apparent depositional sequence of evaporation in genesis.On plane view,the gypsolyte-salt rocks are in ring-like distribution,and salt rock,gypsolyte,argillaceous gypsolyte,carbonate,marl,and clastic rock occur successively from the center to the border of the basin.Studies based on formation pressure coefficient calculation through interval transit times and statistics of the measured pressures show that the Paleogene presents vertically a "double layer structure" with normal pressure at the upper part and abnormal high pressure at the lower part.On plane view,the distribution of the abnormal pressure matches well with that of the gypsolyt-salt-rocks.It is suggested that the gypsolyte-salt-double seal mechanism of pressure seal and physical property seal is one of the key elements controlling the formation of the abnormal pressure in Es⁴ in Dongying depression.

Key words: formation pressure, distribution characteristics, gypsolyte-salt, 4^th member of the Shahejie Formation, Dongying Sag, Bohai Bay Basin

CLC Number:

TE122.2

Liu Hui, Cao Yingchang, Jiang Zaixing, Wang Shenglan, Wang Yanzhong, Xu Lei. Distribution characteristics of evaporates and formation pressure of the fourth member of the Shahejie Formation in the Dongying Sag,the Bohai Bay Basin[J]. Oil & Gas Geology, 2009, 30(3): 287-293.

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Distribution characteristics of evaporates and formation pressure of the fourth member of the Shahejie Formation in the Dongying Sag,the Bohai Bay Basin

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