超压异常对东濮凹陷深层油气成藏的控制作用

The effect of abnormal overpressure on deep reservoir formingin Dongpu depression

东濮凹陷深层超压异常十分突出,局部地区达到超高压。超压异常的形成与不均衡压实、水热增压、烃类的生成及存在较好的封闭层有关。超压异常控制了深层油气聚集,表现在对油气藏有较好的封盖作用,促进异常高孔隙的产生与保存。同时超压异常造成幕式排烃与晚期成藏特征,对深层生烃的抑制作用增加了深层资源基础。在这些认识的基础上建立了东濮凹陷深层超压流体封存箱控制的成藏模式。图5表1参6（苏玉山摘）.

Overpressure is very prominent in Dongpu depression, and in some area the geopressure is extra high. The authors of this paper hold that the mechanism of abnormal pressure is related with disequilibrium compaction, aquathermal expansion, hydrocarbon generation and better sealing strata. The abnormal overpressure has good sealing effect on reservoir, and it can promote the generation of abnormal high pores and their preservation, so it controls the accumulation of oil and gas in deep formation. It also causes episodic hydrocarbon expulsion and later reservoir forming. The restrain on hydrocarbon generation results in increase of deep resources. Based on these studies, this paper presents the reservoir-forming pattern of deep formation which controlled by overpressure-sealed box.