沉积盆地超压体系油气成藏条件及机理

陈中红, 天然气地球科学，2003，14（2）：97-102

摘要: 近年来的研究及勘探实践表明, 沉积盆地的超压体系与油气藏特别是深层油气藏的关系非常密切。超压体系油气藏是未来油气勘探的重要方向之一。沉积盆地超压体系具有油气成藏的特定条件和方式。超压抑制和延迟了油气的生成和成熟、改善了深部储层的储集性能、增强了对烃类的封盖作用、扩大了液态窗的范围, 为深层油气藏的勘探创造了有利条件。超压体系内油气的排放是以幕式进行的并以准封闭体系——封存箱的形式构成独立的油气成藏系统。目前, 在超压与油气生成关系方面仍然有许多有争议的看法, 和对超压体系内油气成藏机理问题的研究还不够深入。这些争议和问题都亟待解决。

关键词: 沉积盆地; 超压体系; 油气成藏; 油气生成; 幕式排放; 封存箱

中图分类号: TE12211　　　　　　　　文献标识码:A

COND ITIONS AND M ECHANISM OF HYDROCARBON ACCUM ULATION IN OVERPRESSURED SYSTEM S IN SED IM ENTARY BASINS

CHEN Zhonghong, Natural Gas Geoscience, 2003，14（2）：97-102

(U niversity of Petroleum , D ongy ing 257061, Ch ina)

Abstract: The research and practice of exp lo rat ion show that overpressure system s in sedimentary basin shave close relationship with hydrocarbon occurrence and are significant for exploration of deep reservoirs Overpressure inhibit s o r retards the genera ion and maturation of hydrocarbon and imp roves the porosity and permeability of the reservoirs1 It also strengthens the sealing for hydrocarbon and broadens the range of“liquid state window”which determines the accumulation and pooling of natural gas1 So it creates favorable condition s for the exp lo rat ion and development of reservoirs in the deep of basin Overpressure system s formes independent hydrocarbon accumulation system s as a form of compartment from which fluid releases resptitively through a cycle of healed state to fracturing state1There are still many problems to resolve, especially fo r the relation ship between overpressu re and hydrocarbon generat ion, which has been argued, and the m echan ism of hydrocarbon accumulat ion in overpressu re system s1 The issues of hydrocarbon accum u lat ion in overpressure system s w ill be importan t task s for oil o r gas exploration in future.

Key words: Sedimentary basin; Overpressure system; Hydrocarbon accumulation; Hydrocarbon genera2

t ion; Episodic expulsion; Seal compartment

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