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Evolution of a hydrodynamic field and its effect on hydrocarbon accumulation in the Biyang depression, Henan province

引用

Journal of China University of Mining and Technology 2008年第4期18卷 599-605页

作者： FU Yong DONG Qing-hong BAI Zhen-rui WANG Wan-jun School of Resources and Environments Henan Polytechnic University Jiaozuo Henan 454000 China School of Resource and Earth Science China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Energy China University of Geosciences Beijing 100083 China

The hydro-geologic stages in the Biyang Depression, Henan Province, were defined and factors controlling the evolution of the hydrodynamic field in this area were analyzed. The evolution of the paleo-hydrodynamic field was studied by using the method of sedimentary-water-head and the changing patterns of the present hydrodynamic field as determined from measured pressure data. The results show that the evolution of the hydrodynamic field is one of inheritance and that it controls hydrocarbon accumulation. The deposition center in the southeast of the depression is always a high-value zone for water-head and a dynamic- source zone of the hydrodynamic field. The slope zone in the northwest of the depression is always a low-value zone for water-head and is the main discharge area for groundwater; this is the hydrocarbon accumulation zone. Hydrocarbon accumulation is controlled by the hydrodynamic field. The reservoir shows a ring-shaped horizontal pattern. Accumulation occurs in a pressure equilibrium zone at the frontal surface between sedimentary water and infiltrating water. The hydrocarbon accumulations occur in two vertically different discharge units, Eh31 and Eh32, under the action of overpressure.

关键词： Biyang depression hydrodynamic field hydrocarbon accumulation pressure equilibrium zone discharge unit

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