Fluid Pressure Evolution and Accumulation Effect of the Cao 113-Zhengqi 2 Area in Dongying Sag

Abstract

Abstract:

According to the measured formation pressure and typical profile pressure distribution characteristics,we find that the overpressure occurs in the lowermiddle third Member and the fourth Member of Shahejie Formation in Dongying Sag. In vertical it is divided to three pressure systems: normal pressure, high pressure abnormal and abnormal high pressure. We analyze the paleopressure evolution using the Basin Modeling. Research shows that the overpressure evolution mainly experiences three stages：original formation, metadeclining and latestraising.Based on former analysis,overpressure is mainly caused by undercompaction, hydrocarbon generation and clay mineral transformation.The evolution of overpressure not only is well related with the hydrocarbon accumulation stages but also provides enough power.

Key words: Cao 113-Zhengqi 2 area, abnormal pressure, simulation, over pressure evolution, accumulation power

HAN Shuang-Biao, CENG Jian-Hui, SONG Xiu-Yan, LI Ji-Ting, TANG Xuan. Fluid Pressure Evolution and Accumulation Effect of the Cao 113-Zhengqi 2 Area in Dongying Sag[J]. Geoscience, 2012, 26(1): 160-167.

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